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52478207
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10.1007/JHEP08(2013)111
|
We revisit the computation of the two-loop light-like tetragonal Wilson loop for three dimensional pure Chern-Simons and N=6 Chern-Simons-matter theory, within dimensional regularization with dimensional reduction scheme. Our examination shows that, contrary to prior belief, the result respects maximal transcendentality as is the case of the four-point scattering amplitude of the theory. Remarkably, the corrected result matches exactly the scattering amplitude both in the divergent and in the finite parts, constants included.Fil: Bianchi, Marco S.. Humboldt-Universit¨at zu Berlin. Institut f¨ur Physik; Alemania;Fil: Giribet, Gaston Enrique. Consejo Nacional de Investigaciones Científicas y Técnicas. Oficina de Coordinación Administrativa Ciudad Universitaria. Instituto de Física de Buenos Aires; Argentina; Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales. Departamento de Física; Argentina;Fil: Leoni, Matias. Consejo Nacional de Investigaciones Científicas y Técnicas. Oficina de Coordinación Administrativa Ciudad Universitaria. Instituto de Física de Buenos Aires; Argentina; Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales. Departamento de Física; Argentina;Fil: Penati, Silvia. Universit`a degli studi di Milano–Bicocca. Dipartimento di Fisica; Italia; Istituto Nazionale di Fisica Nucleare; Italia
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Light-like Wilson loops in ABJM and maximal transcendentality
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light-like wilson loops in abjm and maximal transcendentality
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revisit tetragonal wilson chern simons chern simons regularization scheme. examination contrary belief respects maximal transcendentality theory. remarkably corrected matches divergent included.fil bianchi marco humboldt universit¨at berlin. institut f¨ur physik alemania giribet gaston enrique. consejo nacional investigaciones científicas técnicas. oficina coordinación administrativa ciudad universitaria. instituto física buenos aires argentina universidad buenos aires. facultad ciencias exactas naturales. departamento física argentina leoni matias. consejo nacional investigaciones científicas técnicas. oficina coordinación administrativa ciudad universitaria. instituto física buenos aires argentina universidad buenos aires. facultad ciencias exactas naturales. departamento física argentina penati silvia. universit degli studi milano–bicocca. dipartimento fisica italia istituto nazionale fisica nucleare italia
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non_dup
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24936473
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10.1007/JHEP08(2013)116
|
We identify the supersymmetric extension of Weyl transformations in various
types of supergravities, the minimal, nonminimal and new minimal N=1 SUGRA in
4D, formulated in terms of superfields. Based also on previous results we
conclude that there are only two types of trace anomalies in nonminimal and new
minimal supergravities, which correspond to the two nontrivial cocycles of the
minimal supergravity and, when reduced to component form, to the well-known
squared Weyl density and Euler density. There are nevertheless in new minimal
supergravity other nontrivial cocycles which, however, are mapped to zero in
the minimal supergravity.Comment: 31 pages, two references added; section 6 removed and replaced with
alternative derivatio
|
Weyl transformations and trace anomalies in N=1, D=4 supergravities
|
weyl transformations and trace anomalies in n=1, d=4 supergravities
|
supersymmetric weyl transformations supergravities nonminimal sugra formulated superfields. trace anomalies nonminimal supergravities nontrivial cocycles supergravity squared weyl euler density. nevertheless supergravity nontrivial cocycles mapped pages removed replaced derivatio
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non_dup
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[] |
24930508
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10.1007/JHEP08(2013)119
|
We investigate a dynamically generated Mott gap from holographic fermions in
asymptotically geometries with hyperscaling violation by employing a bulk
dipole coupling for the fermion field. We find that when the coupling strength
increases the spectral function first transfers to the negative frequency
region but soon redistributes to the positive region. A stable gap and two
bands emerges for all momentum when the coupling strength beyonds a critical
value. Generally, The upper band on the positive frequency axis is much sharper
than the lower band on the negative side. When the diploe coupling increases
further, the gap becomes larger and the up band still keeps sharp while the
lower band disperses and widens, concentrating on the small momentum region. We
also find that the bands will be smoothed out gradually with the increasing of
hyperscaling violation.Comment: 15 pages, 8 figures, accepted by JHE
|
Dynamic Mott gap from holographic fermions in geometries with
hyperscaling violation
|
dynamic mott gap from holographic fermions in geometries with hyperscaling violation
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dynamically mott holographic fermions asymptotically geometries hyperscaling violation employing dipole fermion field. transfers soon redistributes region. emerges beyonds value. sharper side. diploe keeps sharp disperses widens concentrating region. smoothed gradually hyperscaling pages
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non_dup
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24938248
|
10.1007/JHEP08(2013)123
|
We show renormalization group invariants in neutrino sector. These are found
from a simple analytical discussion of Majorana mass matrix for light
neutrinos. It is shown that the invariants are obtained by taking ratios among
elements of the Majorana neutrino mass matrix. The invariance is independent of
neutrino mass ordering and a parameterization of mixing matrix for the lepton
sector. Parameters in the runnings under renormalization group equations in the
neutrino sector are also analyzed.Comment: 17 pages, 10 figures, minor change
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Renormalization group invariants in neutrino sector
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renormalization group invariants in neutrino sector
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renormalization invariants sector. majorana neutrinos. invariants majorana matrix. invariance ordering parameterization lepton sector. runnings renormalization pages minor
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non_dup
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[] |
24930087
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10.1007/JHEP08(2013)124
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We study supersymmetric black holes in $AdS_4$ in the framework of four
dimensional gauged $\N=2$ supergravity coupled to hypermultiplets. We derive
the flow equations for a general electrically gauged theory where the gauge
group is Abelian and, restricting them to the fixed points, we derive the
gauged supergravity analogue of the attractor equations for theories coupled to
hypermultiplets. The particular models we analyze are consistent truncations of
M-theory on certain Sasaki-Einstein seven-manifolds. We study the space of
horizon solutions of the form $AdS_2\times \Sigma_g$ with both electric and
magnetic charges and find a four-dimensional solution space when the theory
arises from a reduction on $Q^{111}$. For other $SE_7$ reductions, the
solutions space is a subspace of this. We construct explicit examples of
spherically symmetric black holes numerically.Comment: 38 page, 4 figures; typos correcte
|
BPS Black Holes in AdS4 from M-theory
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bps black holes in ads4 from m-theory
|
supersymmetric holes gauged supergravity hypermultiplets. derive electrically gauged abelian restricting derive gauged supergravity analogue attractor hypermultiplets. analyze truncations sasaki einstein seven manifolds. horizon sigma charges arises reductions subspace this. spherically holes typos correcte
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non_dup
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[] |
16293171
|
10.1007/JHEP08(2013)125
|
In view of a potential interpretation of the role of the Mathieu group M24 in the context\ud
of strings compactied on K3 surfaces, we develop techniques to combine groups of\ud
symmetries from dierent K3 surfaces to larger `overarching' symmetry groups. We construct\ud
a bijection between the full integral homology lattice of K3 and the Niemeier lattice\ud
of type A24\ud
1 , which is simultaneously compatible with the nite symplectic automorphism\ud
groups of all Kummer surfaces lying on an appropriate path in moduli space connecting\ud
the square and the tetrahedral Kummer surfaces. The Niemeier lattice serves to express\ud
all these symplectic automorphisms as elements of the Mathieu group M24, generating the\ud
`overarching nite symmetry group' (Z2)4oA7 of Kummer surfaces. This group has order\ud
40320, thus surpassing the size of the largest nite symplectic automorphism group of a\ud
K3 surface by orders of magnitude. For every Kummer surface this group contains the\ud
group of symplectic automorphisms leaving the Kahler class invariant which is induced\ud
from the underlying torus. Our results are in line with the existence proofs of Mukai\ud
and Kondo, that nite groups of symplectic automorphisms of K3 are subgroups of one\ud
of eleven subgroups of M23, and we extend their techniques of lattice embeddings for all\ud
Kummer surfaces with Kahler class induced from the underlying torus
|
The overarching finite symmetry group of Kummer surfaces in the Mathieu group M24.
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the overarching finite symmetry group of kummer surfaces in the mathieu group m24.
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mathieu strings compactied combine symmetries dierent overarching groups. bijection homology niemeier simultaneously compatible nite symplectic automorphism kummer lying moduli connecting tetrahedral kummer surfaces. niemeier serves express symplectic automorphisms mathieu generating overarching nite kummer surfaces. surpassing nite symplectic automorphism orders magnitude. kummer symplectic automorphisms leaving kahler torus. proofs mukai kondo nite symplectic automorphisms subgroups eleven subgroups extend embeddings kummer kahler torus
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non_dup
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52675020
|
10.1007/JHEP08(2013)128
|
International audienceIn this note, we study the eigenvectors and the scalar products the integrable long-range deformation of the XXX spin chain defined in [1]. The model is solved exactly by algebraic Bethe ansatz, and it coincides in the bulk with the Inozemtsev spin chain. At the closing point it contains a defect which effectively removes the wrapping interactions. Here we concentrate on determining the defect term for the first non-trivial order in perturbation in the deformation parameter and how it affects the Bethe ansatz equations. Our study is motivated by the relation with the dilatation operator of the N = 4 gauge theory in the su(2) sector. Introduction: Long range spin chains. In this paper we consider long-range integrable deformations of the XXX spin-1/2 spin chain. There are several methods to turn a nearest-neighbor spin chain into a long-range ones. One method, used in [2, 3], is to deform the conserved charges according to d dλ Q r (λ) = i [χ(λ), Q r (λ)] , (1
|
Eigenvectors and scalar products for long range interacting spin chains II: the finite size effects
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eigenvectors and scalar products for long range interacting spin chains ii: the finite size effects
|
audiencein eigenvectors integrable deformation solved algebraic bethe ansatz coincides inozemtsev chain. closing defect effectively removes wrapping interactions. concentrate determining defect trivial perturbation deformation affects bethe ansatz equations. motivated dilatation sector. chains. integrable deformations chain. nearest neighbor ones. deform conserved charges
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non_dup
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[] |
24935507
|
10.1007/JHEP08(2013)129
|
We propose a new method to measure various physical parameters, using
characteristic weight functions. This method requires only lepton energy
distribution and ideally it does not depend on the velocity of the parent
particle. We demonstrate an application of this method by simulating a
reconstruction of the Higgs boson mass in the H-> WW -> lnu lnu decay mode at
the LHC. We show that systematic errors are suppressed compared to statistical
errors. In the vector boson fusion channel, the statistical accuracy of the
mass determination is estimated to be +12% and -14% at an integrated luminosity
of 100fb^{-1}, assuming the Higgs boson mass to be 125GeV and root{s}=14TeV.Comment: 31 pages, 15 figures; Version to appear in JHE
|
Measurement of physical parameters with a weight function method and its
application to the Higgs boson mass reconstruction
|
measurement of physical parameters with a weight function method and its application to the higgs boson mass reconstruction
|
propose functions. lepton ideally parent particle. simulating reconstruction boson lhc. suppressed errors. boson fusion luminosity boson pages
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non_dup
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[] |
24936574
|
10.1007/JHEP08(2013)132
|
We present a new calculation of the K->pi semileptonic form factor at zero
momentum transfer in domain wall lattice QCD with Nf=2+1 dynamical quark
flavours. By using partially twisted boundary conditions we simulate directly
at the phenomenologically relevant point of zero momentum transfer. We perform
a joint analysis for all available ensembles which include three different
lattice spacings (a=0.09-0.14fm), large physical volumes (m_pi*L>3.9) and pion
masses as low as 171 MeV. The comprehensive set of simulation points allows for
a detailed study of systematic effects leading to the prediction
f+(0)=0.9670(20)(+18/-46), where the first error is statistical and the second
error systematic. The result allows us to extract the CKM-matrix element
|Vus|=0.2237(+13/-8) and confirm first-row CKM-unitarity in the Standard Model
at the sub per mille level.Comment: 16 apges, 5 figure
|
The kaon semileptonic form factor with near physical domain wall quarks
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the kaon semileptonic form factor with near physical domain wall quarks
|
semileptonic flavours. partially twisted simulate phenomenologically transfer. ensembles spacings volumes pion mev. comprehensive systematic. extract confirm unitarity mille apges
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non_dup
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[] |
19597520
|
10.1007/JHEP08(2013)133
|
The three-loop four-point function of stress-tensor multiplets in N = 4 super\ud
Yang-Mills theory contains two so far unknown, off-shell, conformal integrals, in addition\ud
to the known, ladder-type integrals. In this paper we evaluate the unknown integrals, thus\ud
obtaining the three-loop correlation function analytically. The integrals have the generic\ud
structure of rational functions multiplied by (multiple) polylogarithms. We use the idea of\ud
leading singularities to obtain the rational coefficients, the symbol — with an appropriate\ud
ansatz for its structure — as a means of characterising multiple polylogarithms, and the\ud
technique of asymptotic expansion of Feynman integrals to obtain the integrals in certain\ud
limits. The limiting behaviour uniquely fixes the symbols of the integrals, which we then\ud
lift to find the corresponding polylogarithmic functions. The final formulae are numerically\ud
confirmed. The techniques we develop can be applied more generally, and we illustrate this\ud
by analytically evaluating one of the integrals contributing to the same four-point function\ud
at four loops. This example shows a connection between the leading singularities and the\ud
entries of the symbol
|
Leading singularities and off-shell conformal integrals.
|
leading singularities and off-shell conformal integrals.
|
multiplets super mills unknown conformal integrals ladder integrals. unknown integrals obtaining analytically. integrals generic rational multiplied polylogarithms. singularities rational symbol ansatz characterising polylogarithms asymptotic feynman integrals integrals limits. limiting uniquely fixes symbols integrals lift polylogarithmic functions. formulae numerically confirmed. illustrate analytically evaluating integrals contributing loops. connection singularities entries symbol
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non_dup
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24940811
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10.1007/JHEP08(2013)134
|
We study conformal field theory with the symmetry algebra
$\mathcal{A}(2,p)=\hat{\mathfrak{gl}}(n)_{2}/\hat{\mathfrak{gl}}(n-p)_2$. In
order to support the conjecture that this algebra acts on the moduli space of
instantons on $\mathbb{C}^{2}/\mathbb{Z}_{p}$, we calculate the characters of
its representations and check their coincidence with the generating functions
of the fixed points of the moduli space of instantons.
We show that the algebra $\mathcal{A}(2,p)$ can be realized in two ways. The
first realization is connected with the cross-product of $p$ Virasoro and $p$
Heisenberg algebras: $\mathcal{H}^{p}\times \textrm{Vir}^{p}$. The second
realization is connected with: $\mathcal{H}^{p}\times
\hat{\mathfrak{sl}}(p)_2\times (\hat{\mathfrak{sl}}(2)_p \times
\hat{\mathfrak{sl}}(2)_{n-p}/\hat{\mathfrak{sl}}(2)_n)$. The equivalence of
these two realizations provides the non-trivial identity for the characters of
$\mathcal{A}(2,p)$.
The moduli space of instantons on $\mathbb{C}^{2}/\mathbb{Z}_{p}$ admits two
different compactifications. This leads to two different bases for the
representations of $\mathcal{A}(2,p)$. We use this fact to explain the
existence of two forms of the instanton pure partition functions.Comment: 23 pages, 1 figur
|
Coset conformal field theory and instanton counting on C^2/Z_p
|
coset conformal field theory and instanton counting on c^2/z_p
|
conformal mathcal mathfrak mathfrak conjecture acts moduli instantons mathbb mathbb characters representations check coincidence generating moduli instantons. mathcal realized ways. realization virasoro heisenberg algebras mathcal textrm realization mathcal mathfrak mathfrak mathfrak mathfrak equivalence realizations trivial characters mathcal moduli instantons mathbb mathbb admits compactifications. bases representations mathcal instanton partition pages figur
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non_dup
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24800530
|
10.1007/JHEP08(2013)136
|
We introduce a search technique that is sensitive to a broad class of signals
with large final state multiplicities. Events are clustered into large radius
jets and jet substructure techniques are used to count the number of subjets
within each jet. The search consists of a cut on the total number of subjets in
the event as well as the summed jet mass and missing energy. Two different
techniques for counting subjets are described and expected sensitivities are
presented for eight benchmark signals. These signals exhibit diverse
phenomenology, including 2-step cascade decays, direct three body decays, and
multi-top final states. We find improved sensitivity to these signals as
compared to previous high multiplicity searches as well as a reduced reliance
on missing energy requirements. One benefit of this approach is that it allows
for natural data driven estimates of the QCD background.Comment: 36 pages, 12 Figures, 5 Tables; journal versio
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Learning How to Count: A High Multiplicity Search for the LHC
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learning how to count: a high multiplicity search for the lhc
|
broad multiplicities. clustered jets substructure count subjets jet. subjets summed missing energy. counting subjets sensitivities eight benchmark signals. exhibit diverse phenomenology cascade decays decays states. multiplicity searches reliance missing requirements. benefit pages tables versio
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non_dup
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[] |
24950691
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10.1007/JHEP08(2013)139
|
It is known that time-dependent perturbations can enhance superconductivity
and increase the critical temperature. If this phenomenon happens to high-T_c
superconductors, one could obtain room-temperature superconductors, but this is
still an open issue experimentally. Meanwhile, we would like to understand this
phenomenon from gravity dual and see if the enhancement is possible for
holographic superconductors. Previous work (arXiv:1104.4098 [hep-th]) has
studied this issue by adding a "time-dependent chemical potential," but their
analysis is questionable as a true dynamic equilibrium. In particular, the AdS
boundary does not supply energy to the bulk spacetime in their setup. A more
appropriate way to discuss the enhancement is to add a time-dependent vector
potential, i.e., a time-dependent electric field. However, the enhancement does
not occur for holographic superconductors.Comment: 26 pages, 3 figures, JHEP; v2: added comment in Sec. 4.3 to the
published version (v1
|
The enhanced holographic superconductor: is it possible?
|
the enhanced holographic superconductor: is it possible?
|
perturbations enhance superconductivity temperature. phenomenon happens superconductors room superconductors experimentally. meanwhile phenomenon enhancement holographic superconductors. adding questionable equilibrium. supply spacetime setup. enhancement i.e. field. enhancement holographic pages jhep comment sec.
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non_dup
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25026802
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10.1007/JHEP08(2014)011
|
We investigate in detail the mechanism of superradiance to render the
instability of Kerr-de Sitter black holes in scalar-tensor gravity. Our results
provide more clues to examine the scalar-tensor gravity in the astrophysical
black holes in the universe with cosmological constant. We also discuss the
spontaneous scalarization in the de Sitter background and find that this
instability can also happen in the spherical de Sitter configuration in a
special style.Comment: (v2)21 pages, 21 figures; Sec. V revised; This version has been
accepted for publication by JHE
|
Superradiant instability of Kerr-de Sitter black holes in scalar-tensor
theory
|
superradiant instability of kerr-de sitter black holes in scalar-tensor theory
|
superradiance render instability kerr sitter holes gravity. clues examine astrophysical holes universe cosmological constant. spontaneous scalarization sitter instability happen spherical sitter pages sec. revised publication
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non_dup
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24967930
|
10.1007/JHEP08(2014)014
|
We investigate the connection between R-parity violation (RPV) in
supersymmetric models and Baryogenesis. First we discuss in detail the
assumptions of a theorem by Nanopoulos and Weinberg on the CP asymmetry
generated from the decay of massive particles. In light of this statement, we
analyse some interesting models of Baryogenesis through RPV. We then explore,
in the context of RPV SUSY, the possibility to generate the baryon asymmetry
through the out-of-equilibrium decay of a metastable Weakly Interacting Massive
Particle (WIMP), as proposed in \cite{Cui:2012jh}. This setting is also
motivated by the observed coincidence between the abundances of dark and
baryonic matter. In this framework, we propose two models of out-of-equilibrium
decay of a would-be cold relic, and compute the associated CP asymmetry. With a
TeV-scale parent, the observed baryon abundance can be reproduced in these
models when the stop is in the multi-TeV region. Furthermore, annihilation of
the metastable particle into SM states must be characterised by a very weak
coupling, $g\sim 10^{-2}$ and by a heavy mediator $m_{med}\sim 10$ TeV. These
models can also accommodate stop masses far from the TeV scale, at the expense
of weakening the explanation of the $\Omega_{B}-\Omega_{DM}$ coincidence.Comment: 31 pages, 12 figures. Revised version according to JHEP requirements:
quantitative analyses added in Sec. 4, extended and revised list of refs,
abstract and conclusions clarifie
|
Weak Scale Baryogenesis in a Supersymmetric Scenario with R-parity
violation
|
weak scale baryogenesis in a supersymmetric scenario with r-parity violation
|
connection parity violation supersymmetric baryogenesis. assumptions nanopoulos weinberg asymmetry massive particles. statement analyse baryogenesis rpv. explore susy baryon asymmetry metastable weakly interacting massive wimp cite motivated coincidence abundances baryonic matter. propose cold relic asymmetry. parent baryon abundance reproduced stop region. annihilation metastable characterised mediator tev. accommodate stop expense weakening explanation omega omega pages figures. revised jhep sec. revised refs clarifie
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non_dup
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35082978
|
10.1007/JHEP08(2014)015
|
The Triplet extension of the MSSM (TMSSM) alleviates the little hierarchy problem and provides a significant enhancement of the loop-induced diphoton rate of the lightest CP-even Higgs h . In this paper we pursue the analysis of the TMSSM Higgs phenomenology by computing for the first time the h → Z γ decay. Interestingly we find that the rates of loop-induced decays are correlated and their signal strengths can rise up to 40%-60% depending on the channel. We furthermore study the dark matter phenomenology of the TMSSM. The lightest neutralino is a good dark matter candidate in two regions. The first one is related to the Higgs and Z resonances and the LSP is mostly Bino. The second one is achieved for a mass larger than 90 GeV and the LSP behaves as the well-tempered neutralino. An advantage of the triplet contribution is that the well-tempered neutralino can be a Bino-Triplino mixture, relieving the problem of achieving M 2 ~ M 1 in unified scenarios. The dark matter constraints strongly affect the Higgs phenomenology, reducing the potential enhancements of the diphoton and of the Z γ channels by 20% at most. In the near future, dark matter direct searches and collider experiments will probe most of the parameter space where the neutralino is the dark matter candidate
|
Dark matter versus h → γγ and h → γ Z with supersymmetric triplets
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dark matter versus h → γγ and h → γ z with supersymmetric triplets
|
triplet mssm tmssm alleviates hierarchy enhancement diphoton lightest pursue tmssm phenomenology decay. interestingly decays strengths channel. phenomenology tmssm. lightest neutralino candidate regions. resonances mostly bino. behaves tempered neutralino. advantage triplet tempered neutralino bino triplino mixture relieving achieving unified scenarios. phenomenology reducing enhancements diphoton most. searches collider neutralino candidate
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non_dup
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35083040
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10.1007/JHEP08(2014)027
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There has been recent interest in the question of whether four dimensional scale invariant unitary quantum field theories are actually conformally invariant. In this note we present a complete analysis of possible scale anomalies in correlation functions of the trace of the stress-energy tensor in such theories. We find that 2-, 3- and 4-point functions have a non-trivial anomaly while connected higher point functions are non-anomalous. We pay special attention to semi-local contributions to correlators (terms with support on a set containing both coincident and separated points) and show that the anomalies in 3- and 4-point functions can be accounted for by such contributions. We discuss the implications of the our results for the question of scale versus conformal invariance
|
Comments on scale and conformal invariance
|
comments on scale and conformal invariance
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unitary conformally invariant. anomalies trace theories. trivial anomaly anomalous. correlators coincident separated anomalies accounted contributions. conformal invariance
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non_dup
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33617372
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10.1007/JHEP08(2014)035
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We present the computation of the double real and real-virtual contributions to top-antitop pair production in the quark-antiquark channel at leading colour. The TeX → TeX amplitudes contributing to the real-virtual part are computed with OpenLoops, and their numerical stability in the soft and collinear regions is found to be sufficiently high to perform a realistic NNLO calculation in double precision. The subtraction terms required at real-real and real-virtual levels are constructed within the antenna subtraction formalism extended to deal with the presence of coloured massive final state particles. We show that those subtraction terms approximate the real-real and real-virtual matrix elements in all their singular limits
|
NNLO QCD subtraction for top-antitop production in the $q\bar{q}$ channel
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nnlo qcd subtraction for top-antitop production in the $q\bar{q}$ channel
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virtual antitop antiquark colour. amplitudes contributing virtual openloops collinear sufficiently realistic nnlo precision. subtraction virtual antenna subtraction formalism deal coloured massive particles. subtraction approximate virtual singular
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non_dup
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35082986
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10.1007/JHEP08(2014)044
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We present a new one-parameter family of supersymmetric solutions deforming AdS 5 . This is constructed as an asymptotically locally anti de Sitter (AlAdS) solution of five-dimensional minimal gauged supergravity, with topology ℝ × ℝ 4 and a non-trivial graviphoton field, and can be uplifted to ten or eleven dimensional supergravities. An analytic continuation of this solution yields the gravity dual to a class of four-dimensional N = 1 $$ \mathcal{N}=1 $$ supersymmetric gauge theories on a curved manifold with topology S 1 × S 3 , comprising an SU(2) × U(1)-symmetric squashed three-sphere, with a non-trivial background gauge field coupling to the R-symmetry current. We compute the holographically renormalised on-shell action and interpret it in terms of the Casimir energy of the dual field theory. We also determine the holographic conserved charges of the solution and discuss relations between them
|
The gravity dual of supersymmetric gauge theories on a squashed S 1 × S 3
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the gravity dual of supersymmetric gauge theories on a squashed s 1 × s 3
|
supersymmetric deforming asymptotically locally sitter alads gauged supergravity topology trivial graviphoton uplifted eleven supergravities. analytic continuation mathcal supersymmetric curved manifold topology comprising squashed sphere trivial current. holographically renormalised interpret casimir theory. holographic conserved charges
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non_dup
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[] |
35083008
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10.1007/JHEP08(2014)052
|
We consider a broad class of inflationary models that arise naturally in super-gravity. They are defined in terms of a parameter α that determines the curvature and cutoff of these models. As a function of this parameter, we exhibit that the inflationary predictions generically interpolate between two attractor points. At small cutoff α , the resulting inflationary model is of plateau-type with n s = 1 − 2 /N and r = 12 α/N 2 . For α = 1, these predictions coincide with predictions of the Starobinsky model and Higgs inflation. In contrast, for large cutoff α , the theory asymptotes to quadratic inflation, with n s = 1 − 2 /N , r = 8 /N . Both universal predictions can be attributed to a stretching of the moduli space. For intermediate values of α , the predictions interpolate between these two critical points, thus covering the sweet spots of both Planck and BICEP2
|
Large field inflation and double α -attractors
|
large field inflation and double α -attractors
|
broad inflationary arise naturally super gravity. determines curvature cutoff models. exhibit inflationary generically interpolate attractor points. cutoff inflationary plateau coincide starobinsky inflation. cutoff asymptotes quadratic inflation universal attributed stretching moduli space. interpolate covering sweet spots planck bicep
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non_dup
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[] |
25035138
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10.1007/JHEP08(2014)062
|
We investigate the behavior of superstring disk scattering amplitudes in the
presence of a soft external momentum at finite string tension. We prove that
there are no $\alpha'$-corrections to the field theory form of the subleading
soft factor $S^{(1)}$. At the end of this work, we also comment on the
possibility to find the corresponding subleading soft factors in closed string
theory using our result and the KLT relations.Comment: 15 pages, v2: minor changes, new references, version accepted by JHE
|
Subleading Soft Factor for String Disk Amplitudes
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subleading soft factor for string disk amplitudes
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superstring amplitudes tension. alpha subleading comment subleading pages minor
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non_dup
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[] |
25028850
|
10.1007/JHEP08(2014)069
|
We present the computation of the differential cross section for the process
$pp(\bar{p}) \to (W^+\,W^-\,b\,\bar{b}
\to)\;e^+\,\nu_e\,\mu^-\,\bar{\nu}_\mu\,b\, \bar{b}+X$ at NLO QCD accuracy
matched to Shower Monte Carlo (SMC) simulations using PowHel, on the basis of
the interface between HELAC-NLO and POWHEG-BOX. We include all resonant and
non-resonant contributions. This is achieved by fully taking into account the
effect of off-shell t-quarks and off-shell W-bosons in the complex mass scheme.
We also present a program called DECAYER that can be used to let the t-quarks
present in the event files for $pp(\bar{p}) \to {t\,\bar{t}\,X}$ processes
decay including both the finite width of the t-quarks and spin correlations. We
present predictions for both the Tevatron and the LHC, with emphasis on
differences emerging from three different $W^+\,W^-\,b\,\bar{b}$
hadroproduction computations: (i) full implementation of the $p\,p(\bar{p}) \to
W^+\,W^-\,b\,\bar{b}$ process, (ii) generating on-shell t-quarks pushed
off-shell with a Breit-Wigner finite width and decayed by DECAYER, and (iii)
on-shell t-quark production followed by decay in the narrow width
approximation, as described by the SMC.Comment: 40 pages, 26 figures; slightly expanded version matching the one
published in JHE
|
Hadroproduction of $W^+ W^- b \bar{b}$ at NLO accuracy matched with
shower Monte Carlo programs
|
hadroproduction of $w^+ w^- b \bar{b}$ at nlo accuracy matched with shower monte carlo programs
|
matched shower monte carlo powhel helac powheg box. resonant resonant contributions. quarks bosons scheme. decayer quarks files quarks correlations. tevatron emphasis emerging hadroproduction computations generating quarks pushed breit wigner decayed decayer narrow pages expanded matching
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non_dup
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35082958
|
10.1007/JHEP08(2014)076
|
The graviton propagation in an asymmetric background is studied. The background is a configuration in the six-dimensional Salam-Sezgin model, in which a 3-form H-field turned on [ JHEP 0910 (2009) 086]. The compact dimensions form a cylindrical space with branes as boundaries. The background gets asymmetry due to the H-field and violates the Lorentz symmetry. We derive the graviton equation in this background and show that it gets massless mode traveling with superluminal speed. A tower of K-K modes exists with a mass gap. On the other hand, it is known that breaking the Lorentz symmetry on an asymmetric background is constrained by the null energy condition. This no-go theorem doesn’t work well in six-dimensional space-times and by this model we provide a counterexample for which the null energy condition is satisfied while the Lorentz symmetry is gravitationally violated
|
Graviton propagation in an asymmetric warped background: Lorentz violation and the null energy condition
|
graviton propagation in an asymmetric warped background: lorentz violation and the null energy condition
|
graviton propagation asymmetric studied. salam sezgin turned jhep cylindrical branes boundaries. gets asymmetry violates lorentz symmetry. derive graviton gets massless traveling superluminal speed. tower gap. breaking lorentz asymmetric constrained condition. doesn’t counterexample satisfied lorentz gravitationally violated
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non_dup
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25033311
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10.1007/JHEP08(2014)084
|
For the N=2 Kazama-Suzuki models that appear in the duality with a higher
spin theory on AdS_3 it is shown that the large level limit can be interpreted
as a continuous orbifold of 2N free bosons and fermions by the group U(N). In
particular, we show that the subset of coset representations that correspond to
the perturbative higher spin degrees of freedom are precisely described by the
untwisted sector of this U(N) orbifold. We furthermore identify the twisted
sector ground states of the orbifold with specific coset representations, and
give various pieces of evidence in favour of this identification.Comment: 24 pages, v2: minor correction
|
The Continuous Orbifold of N=2 Minimal Model Holography
|
the continuous orbifold of n=2 minimal model holography
|
kazama suzuki duality interpreted orbifold bosons fermions coset representations perturbative freedom precisely untwisted orbifold. twisted orbifold coset representations pieces favour pages minor
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non_dup
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25022532
|
10.1007/JHEP08(2014)087
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We demonstrate that Appell-Lerch sums with higher order poles as well as
their modular covariant completions arise as partition functions in the cigar
conformal field theory with worldsheet supersymmetry. The modular covariant
derivatives of the elliptic genus of the cigar give rise to operator insertions
corresponding to (powers of) right-moving momentum, left-moving fermion number,
as well as a term corresponding to an ordinary zero mode partition sum. To show
this, we demonstrate how the right-moving supersymmetric quantum mechanics (and
in particular the Hamiltonian and spectral density) depend on the imaginary
part of the chemical potential for angular momentum. As a consequence of our
analysis we find that varying the imaginary part of the chemical potential for
angular momentum on the cigar gives rise to a wall-crossing phenomenon in the
bound state contribution to the elliptic genus, while the full elliptic genus
is a continuous function of the chemical potential.Comment: 29 page
|
Higher Poles and Crossing Phenomena from Twisted Genera
|
higher poles and crossing phenomena from twisted genera
|
appell lerch sums poles modular covariant completions arise partition cigar conformal worldsheet supersymmetry. modular covariant derivatives elliptic genus cigar insertions powers moving moving fermion ordinary partition sum. moving supersymmetric mechanics imaginary momentum. imaginary cigar crossing phenomenon elliptic genus elliptic genus
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non_dup
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[] |
25034405
|
10.1007/JHEP08(2014)088
|
The low-energy and low-momentum dynamics of systems with a spontaneously
broken continuous symmetry is dominated by the ensuing Nambu-Goldstone bosons.
It can be conveniently encoded in a model-independent effective field theory
whose structure is fixed by symmetry up to a set of effective coupling
constants. We construct the most general effective Lagrangian for the
Nambu-Goldstone bosons of spontaneously broken global internal symmetry up to
the fourth order in derivatives. Rotational invariance and spatial
dimensionality of one, two or three are assumed in order to obtain compact
explicit expressions, but our method is completely general and can be applied
without modifications to condensed matter systems with a discrete space group
as well as to higher-dimensional theories. The general low-energy effective
Lagrangian for relativistic systems follows as a special case. We also discuss
the effects of explicit symmetry breaking and classify the corresponding terms
in the Lagrangian. Diverse examples are worked out in order to make the results
accessible to a wide theoretical physics community.Comment: 45 page
|
Effective Lagrangians for quantum many-body systems
|
effective lagrangians for quantum many-body systems
|
spontaneously broken dominated ensuing nambu goldstone bosons. conveniently encoded constants. lagrangian nambu goldstone bosons spontaneously broken fourth derivatives. rotational invariance dimensionality expressions modifications condensed theories. lagrangian relativistic case. breaking classify lagrangian. diverse worked accessible
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non_dup
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25002792
|
10.1007/JHEP08(2014)089
|
We suggest the modified matching procedure for TMD PDF to the integrated PDF
aimed to increase the amount of perturbative information in the TMD PDF
expression. The procedure consists in the selection and usage of the
non-minimal operator basis, which restricts the expansion to desired general
behavior. The implication of OPE allows to systematic account of the higher
order corrections. In the case of TMD PDF we assume the Gaussian behavior,
which suggests Laguerre polynomial basis as the best for the convergence of
OPE. We present the leading and next-to-leading expression of TMD PDF in this
basis. The obtained perturbative expression for the TMD PDF is valid in the
wide region of $b_T$ (we estimate this region as $b_T\lesssim 2-3$ GeV$^{-1}$
depending on $x$).Comment: 19 pages, 6 figures; corrected abstract, conclusion and various
misprints; version submitted to JHE
|
TMD PDFs in the Laguerre polynomial basis
|
tmd pdfs in the laguerre polynomial basis
|
matching aimed perturbative expression. usage restricts desired behavior. implication corrections. laguerre ope. basis. perturbative valid lesssim .comment pages corrected misprints submitted
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non_dup
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25021514
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10.1007/JHEP08(2014)090
|
Recent data on the high-pT pion nuclear modification factor, $R_{AA}(p_T)$,
and its elliptic azimuthal asymmetry, $v_2(p_T)$, from RHIC/BNL and LHC/CERN
are analyzed in terms of a wide class of jet-energy loss models coupled to
different (2+1)d transverse plus Bjorken expanding hydrodynamic fields. We test
the consistency of each model by demanding a simultaneous account of the
azimuthal, the transverse momentum, and the centrality dependence of the data
at both 0.2 and 2.76 ATeV energies. We find a rather broad class of jet-energy
independent energy-loss models $dE/dx= \kappa(T) x^z T^{2+z} \zeta_q$ that,
when coupled to bulk constrained temperature fields T(x,t), can account for the
current data at the $\chi^2<2$ level with different temperature-dependent
jet-medium couplings and path-length dependence exponents $0\le z \le 2$. We
test the sensitivity of predictions to different skewed energy-loss
fluctuations via a convenient scaling factor distributed in a finite range $0<
\zeta_q < 2+q$ with unit mean. While a previously proposed AdS/CFT jet-energy
loss model with a temperature-independent jet-medium coupling as well as a
near-$T_c$ dominated, pQCD-inspired energy-loss scenario are shown to be
inconsistent with the LHC data, once the parameters are constrained by fitting
to RHIC results, we find several new solutions with a temperature-dependent
jet-medium coupling. We conclude that the current level of statistical and
systematic uncertainties of the measured data does not allow a constraint on
the path-length exponent z to a range narrower than [0-2].Comment: 23 pages, 13 figues, 3 tables; figures 4 and 9 corrected, main
conclusions remain unchange
|
Constraints on the Path-Length Dependence of Jet Quenching in Nuclear
Collisions at RHIC and LHC
|
constraints on the path-length dependence of jet quenching in nuclear collisions at rhic and lhc
|
pion modification elliptic azimuthal asymmetry rhic cern bjorken expanding hydrodynamic fields. consistency demanding simultaneous azimuthal centrality atev energies. broad kappa zeta constrained couplings exponents skewed convenient zeta mean. dominated pqcd inspired inconsistent constrained fitting rhic coupling. exponent narrower .comment pages figues tables corrected unchange
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non_dup
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25009394
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10.1007/JHEP08(2014)094
|
Motivated by an analogous result for K3 models, we classify all groups of
symmetries of non-linear sigma models on a torus T^4 that preserve the N=(4,4)
superconformal algebra. The resulting symmetry groups are isomorphic to certain
subgroups of the Weyl group of E8, that plays a role similar to the Conway
group for the case of K3 models. Our analysis heavily relies on the triality
automorphism of the T-duality group SO(4,4,Z). As a byproduct of our results,
we discover new explicit descriptions of K3 models as asymmetric orbifolds of
torus CFTs.Comment: 42 pages; minor changes, references added; version accepted for
publicatio
|
On symmetries of N=(4,4) sigma models on T^4
|
on symmetries of n=(4,4) sigma models on t^4
|
motivated analogous classify symmetries sigma torus preserve superconformal algebra. isomorphic subgroups weyl plays conway models. heavily relies triality automorphism duality byproduct discover descriptions asymmetric orbifolds torus pages minor publicatio
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non_dup
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25021853
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10.1007/JHEP08(2014)096
|
The effective diagram technique based on the Schwinger-Dyson equations is
constructed for N=1 SQED with N_f flavors, regularized by higher derivatives.
Using these effective diagrams, it is possible to derive the exact NSVZ
relation between the beta-function and the anomalous dimension of the matter
superfields exactly in all loops, if the renormalization group functions are
defined in terms of the bare coupling constant. In particular, we verify that
all integrals which give the beta-function defined in terms of the bare
coupling constant are integrals of double total derivatives and prove some
identities relating Green functions.Comment: 70 pages, 24 figures; v2: a reference adde
|
The NSVZ beta-function and the Schwinger-Dyson equations for N=1 SQED
with N_f flavors, regularized by higher derivatives
|
the nsvz beta-function and the schwinger-dyson equations for n=1 sqed with n_f flavors, regularized by higher derivatives
|
schwinger dyson sqed flavors regularized derivatives. diagrams derive nsvz beta anomalous superfields loops renormalization bare constant. verify integrals beta bare integrals derivatives identities relating pages adde
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non_dup
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[] |
35082809
|
10.1007/JHEP08(2014)097
|
Continuing the program initiated in arXiv:1304.1798 we investigate unitarity methods applied to two-dimensional integrable field theories. The one-loop computation is generalized to encompass theories with different masses in the asymptotic spectrum and external leg corrections. Additionally, the prescription for working with potentially singular cuts is modified to cope with an ambiguity that was not encountered before. The resulting methods are then applied to three light-cone gauge string theories; i) AdS 3 × S 3 × T 4 supported by RR flux, ii) AdS 3 × S 3 × S 3 × S 1 supported by RR flux and iii) AdS 3 × S 3 × T 4 supported by a mix of RR and NSNS fluxes. In the first case we find agreement with the exact result following from symmetry considerations and in the second case with one-loop semiclassical computations. This agreement crucially includes the rational terms and hence supports the conjecture that S-matrices of integrable field theories are cut-constructible, up to a possible shift in the coupling. In the final case, under the assumption that our methods continue to give all rational terms, we give a conjecture for the one-loop phases
|
AdS 3 × S 3 × M 4 string S-matrices from unitarity cuts
|
ads 3 × s 3 × m 4 string s-matrices from unitarity cuts
|
continuing initiated unitarity integrable theories. encompass asymptotic corrections. additionally prescription potentially singular cuts cope ambiguity encountered before. cone nsns fluxes. considerations semiclassical computations. crucially rational supports conjecture integrable constructible coupling. continue rational conjecture
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non_dup
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35081429
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10.1007/JHEP08(2014)112
|
We formulate a deformation of Rozansky-Witten theory analogous to the Ω-deformation. It is applicable when the target space X is hyperkähler and the spacetime is of the form ℝ×Σ, with Σ being a Riemann surface. In the case that Σ is a disk, the Ω-deformed Rozansky-Witten theory quantizes a symplectic submanifold of X , thereby providing a new perspective on quantization. As applications, we elucidate two phenomena in four- dimensional gauge theory from this point of view. One is a correspondence between the Ω-deformation and quantization of integrable systems. The other concerns supersymmetric loop operators and quantization of the algebra of holomorphic functions on a hyperkähler manifold
|
Ω-deformation and quantization
|
ω-deformation and quantization
|
formulate deformation rozansky witten analogous deformation. applicable hyperkähler spacetime riemann surface. deformed rozansky witten quantizes symplectic submanifold thereby perspective quantization. elucidate phenomena view. correspondence deformation quantization integrable systems. concerns supersymmetric quantization holomorphic hyperkähler manifold
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non_dup
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[] |
25017419
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10.1007/JHEP08(2014)122
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We consider fermionic (Dirac or Majorana) cold thermal relic dark-matter
coupling to standard-model particles through the effective dimension-5 Higgs
portal operators $\Lambda^{-1} \ \mathcal{O}_{\text{DM}} \cdot H^\dagger H$,
where $\mathcal{O}_{\text{DM}}$ is an admixture of scalar $\bar\chi\chi$ and
pseudoscalar $\bar\chi i\gamma_5 \chi$ DM operators. Utilizing the relic
abundance requirement to fix the couplings, we consider direct detection and
invisible Higgs width constraints, and map out the remaining allowed parameter
space of dark-matter mass and the admixture of scalar and pseudoscalar
couplings. We emphasize a subtlety which has not previously been carefully
studied in the context of the EFT approach, in which an effect arising due to
electroweak symmetry breaking can cause a na\"ively pure pseudoscalar coupling
to induce a scalar coupling at higher order, which has important implications
for direct detection bounds. We provide some comments on indirect detection
bounds and collider searches.Comment: 22 pages, 8 figures. Published versio
|
The Fermionic Dark Matter Higgs Portal: an effective field theory
approach
|
the fermionic dark matter higgs portal: an effective field theory approach
|
fermionic dirac majorana cold relic portal lambda mathcal cdot dagger mathcal admixture pseudoscalar gamma operators. utilizing relic abundance requirement couplings invisible admixture pseudoscalar couplings. emphasize subtlety carefully arising electroweak breaking ively pseudoscalar induce bounds. comments indirect bounds collider pages figures. versio
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non_dup
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35082745
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10.1007/JHEP08(2014)124
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One of the most-studied signals for physics beyond the standard model in the production of gauge bosons in electron-positron collisions is due to the anomalous triple gauge boson couplings in the Z γ final state. In this work, we study the implications of this at the ILC with polarized beams for signals that go beyond traditional anomalous triple neutral gauge boson couplings. Here we report a dimension-8 CP-conserving Z γ Z vertex that has not found mention in the literature. We carry out a systematic study of the anomalous couplings in general terms and arrive at a classification. We then obtain linear-order distributions with and without CP violation. Furthermore, we place the study in the context of general BSM interactions represented by e + e − Z γ contact interactions. We set up a correspondence between the triple gauge boson couplings and the four-point contact interactions. We also present sensitivities on these anomalous couplings, which will be achievable at the ILC with realistic polarization and luminosity
|
New physics in e + e − → Z γ at the ILC with polarized beams: explorations beyond conventional anomalous triple gauge boson couplings
|
new physics in e + e − → z γ at the ilc with polarized beams: explorations beyond conventional anomalous triple gauge boson couplings
|
bosons positron collisions anomalous triple boson couplings state. polarized beams traditional anomalous triple neutral boson couplings. conserving mention literature. carry anomalous couplings arrive classification. violation. interactions. correspondence triple boson couplings interactions. sensitivities anomalous couplings achievable realistic luminosity
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non_dup
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35082734
|
10.1007/JHEP08(2014)129
|
We develop techniques for computing superconformal blocks in 4d superconformal field theories. First we study the super-Casimir differential equation, deriving simple new expressions for superconformal blocks for 4-point functions containing chiral operators in theories with N $$ \mathcal{N} $$ -extended supersymmetry. We also reproduce these results by extending the “shadow formalism” of Ferrara, Gatto, Grillo, and Parisi to supersymmetric theories, where superconformal blocks can be represented as superspace integrals of three-point functions multiplied by shadow three-point functions
|
Covariant approaches to superconformal blocks
|
covariant approaches to superconformal blocks
|
superconformal blocks superconformal theories. super casimir deriving expressions superconformal blocks chiral mathcal supersymmetry. reproduce extending “shadow formalism” ferrara gatto grillo parisi supersymmetric superconformal blocks superspace integrals multiplied shadow
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non_dup
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35082726
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10.1007/JHEP08(2014)133
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If a γ -ray line is observed in the near future, it will be important to determine what kind of dark matter (DM) particle could be at its origin. We investigate the possibility that the γ -ray line would be induced by a slow DM particle decay associated to the fact that the DM particle would not be absolutely neutral. A “millicharge” for the DM particle can be induced in various ways, in particular from a kinetic mixing interaction or through the Stueckelberg mechanism. We show that such a scenario could lead in specific cases to an observable γ -ray line. This possibility can be considered in a systematic model-independent way, by writing down the corresponding effective theory. This allows for a multi-channel analysis, giving in particular upper bounds on the intensity of the associated γ -ray line from cosmic rays emission. Our analysis includes the possibility that in the two-body decay the photon is accompanied with a neutrino. We show that, given the stringent constraints which hold on the millicharge of the neutrinos, this is not an option, except if the DM particle mass lies in the very light KeV-MeV range, allowing for a possibility of explanation of the recently claimed, yet to be confirmed, ~ 3.5 KeV X-ray line
|
Can a millicharged dark matter particle emit an observable γ -ray line?
|
can a millicharged dark matter particle emit an observable γ -ray line?
|
kind origin. slow absolutely neutral. “millicharge” ways stueckelberg mechanism. observable line. writing theory. giving bounds cosmic rays emission. accompanied neutrino. stringent hold millicharge neutrinos option lies allowing explanation claimed confirmed
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non_dup
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25018933
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10.1007/JHEP08(2014)135
|
The final state interaction contribution to $D^+$ decays is computed for the
$K^-\pi^+\pi^+$ channel within a light-front relativistic three-body model for
the final state interaction. The rescattering process between the kaon and two
pions in the decay channel is considered. The off-shell decay amplitude is a
solution of a four-dimensional Bethe-Salpeter equation, which is decomposed in
a Faddeev form. The projection onto the light-front of the coupled set of
integral equations is performed via a quasi-potential approach. The S-wave
$K\pi$ interaction is introduced in the resonant isospin $1/2$ and the
non-resonant isospin $3/2$ channels. The numerical solution of the light-front
tridimensional inhomogeneous integral equations for the Faddeev components of
the decay amplitude is performed perturbatively. The loop-expansion converges
fast, and the three-loop contribution can be neglected in respect to the
two-loop results for the practical application. The dependence on the model
parameters in respect to the input amplitude at the partonic level is exploited
and the phase found in the experimental analysis, is fitted with an appropriate
choice of the real weights of the isospin components of the partonic amplitude.
The data suggests a small mixture of total isospin $5/2$ to the dominant $3/2$
one. The modulus of the unsymmetrized decay amplitude, which presents a deep
valley and a following increase for $K\pi$ masses above $1.5$ GeV, is fairly
reproduced. This suggests the assignment of the quantum numbers $0^+$ to the
isospin 1/2 $K^*(1630)$ resonance
|
Final state interaction in $D^+\to K^-\pi^+\pi^+$ with $K\pi$ I=1/2 and
3/2 channels
|
final state interaction in $d^+\to k^-\pi^+\pi^+$ with $k\pi$ i=1/2 and 3/2 channels
|
decays front relativistic interaction. rescattering kaon pions considered. bethe salpeter decomposed faddeev form. projection front quasi approach. resonant isospin resonant isospin channels. front tridimensional inhomogeneous faddeev perturbatively. converges neglected practical application. partonic exploited fitted weights isospin partonic amplitude. mixture isospin one. modulus unsymmetrized presents valley fairly reproduced. assignment isospin
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non_dup
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35082724
|
10.1007/JHEP08(2014)137
|
In a recent work, restricted Schur polynomials have been argued to form a complete orthogonal set of gauge invariant operators for the 1/4-BPS sector of free N $$ \mathcal{N} $$ = 4 super Yang-Mills theory with an SO( N ) gauge group. In this work, we extend these results to the theory with an Sp( N ) gauge group. Using these operators, we develop techniques to compute correlation functions of any multi-trace operators with two scalar fields exactly in the free theory limit for both SO( N ) and Sp( N )
|
Restricted Schurs and correlators for SO( N ) and Sp( N )
|
restricted schurs and correlators for so( n ) and sp( n )
|
restricted schur polynomials argued orthogonal mathcal super mills group. extend group. trace
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non_dup
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[] |
33616001
|
10.1007/JHEP08(2014)143
|
The kinematic dependences of the relative production rates, $f_{\Lambda_b^0}/f_d$, of $\Lambda_b^0$ baryons and $\bar{B}^0$ mesons are measured using $\Lambda_b^0 \rightarrow \Lambda_c^+ \pi^-$ and $\bar{B}^0 \rightarrow D^+ \pi^-$ decays. The measurements use proton-proton collision data, corresponding to an integrated luminosity of 1 fb$^{-1}$ at a centre-of-mass energy of 7 TeV, recorded in the forward region with the LHCb experiment. The relative production rates are observed to depend on the transverse momentum, $p_T$, and pseudorapidity, $\eta$, of the beauty hadron, in the studied kinematic region 1.5<pT<40 GeV/c and 2<η<5. Using a previous LHCb measurement of $f_{\Lambda_b^0}/f_d$ in semileptonic decays, the branching fraction $\mathcal{B}(\Lambda_b^0 \rightarrow \Lambda_c^+ \pi^-) = \Big( 4.30 \pm 0.03 \,\, ^{+0.12}_{-0.11} \pm 0.26 \pm 0.21 \Big) \times 10^{-3}$ is obtained, where the first uncertainty is statistical, the second is systematic, the third is from the previous LHCb measurement of $f_{\Lambda_b^0}/f_d$ and the fourth is due to the $\bar{B}^0 \rightarrow D^+ \pi^-$ branching fraction. This is the most precise measurement of a$\Lambda_b^0$ branching fraction to date
|
Study of the kinematic dependences of $\Lambda_b^0$ production in $pp$ collisions and a measurement of the $\Lambda_b^0 \rightarrow \Lambda_c^+\pi^-$ branching fraction
|
study of the kinematic dependences of $\lambda_b^0$ production in $pp$ collisions and a measurement of the $\lambda_b^0 \rightarrow \lambda_c^+\pi^-$ branching fraction
|
kinematic dependences lambda lambda baryons mesons lambda rightarrow lambda rightarrow decays. proton proton collision luminosity lhcb experiment. pseudorapidity beauty hadron kinematic lhcb lambda semileptonic decays branching mathcal lambda rightarrow lambda lhcb lambda fourth rightarrow branching fraction. precise lambda branching
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non_dup
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25013813
|
10.1007/JHEP08(2014)145
|
We begin by explicating a recent proof of the cluster decomposition principle
in AdS_{d+1} from the CFT_d bootstrap in d > 2. The CFT argument also computes
the leading interactions between distant objects in AdS, and we confirm the
universal agreement between the CFT bootstrap and AdS gravity in the
semi-classical limit. We proceed to study the generalization to 2d CFTs, which
requires knowledge of the Virasoro conformal blocks in a lightcone OPE limit.
We compute these blocks in a semiclassical, large central charge approximation,
and use them to prove a suitably modified theorem. In particular, from the 2d
bootstrap we prove the existence of large spin operators with fixed 'anomalous
dimensions' indicative of the presence of deficit angles in AdS_3. As we
approach the threshold for the BTZ black hole, interpreted as a CFT scaling
dimension, the twist spectrum of large spin operators becomes dense. Due to the
exchange of the Virasoro identity block, primary states above the BTZ threshold
mimic a thermal background for light operators. We derive the BTZ quasi-normal
modes, and we use the bootstrap equation to prove that the twist spectrum is
dense. Corrections to thermality could be obtained from a more refined
computation of the Virasoro conformal blocks.Comment: 34+31 pages, references added, typo in higher-dimensional energy
shift corrected, discussion of coefficient density bounds expande
|
Universality of Long-Distance AdS Physics from the CFT Bootstrap
|
universality of long-distance ads physics from the cft bootstrap
|
begin explicating decomposition bootstrap argument computes distant confirm universal bootstrap limit. proceed generalization cfts virasoro conformal blocks lightcone limit. blocks semiclassical suitably theorem. bootstrap anomalous indicative deficit angles interpreted twist dense. virasoro mimic operators. derive quasi bootstrap twist dense. thermality refined virasoro conformal pages typo corrected bounds expande
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non_dup
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25025114
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10.1007/JHEP08(2014)146
|
In three dimensions, an abelian gauge field is related by duality to a free,
periodic scalar field. Though usually considered on Euclidean space, this
duality can be extended to a general three-manifold M, in which case
topological features of M become important. Here I comment upon several of
these features as related to the partition function on M. In a companion
article, arXiv:1405.2483, I discuss similarly the algebra of operators on a
surface of genus g.Comment: 62 pages, 1 figure, v2: references adde
|
Global Aspects of Abelian Duality in Dimension Three
|
global aspects of abelian duality in dimension three
|
abelian duality field. euclidean duality manifold topological important. comment partition companion genus pages adde
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non_dup
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25033021
|
10.1007/JHEP08(2014)154
|
We describe a general algorithm which builds on several pieces of data
available in the literature to construct explicit analytic formulas for
two-loop MHV amplitudes in N=4 super-Yang-Mills theory. The non-classical part
of an amplitude is built from $A_3$ cluster polylogarithm functions; classical
polylogarithms with (negative) cluster X-coordinate arguments are added to
complete the symbol of the amplitude; beyond-the-symbol terms proportional to
$\pi^2$ are determined by comparison with the differential of the amplitude;
and the overall additive constant is fixed by the collinear limit. We present
an explicit formula for the seven-point amplitude $R_7^{(2)}$ as a sample
application.Comment: 17 pages, 1 figure; v2: minor changes; v3: added a section with some
background materia
|
An analytic result for the two-loop seven-point MHV amplitude in N=4 SYM
|
an analytic result for the two-loop seven-point mhv amplitude in n=4 sym
|
builds pieces analytic formulas amplitudes super mills theory. built polylogarithm polylogarithms coordinate arguments symbol symbol additive collinear limit. seven pages minor materia
|
non_dup
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[] |
24981967
|
10.1007/JHEP08(2014)155
|
The MT2 or "s-transverse mass" statistic was developed to associate a parent
mass scale to a missing transverse energy signature, given that escaping
particles are generally expected in pairs, while collider experiments are
sensitive to just a single transverse momentum vector sum. This document
focuses on the generalized extension of that statistic to asymmetric one- and
two-step decay chains, with arbitrary child particle masses and upstream
missing transverse momentum. It provides a unified theoretical formulation,
complete solution classification, taxonomy of critical points, and technical
algorithmic prescription for treatment of the MT2 event scale. An
implementation of the described algorithm is available for download, and is
also a deployable component of the author's selection cut software package
AEACuS (Algorithmic Event Arbiter and Cut Selector). Appendices address
combinatoric event assembly, algorithm validation, and a complete pseudocode.Comment: As published in JHEP; appendices address combinatoric event assembly,
algorithm validation, and a complete pseudocode; program revision included as
ancillary file; 32 pages; 6 illustrated event case studies; 7 footnoted event
case studie
|
A Complete Solution Classification and Unified Algorithmic Treatment for
the One- and Two-Step Asymmetric S-Transverse Mass (MT2) Event Scale
Statistic
|
a complete solution classification and unified algorithmic treatment for the one- and two-step asymmetric s-transverse mass (mt2) event scale statistic
|
statistic associate parent missing signature escaping collider sum. document focuses statistic asymmetric chains upstream missing momentum. unified formulation taxonomy algorithmic prescription scale. download deployable package aeacus algorithmic arbiter selector appendices combinatoric assembly validation jhep appendices combinatoric assembly validation pseudocode revision ancillary file pages illustrated footnoted studie
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non_dup
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25007924
|
10.1007/JHEP08(2014)158
|
We give a construction for a general class of vertices in superstring field
theory which include integration over bosonic moduli as well as the required
picture changing insertions. We apply this procedure to find a covariant action
for the NS-NS sector of Type II closed superstring field theory.Comment: 33 pages, 2 figures. Removed discussion of imprecise analogy between
the closed string products and tensor products of open string products. New
appendix includes explicit expressions for the quartic open and heterotic
vertice
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NS-NS Sector of Closed Superstring Field Theory
|
ns-ns sector of closed superstring field theory
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superstring bosonic moduli picture changing insertions. covariant superstring pages figures. removed imprecise analogy products. expressions quartic heterotic vertice
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non_dup
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35081391
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10.1007/JHEP08(2014)159
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A sample of 65210 K ± → π 0 π 0 e ± ν (K e4 00 ) decay candidates with 1% background contamination has been collected in 2003-2004 by the NA48/2 collaboration at the CERN SPS. A study of the differential rate provides the first measurement of the hadronic form factor variation in the plane ( M ππ 2 , M eν 2 ) and brings evidence for a cusp-like structure in the distribution of the squared π 0 π 0 invariant mass around 4 m π + 2 $$ 4{m}_{\pi^{+}}^2 $$ . Exploiting a model independent description of this form factor, the branching ratio, inclusive of radiative decays, is obtained using the K ± → π 0 π 0 π ± decay mode as normalization. It is measured to be BR(K e4 00 ) = (2.552 ± 0.010 stat ± 0.010 syst ± 0.032 ext ) × 10 −5 , which improves the current world average precision by an order of magnitude while the 1.4% relative precision is dominated by the external uncertainty from the normalization mode. A comparison with the properties of the corresponding mode involving a π + π − pair (K e4 + − ) is also presented
|
Detailed study of the K ± → π 0 π 0 e ± ν (K e4 00 ) decay properties
|
detailed study of the k ± → π 0 π 0 e ± ν (k e4 00 ) decay properties
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candidates contamination cern sps. hadronic brings cusp squared exploiting branching inclusive radiative decays normalization. stat syst improves precision precision dominated normalization mode. involving
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non_dup
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35082689
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10.1007/JHEP08(2014)161
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In recent years the search for dark matter has intensified with competitive bounds coming from collider searches, direct detection, and indirect detection. Collider searches at the Large Hadron Collider (LHC) lack the necessary center-of-mass energy to probe TeV-scale dark matter. It is TeV-scale dark matter, however, that remains viable for many models of supersymmetry. In this paper, we study the reach of a 100 TeV proton-proton collider for neutralino dark matter and compare to 14 TeV LHC projections. We employ a supersymmetric simplified model approach and present reach estimates from monojet searches, soft lepton searches, and disappearing track searches. The searches are applied to pure neutralino spectra, compressed neutralino spectra, and coannihilating spectra. We find a factor of 4-5 improvement in mass reach in going from 14 TeV to 100 TeV. More specifically, we find that given a 1% systematic uncertainty, a 100 TeV collider could exclude winos up to 1.4 TeV and higgsinos up to 850 GeV in the monojet channel. Coannihilation scenarios with gluinos can be excluded with neutralino masses of 6.2 TeV, with stops at 2.8 TeV, and with squarks at 4.0 TeV. Using a soft lepton search, compressed spectra with a chargino-neutralino splitting of Δ m = 20 − 30 GeV can exclude neutralinos at ~1 TeV. Given a sufficiently long chargino lifetime, the disappearing track search is very effective and we extrapolate current experimental bounds to estimate that a ~2TeVwinocouldbediscoveredanda ~3TeVwinocouldbeexcluded
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Neutralino dark matter at 14 TeV and 100 TeV
|
neutralino dark matter at 14 tev and 100 tev
|
intensified competitive bounds coming collider searches indirect detection. collider searches hadron collider matter. viable supersymmetry. proton proton collider neutralino projections. employ supersymmetric simplified monojet searches lepton searches disappearing track searches. searches neutralino compressed neutralino coannihilating spectra. going tev. collider exclude winos higgsinos monojet channel. coannihilation scenarios gluinos excluded neutralino stops squarks tev. lepton compressed chargino neutralino splitting exclude neutralinos tev. sufficiently chargino lifetime disappearing track extrapolate bounds tevwinocouldbediscoveredanda tevwinocouldbeexcluded
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24983660
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10.1007/JHEP08(2014)165
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Existence of an entropy current with non-negative divergence puts a lot of
constraints on the transport coefficients of a fluid, so does the existence of
equilibrium. In all the cases we have studied so far we have seen an overlap
between these two sets of constraints. In this note we shall try to explore the
reason for such an overlap. We shall also see how a part of the entropy current
could be determined from the equilibrium partition function.Comment: 39 pages, Version-2: Added a new section and some more arguments in
the old sections, added new references and corrected typos. 45 pages Version
3: 50 pages, introduction has been modified, added a new section, added
reference
|
Entropy current and equilibrium partition function in fluid dynamics
|
entropy current and equilibrium partition function in fluid dynamics
|
divergence puts equilibrium. overlap constraints. explore overlap. partition pages arguments corrected typos. pages pages
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non_dup
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25025479
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10.1007/JHEP08(2014)167
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We construct super-Yang-Mills theories on S4 x R, S4 x S1 and S4 x interval
with the field content of maximal SYM, coupled to boundary degrees in the last
case. These theories provide building blocks of the `5d uplifts' of gauge
theories on S4, obtained by compactifying the 6d (2,0) theory. We pay special
attention to the N=2* theory on S4. We also explain how to construct maximal
SYM on S5 x R, and clarify when SYM theories can be put on S^n x R.Comment: 28 pages, no figures; v2. refs added, typos corrected, minor revisio
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Super-Yang-Mills theories on S4 x R
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super-yang-mills theories on s4 x r
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super mills maximal case. blocks uplifts compactifying theory. maximal clarify pages refs typos corrected minor revisio
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non_dup
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25038973
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10.1007/JHEP08(2014)175
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We investigate the gauge-Higgs unification models compactified on T^2/Z_N
that have the custodial symmetry. We select possible gauge groups, orbifolds
and representations of the matter fermions that are consistent with the
custodial symmetry, by means of the group theoretical analysis. The best
candidate we found is 6D SU(3)_C x U(4) gauge theory on T^2/Z_3 and the third
generation quarks are embedded into bulk fermions that are the symmetric
traceless rank-2 tensor of SO(6).Comment: 38 pages, 1 table, a reference adde
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6D gauge-Higgs unification on T^2/Z_N with custodial symmetry
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6d gauge-higgs unification on t^2/z_n with custodial symmetry
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unification compactified custodial symmetry. select orbifolds representations fermions custodial analysis. candidate quarks embedded fermions traceless .comment pages adde
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29510301
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10.1007/JHEP08(2015)002
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The Goldstone equivalence theorem allows one to relate scattering amplitudes
of massive gauge fields to those of scalar fields in the limit of large
scattering energies. We generalize this theorem under the framework of the
AdS/CFT correspondence. First, we obtain an expression of the equivalence
theorem in terms of correlation functions of creation and annihilation
operators by using an AdS wave function approach to the AdS/CFT dictionary. It
is shown that the divergence of the non-conserved conformal current dual to the
bulk gauge field is approximately primary when computing correlators for
theories in which the masses of all the exchanged particles are sufficiently
large. The results are then generalized to higher spin fields.
We then go on to generalize the theorem using conformal blocks in two and
four-dimensional CFTs. We show that when the scaling dimensions of the
exchanged operators are large compared to both their spins and the dimension of
the current, the conformal blocks satisfy an equivalence theorem.Comment: 32 pages + appendices, 5 figure
|
The Goldstone Equivalence Theorem and AdS/CFT
|
the goldstone equivalence theorem and ads/cft
|
goldstone equivalence relate amplitudes massive energies. generalize correspondence. equivalence creation annihilation dictionary. divergence conserved conformal correlators exchanged sufficiently large. fields. generalize conformal blocks cfts. exchanged spins conformal blocks satisfy equivalence pages appendices
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80331161
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10.1007/JHEP08(2015)004
|
Journal of High Energy Physics 2015.8 (2015): 004 reproduced by permission of Scuola
Internazionale Superiore di Studi Avanzati (SISSA)Abstract: The addition of a scalar singlet provides one of the simplest extensions of the Standard Model. In this work we briefly review the latest constraints on the mass and mixing of the new Higgs boson and study its production and decay at the LHC. We mainly focus on double Higgs production in the hh → bb WW → bbℓ+ νℓ- νdecay channel. This decay is found to be efficient in a region of masses of the heavy Higgs boson of 260-500 GeV, so it is complementary to the 4b channel, more efficient for Higgs bosons with masses greater than 500 GeV. We analyse this di-leptonic decay channel in detail using kinematic variables such as MT2 and the MT2-assisted on-shell reconstruction of invisible momenta. Using proper cuts, a significance of ∼ 3σ for 3000 fb−1 can be achieved at the 14 TeV LHC for mH = 260-400 GeV if the mixing is close to its present limit and BR(H → hh) ≈ 1. Smaller values for the mixing would require combining various decay channels in order to reach a similar significance. The complementarity among H → hh, H →ZZ andH →WW channels is studied for arbitrary BR(H →hh) valuesJMM and VML are partially supported by the grants FPA2010-17747, FPA2012-34694, FPA2013-44773-P and from the Spanish MINECO, Consolider-Ingenio CPAN CSD2007-00042 and MULTIDARK CSD2009-00064 as well as the Centro de Excelencia Severo Ochoa Program under Grant No. SEV-2012-0249. VML also thanks support by the ERC Advanced Grant SPLE under contract ERC-2012-ADG-20120216-320421. The work of CBP was partially supported by the CERN-Korea fellowship through National Research Foundation of Kore
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Resonant Higgs boson pair production in the hh → b¯b WW → b¯b`+ν`−ν¯ decay channel
|
resonant higgs boson pair production in the hh → b¯b ww → b¯b`+ν`−ν¯ decay channel
|
reproduced permission scuola internazionale superiore studi avanzati sissa singlet simplest extensions model. briefly latest boson lhc. νdecay channel. boson complementary bosons gev. analyse leptonic kinematic assisted reconstruction invisible momenta. proper cuts combining significance. complementarity andh valuesjmm partially grants spanish mineco consolider ingenio cpan multidark centro excelencia severo ochoa thanks advanced sple contract partially cern korea fellowship foundation kore
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29513441
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10.1007/JHEP08(2015)024
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We consider linear star products on $R^d$ of Lie algebra type. First we
derive the closed formula for the polydifferential representation of the
corresponding Lie algebra generators. Using this representation we define the
Weyl star product on the dual of the Lie algebra. Then we construct a gauge
operator relating the Weyl star product with the one which is closed with
respect to some trace functional, $Tr( f\star g)= Tr( f\cdot g)$. We introduce
the derivative operator on the algebra of the closed star product and show that
the corresponding Leibnitz rule holds true up to a total derivative. As a
particular example we study the space $R^3_\theta$ with $\mathfrak{su}(2)$ type
noncommutativity and show that in this case the closed star product is the one
obtained from the Duflo quantization map. As a result a Laplacian can be
defined such that its commutative limit reproduces the ordinary commutative
one. The deformed Leibnitz rule is applied to scalar field theory to derive
conservation laws and the corresponding noncommutative currents.Comment: published versio
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Noncommutative $R^d$ via closed star product
|
noncommutative $r^d$ via closed star product
|
type. derive polydifferential generators. weyl algebra. relating weyl trace cdot leibnitz derivative. theta mathfrak noncommutativity duflo quantization map. laplacian commutative reproduces ordinary commutative one. deformed leibnitz derive conservation laws noncommutative versio
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non_dup
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29526220
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10.1007/JHEP08(2015)026
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We find a new regular solution of six-dimensional Einstein's equations with a
positive cosmological constant. It has the same isometry group as the
(deformed) conifold geometry, and the superpotential approach is used to solve
the equations of motion. The space is compact and interpolates between the
deformed conifold and the resolved cone with a blown-up four cycle. The
deformation/resolution parameters are set by the cosmological constant.Comment: 10 pages, 2 figures, JHEP style; v2: comments and references added,
typos fixed; v3: even more comments addde
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A deformed conifold with a cosmological constant
|
a deformed conifold with a cosmological constant
|
einstein cosmological constant. isometry deformed conifold superpotential solve motion. interpolates deformed conifold resolved cone blown cycle. deformation cosmological pages jhep style comments typos comments addde
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non_dup
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29537454
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10.1007/JHEP08(2015)046
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We study D1-brane in AdS_3 times S^3 kappa-deformed background with
non-trivial dilaton and Ramond-Ramond fields. We consider purely time-dependent
and spatially-dependent ansatz where we study the solutions of the equations of
motion for D1-brane in given background. We find that the behavior of these
solutions crucially depends on the value of the parameter a that was introduced
in [arXiv:1411.1066 [hep-th]].Comment: Added References Minor changes were done where "D1 brane reaches the
boundary" term was replaced by $D1 brane reaches \rho\rightarrow\infty$ We
would like to express our special thanks to anonymous refere
|
D-brane on Deformed AdS_3 times S^3
|
d-brane on deformed ads_3 times s^3
|
brane kappa deformed trivial dilaton ramond ramond fields. purely spatially ansatz brane background. crucially .comment minor brane reaches replaced brane reaches rightarrow infty express thanks anonymous refere
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non_dup
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29521286
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10.1007/JHEP08(2015)063
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Bions are multiple fractional instanton configurations with zero instanton
charge playing important roles in quantum field theories on a compactified
space with a twisted boundary condition. We classify fractional instantons and
bions in the $SU(N)$ principal chiral model on ${\mathbb R}^2 \times S^1$ with
twisted boundary conditions. We find that fractional instantons are global
vortices wrapping around $S^1$ with their $U(1)$ moduli twisted along $S^1$,
that carry $1/N$ instanton (baryon) numbers for the ${\mathbb Z}_N$ symmetric
twisted boundary condition and irrational instanton numbers for generic
boundary condition. We work out neutral and charged bions for the $SU(3)$ case
with the ${\mathbb Z}_3$ symmetric twisted boundary condition. We also find for
generic boundary conditions that only the simplest neutral bions have zero
instanton charges but instanton charges are not canceled out for charged bions.
A correspondence between fractional instantons and bions in the $SU(N)$
principal chiral model and those in Yang-Mills theory is given through a
non-Abelian Josephson junction.Comment: 30 pages, 2 figures. v2: published version. arXiv admin note: text
overlap with arXiv:1412.768
|
Fractional instantons and bions in the principal chiral model on
${\mathbb R}^2\times S^1$ with twisted boundary conditions
|
fractional instantons and bions in the principal chiral model on ${\mathbb r}^2\times s^1$ with twisted boundary conditions
|
bions fractional instanton configurations instanton playing roles compactified twisted condition. classify fractional instantons bions principal chiral mathbb twisted conditions. fractional instantons vortices wrapping moduli twisted carry instanton baryon mathbb twisted irrational instanton generic condition. neutral bions mathbb twisted condition. generic simplest neutral bions instanton charges instanton charges canceled bions. correspondence fractional instantons bions principal chiral mills abelian josephson pages figures. version. admin overlap
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29531777
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10.1007/JHEP08(2015)071
|
We study the matrix models calculating the sphere partition functions of 3d
gauge theories with $\mathcal{N}=4$ supersymmetry and a quiver structure of a
$\hat D$ Dynkin diagram (where each node is a unitary gauge group). As in the
case of necklace ($\hat A $) quivers, we can map the problem to that of free
fermion quantum mechanics whose complicated Hamiltonian we find explicitly.
Many of these theories are conjectured to be dual under mirror symmetry to
certain unitary linear quivers with extra Sp nodes or antisymmetric
hypermultiplets. We show that the free fermion formulations of such mirror
pairs are related by a linear symplectic transformation.
We then study the large N expansion of the partition function, which as in
the case of the $\hat A$-quivers is given to all orders in 1/N by an Airy
function. We simplify the algorithm to calculate the numerical coefficients
appearing in the Airy function and evaluate them for a wide class of $\hat
D$-quiver theories.Comment: 39 pages, 8 figure
|
Partition functions of 3d $\hat D$-quivers and their mirror duals from
1d free fermions
|
partition functions of 3d $\hat d$-quivers and their mirror duals from 1d free fermions
|
calculating sphere partition mathcal supersymmetry quiver dynkin unitary necklace quivers fermion mechanics complicated explicitly. conjectured mirror unitary quivers extra antisymmetric hypermultiplets. fermion formulations mirror symplectic transformation. partition quivers orders airy function. simplify appearing airy quiver pages
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non_dup
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87082468
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10.1007/JHEP08(2015)078
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Journal of High Energy Physics 2015.8 (2015): 078 reproduced by permission of Scuola Internazionale Superiore di Studi Avanzati (SISSA)The problem of the comological constant appears in a new light in Unimodular
Gravity. In particular, the zero momentum piece of the potential (that is, the constant piece
independent of the matter fields) does not automatically produce a cosmological constant
proportional to it. The aim of this paper is to give some details on a calculation showing
that quantum corrections do not renormalize the classical value of this observableThis work has been partially supported by the European Union FP7 ITN INVISIBLES (Marie Curie Actions, PITN- GA-2011- 289442) and (HPRN-CT-200-00148); COST action MP1405 (Quantum Structure of Spacetime), COST action MP1210 (The String Theory Universe) as well as by FPA2012-31880 (MICINN, Spain), FPA2011-24568 (MICINN, Spain), and S2009ESP-1473 (CA Madrid). The authors acknowledge the support of the Spanish MINECO Centro de Excelencia Severo Ochoa Programme under grant SEV-2012-024
|
Quantum corrections to unimodular gravity
|
quantum corrections to unimodular gravity
|
reproduced permission scuola internazionale superiore studi avanzati sissa comological unimodular gravity. piece piece automatically cosmological renormalize observablethis partially union invisibles marie curie pitn hprn spacetime universe micinn spain micinn spain madrid acknowledge spanish mineco centro excelencia severo ochoa programme
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non_dup
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29528096
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10.1007/JHEP08(2015)080
|
Two puzzling facts of our time are the observed patterns in the fermion
masses and mixings and the existence of non-baryonic dark matter, which are
both often associated with extensions of the Standard Model at higher energy
scales. In this paper, we consider a solution to these two problems with the
flavour symmetry ${\mathbb A}_4\times {\mathbb Z}_2\times {\mathbb
Z}_2^\prime$, in a model which has been shown before to explain large leptonic
mixings with a specific texture. The model contains 3 generations of
$SU(2)_L$-doublet scalar fields, arranged as an ${\mathbb A}_4$-triplet, that
spontaneously break the electroweak symmetry, and a "dark sector" of ${\mathbb
Z}_2$-odd fields, containing one Majorana neutrino and an ${\mathbb
A}_4$-triplet $SU(2)_L$-doublet scalar field, the lightest of which provides a
candidate for dark matter.
Concerning the ${\mathbb Z}_2$-even scalar fields, compared to the Standard
Model, we predict additional fields with masses at the electroweak scale. We
therefore investigate present phenomenological constraints from lepton flavour
violation experiments, obtaining a lower bound on the extra scalar masses of
140 GeV. Furthermore we consider the oblique parameters, Higgs boson decay
properties and possible flavour violating signals at the LHC.
Concerning the "dark sector", we study bounds from dark matter search
experiments and identify the parameter space of the dark matter candidate that
is compatible with the observed relic density. We find two allowed mass ranges
for the dark matter within which the experimental constraints can be
accommodated: the low-mass range is from 47 GeV to 74 GeV and the high-mass
range is from 600 GeV and 3.6 TeV.Comment: v2, to be published in JHE
|
$A_4$ symmetry at colliders and in the universe
|
$a_4$ symmetry at colliders and in the universe
|
puzzling facts fermion mixings baryonic extensions scales. flavour mathbb mathbb mathbb prime leptonic mixings texture. generations doublet arranged mathbb triplet spontaneously break electroweak mathbb majorana mathbb triplet doublet lightest candidate matter. concerning mathbb predict electroweak scale. phenomenological lepton flavour violation obtaining extra gev. oblique boson flavour violating lhc. concerning bounds candidate compatible relic density. ranges accommodated
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non_dup
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29521368
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10.1007/JHEP08(2015)085
|
We study Grothendieck's dessins d'enfants in the context of the
$\mathcal{N}=2$ supersymmetric gauge theories in $\left(3+1\right)$ dimensions
with product $SU\left(2\right)$ gauge groups which have recently been
considered by Gaiotto et al. We identify the precise context in which dessins
arise in these theories: they are the so-called ribbon graphs of such theories
at certain isolated points in the Coulomb branch of the moduli space. With this
point in mind, we highlight connections to other work on trivalent dessins,
gauge theories, and the modular group.Comment: 44 pages, 8 figures. v2: Minor corrections made throughout the text.
Matches published version. Background discussion of BPS quivers based upon
arXiv:1109.494
|
Dessins d'Enfants in $\mathcal{N}=2$ Generalised Quiver Theories
|
dessins d'enfants in $\mathcal{n}=2$ generalised quiver theories
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grothendieck dessins enfants mathcal supersymmetric gaiotto precise dessins arise ribbon coulomb branch moduli space. mind highlight connections trivalent dessins modular pages figures. minor text. matches version. quivers
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non_dup
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29543902
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10.1007/JHEP08(2015)106
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We compute the number of massive vacua of N=4 supersymmetric Yang-Mills
theory mass-deformed to preserve N=1 supersymmetry, for any gauge group G. We
use semi-classical techniques and efficiently reproduce the known counting for
A,B and C-type gauge groups, present the generating function for both O(2n) and
SO(2n), and compute the supersymmetric index for gauge groups of exceptional
type. A crucial role is played by the classification of nilpotent orbits, as
well as global properties of their centralizers. We give illustrative examples
of new features of our analysis for the D-type algebras.Comment: 21 pages, 4 figure
|
Counting the Massive Vacua of N=1* Super Yang-Mills Theory
|
counting the massive vacua of n=1* super yang-mills theory
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massive vacua supersymmetric mills deformed preserve supersymmetry efficiently reproduce counting generating supersymmetric exceptional type. crucial played nilpotent orbits centralizers. illustrative pages
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non_dup
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29552556
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10.1007/JHEP08(2015)121
|
It is well known that Hopf-fibre T-duality and uplift takes the D1-D5
near-horizon into a class of $AdS_3 \times S^2$ geometries in 11D where the
internal space is a Calabi-Yau three-fold. Moreover, supersymmetry dictates
that Calabi-Yau is the only permissible $SU(3)$-structure manifold.
Generalising this duality chain to non-Abelian isometries, a strong parallel
exists, resulting in the first explicit example of a class of $AdS_3 \times
S^2$ geometries with $SU(2)$-structure. Furthermore, the non-Abelian T-dual of
$AdS_3 \times S^3 \times S^3 \times S^1$ results in a new supersymmetric $AdS_3
\times S^2$ geometry, which falls outside of all known classifications. We
explore the basic properties of the holographic duals associated to the new
backgrounds. We compute the central charges and show that they are compatible
with a large $\mathcal{N}=4$ superconformal algebra in the infra-red.Comment: 30 pages plus one appendix. v2: updated references, v3: published
versio
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New $AdS_3 \times S^2$ T-duals with $\mathcal{N} = (0,4)$ supersymmetry
|
new $ads_3 \times s^2$ t-duals with $\mathcal{n} = (0,4)$ supersymmetry
|
hopf fibre duality uplift horizon geometries calabi fold. supersymmetry dictates calabi permissible manifold. generalising duality abelian isometries geometries structure. abelian supersymmetric falls classifications. explore holographic duals backgrounds. charges compatible mathcal superconformal infra pages appendix. updated versio
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non_dup
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29544950
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10.1007/JHEP08(2015)122
|
We consider a certain ${\cal N}=1$ supersymmetric, $SO(3)\times SO(3)$
invariant, subsector of the $\omega$-deformed family of $SO(8)$-gauged ${\cal
N}=8$ four-dimensional supergravities. The theory contains two scalar fields
and two pseudoscalar fields. We look for stationary points of the scalar
potential, corresponding to AdS vacua in the theory. One of these, which breaks
all supersymmetries but is nonetheless stable, is new. It exists only when
$\omega\ne 0$. We construct supersymmetric domain wall solutions in the
truncated theory, and we give a detailed analysis of their holographic dual
interpretations using the AdS/CFT correspondence. Domain walls where the
pseudoscalars vanish were studied previously, but those with non-vanishing
pseudoscalars, which we analyse numerically, are new. The pseudoscalars are
associated with supersymmetric mass deformations in the CFT duals. When
$\omega$ is zero, the solutions can be lifted to M-theory, where they approach
the Coulomb-branch flows of dielectric M5-branes wrapped on $S^3$ in the deep
IR.Comment: 40 pages, 10 figure
|
Holographic RG Flow in a New $SO(3)\times SO(3)$ Sector of
$\omega$-Deformed $SO(8)$ Gauged ${\cal N}=8$ Supergravity
|
holographic rg flow in a new $so(3)\times so(3)$ sector of $\omega$-deformed $so(8)$ gauged ${\cal n}=8$ supergravity
|
supersymmetric subsector omega deformed gauged supergravities. pseudoscalar fields. look stationary vacua theory. breaks supersymmetries nonetheless new. omega supersymmetric truncated holographic interpretations correspondence. walls pseudoscalars vanish vanishing pseudoscalars analyse numerically new. pseudoscalars supersymmetric deformations duals. omega lifted coulomb branch flows dielectric branes wrapped pages
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non_dup
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29550118
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10.1007/JHEP08(2015)125
|
We study implications of N=4 superconformal symmetry in three dimensions,
thus extending our earlier results in arXiv:1503.04961 devoted to the N=1,2,3
cases. We show that the three-point function of the supercurrent in N=4
superconformal field theories contains two linearly independent forms. However,
only one of these structures contributes to the three-point function of the
energy-momentum tensor and the other one is present in those N=4 superconformal
theories which are not invariant under the mirror map. We point out that
general N=4 superconformal field theories admit two inequivalent flavour
current multiplets and show that the three-point function of each of them is
determined by one tensor structure. As an example, we compute the two- and
three-point functions of the conserved currents in N=4 superconformal models of
free hypermultiplets. We also derive the universal relations between the
coefficients appearing in the two- and three-point correlators of the
supercurrent and flavour current multiplets in all superconformal theories with
N=1,2,3,4 supersymmetry. Our derivation is based on the use of Ward identities
in conjunction with superspace reduction techniques.Comment: 75 page
|
Implications of N=4 superconformal symmetry in three spacetime
dimensions
|
implications of n=4 superconformal symmetry in three spacetime dimensions
|
superconformal extending devoted cases. supercurrent superconformal linearly forms. contributes superconformal mirror map. superconformal admit inequivalent flavour multiplets structure. conserved currents superconformal hypermultiplets. derive universal appearing correlators supercurrent flavour multiplets superconformal supersymmetry. derivation ward identities conjunction superspace
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non_dup
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35088439
|
10.1007/JHEP08(2015)149
|
We use the recently constructed solution for marginal deformations by one of the authors, to analytically relate the BCFT modulus (λ BCFT ) to the coefficient of the boundary marginal field in the solution (λ SFT ). We explicitly find that the relation is not one to one and the same value of λ SFT corresponds to a pair of different λ BCFT ’s: a “small” one, and a “large” one. The BCFT moduli space is fully covered, but the coefficient of the marginal field in the solution is not a good global coordinate on such a space
|
Large BCFT moduli in open string field theory
|
large bcft moduli in open string field theory
|
marginal deformations analytically relate bcft modulus bcft marginal explicitly bcft “small” “large” one. bcft moduli covered marginal coordinate
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non_dup
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35088379
|
10.1007/JHEP08(2015)161
|
Based on an explicit model, we propose and discuss the generic features of a possible implementation of the Twin Higgs program in the context of composite Higgs models. We find that the Twin Higgs quadratic divergence cancellation argument can be uplifted to a genuine protection of the Higgs potential, based on symmetries and selection rules, but only under certain conditions which are not fulfilled in some of the existing models. We also find that a viable scenario, not plagued by a massless Twin Photon, can be obtained by not gauging the Twin Hypercharge and taking this as the only source of Twin Symmetry breaking at a very high scale
|
The composite twin Higgs scenario
|
the composite twin higgs scenario
|
propose generic twin composite models. twin quadratic divergence cancellation argument uplifted genuine protection symmetries fulfilled models. viable plagued massless twin gauging twin hypercharge twin breaking
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non_dup
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[] |
42730566
|
10.1007/JHEP08(2016)001
|
Asymmetries in heavy quark pair and dijet production in electron-proton
collisions allow studies of gluon TMDs in close analogy to studies of quark
TMDs in semi-inclusive DIS. Here we present expressions for azimuthal
asymmetries for both unpolarized and transversely polarized proton cases and
consider the maximal asymmetries allowed. The latter are found to be rather
sizeable, except in certain kinematic limits which are pointed out. In
addition, we consider the small-x limit and expectations from a
McLerran-Venugopalan model for unpolarized and linearly polarized gluons and
from a perturbative, large transverse momentum calculation for the T-odd gluon
TMDs. Comparison to related observables at RHIC and LHC is expected to provide
valuable information about the process dependence of the gluon TMDs. In
particular this will offer the possibility of a sign change test of the gluon
Sivers TMD and two other T-odd gluon TMDs. This provides additional motivation
for studies of azimuthal asymmetries in heavy quark pair and dijet production
at a future Electron-Ion Collider.Comment: 16 pages, 9 figure
|
Asymmetries in Heavy Quark Pair and Dijet Production at an EIC
|
asymmetries in heavy quark pair and dijet production at an eic
|
asymmetries dijet proton collisions gluon tmds analogy tmds inclusive dis. expressions azimuthal asymmetries unpolarized transversely polarized proton maximal asymmetries allowed. sizeable kinematic pointed out. expectations mclerran venugopalan unpolarized linearly polarized gluons perturbative gluon tmds. observables rhic valuable gluon tmds. offer gluon sivers gluon tmds. motivation azimuthal asymmetries dijet pages
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non_dup
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[] |
42674316
|
10.1007/JHEP08(2016)002
|
Jets are an important probe to identify the hard interaction of interest at
the LHC. They are routinely used in Standard Model precision measurements as
well as in searches for new heavy particles, including jet substructure
methods. In processes with several jets, one typically encounters hierarchies
in the jet transverse momenta and/or dijet invariant masses. Large logarithms
of the ratios of these kinematic jet scales in the cross section are at present
primarily described by parton showers. We present a general factorization
framework called SCET$_+$, which is an extension of Soft-Collinear Effective
Theory (SCET) and allows for a systematic higher-order resummation of such
kinematic logarithms for generic jet hierarchies. In SCET$_+$ additional
intermediate soft/collinear modes are used to resolve jets arising from
additional soft and/or collinear QCD emissions. The resulting factorized cross
sections utilize collinear splitting amplitudes and soft gluon currents and
fully capture spin and color correlations. We discuss how to systematically
combine the different kinematic regimes to obtain a complete description of the
jet phase space. To present its application in a simple context, we use the
case of $e^+e^- \to $3 jets. We then discuss in detail the application to N-jet
processes at hadron colliders, considering representative classes of
hierarchies from which the general case can be built. This includes in
particular multiple hierarchies that are either strongly ordered in angle or
energy or not.Comment: 63 pages, 6 figures, v2: minor typos fixed, Ref. added, v3: journal
versio
|
Factorization and Resummation for Generic Hierarchies between Jets
|
factorization and resummation for generic hierarchies between jets
|
jets lhc. routinely precision searches substructure methods. jets encounters hierarchies momenta dijet masses. logarithms kinematic primarily parton showers. factorization scet collinear scet resummation kinematic logarithms generic hierarchies. scet collinear resolve jets arising collinear emissions. factorized utilize collinear splitting amplitudes gluon currents capture correlations. systematically combine kinematic regimes space. jets. hadron colliders hierarchies built. hierarchies ordered pages minor typos ref. versio
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non_dup
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[] |
42697078
|
10.1007/JHEP08(2016)004
|
Search for the bottom squarks (sbottoms) at the Large Hadron Collider (LHC)
has recently assumed a heightened focus in the hunt for Supersymmetry (SUSY).
The popular framework of the Next-to-Minimal Supersymmetric Standard Model
(NMSSM) could conceive a naturally light sbottom which could easily be
consistent with available constraints from the experiments at the LHC.
Phenomenology of such sbottoms could in principle be as striking as that for a
light top squark (stop) thanks to a rather nontrivial neutralino sector (with
appreciable mixing among the neutral higgsinos and the singlino) that the
scenario gives rise to. Nonetheless, finding such sbottoms might require a
moderately large amount of data ($\sim 300$ $\text{fb}^{-1}$) at the 13 TeV run
of the LHC. A multi-channel analysis establishing a generic depletion of events
in the usual $2b$-$jets$ +$\text{\sout{E}}_T$ final state while registering, in
conjunction, characteristically significant rates in various multi-lepton final
states accompanied by $b$-$jets$ might point not only to the presence of light
sbottom(s) but could also shed crucial light on their compositions and the
(singlino) nature of the lightest SUSY particle (LSP).Comment: 30 pages, 6 figures, 5 tables; matches with published versio
|
Sbottoms of Natural NMSSM at the LHC
|
sbottoms of natural nmssm at the lhc
|
squarks sbottoms hadron collider heightened hunt supersymmetry susy popular supersymmetric nmssm conceive naturally sbottom lhc. phenomenology sbottoms striking squark stop thanks nontrivial neutralino appreciable neutral higgsinos singlino nonetheless sbottoms moderately lhc. establishing generic depletion usual jets sout registering conjunction characteristically lepton accompanied jets sbottom shed crucial compositions singlino lightest susy .comment pages tables matches versio
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[] |
42704988
|
10.1007/JHEP08(2016)006
|
We study the production of a Standard Model Higgs boson in the gluon-fusion
channel at the 13 TeV LHC. Our results are accurate to the next-to-leading
order in QCD, bar for the lack of some two-loop amplitudes, for up to two extra
jets and are matched to the PYTHIA8 Monte Carlo. We address the impact, at the
level of inclusive rates and of differential distributions, of the merging of
samples characterised by different final-state multiplicities, and of the
effects induced by top and bottom masses through heavy-quark loop diagrams. We
find that both the merging and the heavy-quark masses must be included in the
calculation in order to realistically predict observables of experimental
interest.Comment: 22 pages, 7 figures; 4 references and some clarifications added to
the tex
|
Heavy-quark mass effects in Higgs plus jets production
|
heavy-quark mass effects in higgs plus jets production
|
boson gluon fusion lhc. amplitudes extra jets matched pythia monte carlo. inclusive merging characterised multiplicities diagrams. merging realistically predict observables pages clarifications
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[] |
42664848
|
10.1007/JHEP08(2016)008
|
We show how one-loop corrections to scattering amplitudes of scalars and
gauge bosons can be obtained from tree amplitudes in one higher dimension.
Starting with a complete tree-level scattering amplitude of n+2 particles in
five dimensions, one assumes that two of them cannot be "detected" and
therefore an integration over their LIPS is carried out. The resulting object,
function of the remaining n particles, is taken to be four-dimensional by
restricting the corresponding momenta. We perform this procedure in the context
of the tree-level CHY formulation of amplitudes. The scattering equations
obtained in the procedure coincide with those derived by Geyer et al from
ambitwistor constructions and recently studied by two of the authors for
bi-adjoint scalars. They have two sectors of solutions: regular and singular.
We prove that the contribution from regular solutions generically gives rise to
unphysical poles. However, using a BCFW argument we prove that the unphysical
contributions are always homogeneous functions of the loop momentum and can be
discarded. We also show that the contribution from singular solutions turns out
to be homogeneous as well.Comment: 21 pages v.2: ref added, typos fixe
|
One-Loop Corrections from Higher Dimensional Tree Amplitudes
|
one-loop corrections from higher dimensional tree amplitudes
|
amplitudes scalars bosons amplitudes dimension. assumes lips out. restricting momenta. formulation amplitudes. coincide geyer ambitwistor constructions adjoint scalars. sectors singular. generically unphysical poles. bcfw argument unphysical homogeneous discarded. singular turns homogeneous pages typos fixe
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[] |
42702707
|
10.1007/JHEP08(2016)010
|
When conformal field theories (CFTs) are perturbed by marginally relevant
deformations, renormalization group (RG) flows ensue that can be studied with
perturbative methods, at least as long as they remain close to the original
CFT. In this work we study such RG flows in the vicinity of six-dimensional
unitary CFTs. Neglecting effects of scalar operators of dimension two and four,
we use Weyl consistency conditions to prove the $a$-theorem in perturbation
theory, and establish that scale implies conformal invariance. We identify a
quantity that monotonically decreases in the flow to the infrared due to
unitarity, showing that it does not agree with the one studied recently in the
literature on the six-dimensional $\phi^3$ theory.Comment: 16 pages. v2: Mathematica notebook with consistency conditions
included. v3: published version. Added derivation of equations 3.5, 3.13 to
Mathematica noteboo
|
Constraints on Perturbative RG Flows in Six Dimensions
|
constraints on perturbative rg flows in six dimensions
|
conformal cfts perturbed marginally deformations renormalization flows ensue perturbative cft. flows vicinity unitary cfts. neglecting weyl consistency perturbation establish conformal invariance. quantity monotonically infrared unitarity agree pages. mathematica notebook consistency included. version. derivation mathematica noteboo
|
non_dup
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[] |
42703391
|
10.1007/JHEP08(2016)013
|
It was shown recently that boundary terms of conformal anomalies recover the
universal contribution to the entanglement entropy and also play an important
role in the boundary monotonicity theorem of odd-dimensional quantum field
theories. Motivated by these results, we investigate relationships between
boundary anomalies and the stress tensor correlation functions in conformal
field theories. In particular, we focus on how the conformal Ward identity and
the renormalization group equation are modified by boundary central charges.
Renormalized stress tensors induced by boundary Weyl invariants are also
discussed, with examples in spherical and cylindrical geometries.Comment: 25 page
|
Boundary Anomalies and Correlation Functions
|
boundary anomalies and correlation functions
|
conformal anomalies recover universal entanglement monotonicity theories. motivated anomalies conformal theories. conformal ward renormalization charges. renormalized tensors weyl invariants spherical cylindrical
|
non_dup
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[] |
42721159
|
10.1007/JHEP08(2016)015
|
As noted by Witten, compactifying a $d$-dimensional holographic CFT on an
$S^1$ gives a class of $(d-1)$-dimensional confining theories with gravity
duals. The prototypical bulk solution dual to the ground state is a double Wick
rotation of the AdS$_{d+1}$ Schwarzschild black hole known as the AdS soliton.
We generalize such examples by allowing slow variations in the size of the
$S^1$, and thus in the confinement scale. Coefficients governing the second
order response of the system are computed for $3 \le d \le 8$ using a
derivative expansion closely related to the fluid-gravity correspondence. The
primary physical results are that i) gauge-theory flux tubes tend to align
orthogonal to gradients and along the eigenvector of the Hessian with the
lowest eigenvalue, ii) flux tubes aligned orthogonal to gradients are attracted
to gradients for $d \le 6$ but repelled by gradients for $d \ge 7$, iii) flux
tubes are repelled by regions where the second derivative along the tube is
large and positive but are attracted to regions where the eigenvalues of the
Hessian are large and positive in directions orthogonal to the tube, and iv)
for $d > 3$, inhomogeneities act to raise the total energy of the confining
vacuum above its zeroth order value.Comment: 16 pages, 6 figures, typos correcte
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Holographic confinement in inhomogenous backgrounds
|
holographic confinement in inhomogenous backgrounds
|
witten compactifying holographic confining duals. prototypical wick schwarzschild soliton. generalize allowing slow confinement scale. governing closely correspondence. tubes tend align orthogonal gradients eigenvector hessian eigenvalue tubes aligned orthogonal gradients attracted gradients repelled gradients tubes repelled tube attracted eigenvalues hessian directions orthogonal tube inhomogeneities raise confining zeroth pages typos correcte
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non_dup
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[] |
42665625
|
10.1007/JHEP08(2016)017
|
The ATLAS and CMS experiments at the LHC have reported an excess of diphoton
events with invariant mass around 750 GeV, with local significance of about
$3.6 \sigma$ and $2.6 \sigma$, respectively. We entertain the possibility that
this excess is due to new physics, in which case the data suggest a new
particle with 13 TeV LHC production cross section times diphoton branching
ratio of about 5~fb. Interestingly, ATLAS reports a mild preference for a
sizeable width for the signal of about 45 GeV; this result appears consistent
with CMS, and is further supported by improving the compatibility of the 8 TeV
and 13 TeV analyses. We focus on the possibility that the new state is a
scalar. First, we show that, in addition to the new state that is needed
directly to produce the diphoton bump, yet more new particles beyond the
Standard Model are needed to induce diphoton decay rate of the right size.
Second, we note that if the excess is attributed to the Breit-Wigner peak of a
single new state, then the signal strength and width -- taken together --
suggest a total LHC production cross section of order $10^5$ fb. Restricting to
perturbative models without ad-hoc introduction of many new states or exotic
charges, we reach the following conclusions: (i) Gluon-fusion cannot explain
the required large production cross section. (ii) Tree level production from
initial state quarks cannot explain the required branching ratio to two
photons. (iii) Tree level production is constrained by flavor data as well as
LHC Run-I and Tevatron dijet analyses. Insisting on a large width we are led to
suggest that more than one scalar states, nearly degenerate in mass, could
conspire to produce an observed wide bump.Comment: v2: A discussion concerning the flavor constraints in the U(2)
symmetry limit added. Contours in Fig. 1 modified. Conclusions left unchanged
v3: Journal published version. A discussion concerning the interference in
$t\bar t$ searches is adde
|
On a possible large width 750 GeV diphoton resonance at ATLAS and CMS
|
on a possible large width 750 gev diphoton resonance at atlas and cms
|
atlas excess diphoton sigma sigma respectively. entertain excess diphoton branching interestingly atlas mild preference sizeable improving compatibility analyses. scalar. diphoton bump induce diphoton size. excess attributed breit wigner restricting perturbative exotic charges gluon fusion section. quarks branching photons. constrained flavor tevatron dijet analyses. insisting nearly degenerate conspire concerning flavor added. contours fig. modified. unchanged version. concerning interference searches adde
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non_dup
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[] |
42672704
|
10.1007/JHEP08(2016)019
|
We initiate the conformal bootstrap study of Quantum Electrodynamics in $2+1$
space-time dimensions (QED$_{3}$) with $N$ flavors of charged fermions by
focusing on the 4-point function of four monopole operators with the lowest
unit of topological charge. We obtain upper bounds on the scaling dimension of
the doubly-charged monopole operator, with and without assuming other gaps in
the operator spectrum. Intriguingly, we find a (gap-dependent) kink in these
bounds that comes reasonably close to the large $N$ extrapolation of the
scaling dimensions of the singly-charged and doubly-charged monopole operators
down to $N=4$ and $N=6$.Comment: 29 pages plus an appendix, 5 figures, v2 minor improvements, refs
adde
|
Towards Bootstrapping QED$_3$
|
towards bootstrapping qed$_3$
|
initiate conformal bootstrap electrodynamics flavors fermions focusing monopole topological charge. bounds doubly monopole gaps spectrum. intriguingly kink bounds comes reasonably extrapolation singly doubly monopole .comment pages minor improvements refs adde
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[] |
42716308
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10.1007/JHEP08(2016)020
|
The Nekrasov-Shatashvili limit of the refined topological string on toric
Calabi-Yau manifolds and the resulting quantum geometry is studied from a
non-perturbative perspective. The quantum differential and thus the quantum
periods exhibit Stokes phenomena over the combined string coupling and
quantized Kaehler moduli space. We outline that the underlying formalism of
exact quantization is generally applicable to points in moduli space featuring
massless hypermultiplets, leading to non-perturbative band splitting. Our prime
example is local P1xP1 near a conifold point in moduli space. In particular, we
will present numerical evidence that in a Stokes chamber of interest the string
based quantum geometry reproduces the non-perturbative corrections for the
Nekrasov-Shatashvili limit of 4d supersymmetric SU(2) gauge theory at strong
coupling found in the previous part of this series. A preliminary discussion of
local P2 near the conifold point in moduli space is also provided.Comment: 34 pages; v2: Minor correction and refs added; v3: Table 2 modified,
clarifying comment and footnote adde
|
Non-Perturbative Quantum Geometry III
|
non-perturbative quantum geometry iii
|
nekrasov shatashvili refined topological toric calabi manifolds perturbative perspective. exhibit stokes phenomena quantized kaehler moduli space. outline formalism quantization applicable moduli featuring massless hypermultiplets perturbative splitting. prime conifold moduli space. stokes chamber reproduces perturbative nekrasov shatashvili supersymmetric series. preliminary conifold moduli pages minor refs clarifying comment footnote adde
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non_dup
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[] |
42741987
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10.1007/JHEP08(2016)021
|
We investigate origin of three features that are often assumed in analysis of
two-Higgs doublet models: (i) softly broken Z2 symmetry, (ii) CP invariant
Higgs potential, and (iii) degenerated mass spectra. We extend electroweak
gauge symmetry, introducing extra gauge symmetry and extra scalars, and we show
that our models effectively derive two-Higgs dou- blet models at low energy
which naturally hold the three features. We also find that the models can solve
the strong CP problem.Comment: 17 pages, no figures; version published in JHE
|
Emergent two-Higgs doublet models
|
emergent two-higgs doublet models
|
doublet softly broken degenerated spectra. extend electroweak introducing extra extra scalars effectively derive blet naturally hold features. solve pages
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non_dup
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[] |
42686589
|
10.1007/JHEP08(2016)022
|
We study Lorentzian eternal black holes in the Chern-Simons sector of AdS$_3$
higher spin gravity. We probe such black holes using bulk Wilson lines and
motivate new regularity conditions that must be obeyed by the bulk connections
in order for the geometry to be consistent with an interpretation as a
thermofield state in the dual CFT$_2$. We demonstrate that any higher spin
black hole may be placed in a gauge that satisfies these conditions: this is
the Chern-Simons analogue of the construction of Kruskal coordinates that
permit passage through the black hole horizon. We also argue that the Wilson
line provides a higher-spin notion of causality in higher spin gravity that can
be used to associate a Penrose diagram with the black hole. We present some
applications of the formalism, including a study of the time-dependent
entanglement entropy arising from the higher spin black hole interior and
evidence for an emergent AdS$_2$ region in the extremal limit.Comment: 53 pages, 9 figure
|
Eternal Higher Spin Black Holes: a Thermofield Interpretation
|
eternal higher spin black holes: a thermofield interpretation
|
lorentzian eternal holes chern simons gravity. holes wilson motivate regularity obeyed connections thermofield placed satisfies chern simons analogue kruskal permit passage horizon. argue wilson notion causality associate penrose hole. formalism entanglement arising interior emergent extremal pages
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non_dup
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[] |
42697189
|
10.1007/JHEP08(2016)023
|
Pure theories of AdS$_3$ quantum gravity are conjectured to be dual to CFTs
with sparse spectra of light primary operators. The sparsest possible spectrum
consistent with modular invariance includes only black hole states above the
vacuum. Witten conjectured the existence of a family of extremal CFTs, which
realize this spectrum for all admissible values of the central charge. We
consider the quantum corrections to the classical spectrum, and propose a
specific modification of Witten's conjecture which takes into account the
existence of "small" black hole states. These have zero classical horizon area,
with a calculable entropy attributed solely to loop effects. Our conjecture
passes various consistency checks, especially when generalized to include
theories with supersymmetry. In theories with $\mathcal{N}=2$ supersymmetry,
this "near-extremal CFT" proposal precisely evades the no-go results of
Gaberdiel et al.Comment: 41 pages + appendices, 6 figure
|
Small Black Holes and Near-Extremal CFTs
|
small black holes and near-extremal cfts
|
conjectured cfts sparse operators. sparsest modular invariance vacuum. witten conjectured extremal cfts realize admissible charge. propose modification witten conjecture states. horizon calculable attributed solely effects. conjecture passes consistency checks supersymmetry. mathcal supersymmetry extremal proposal precisely evades gaberdiel pages appendices
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non_dup
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[] |
42705029
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10.1007/JHEP08(2016)024
|
The simple correlation among three lepton flavor mixing angles
$(\theta^{}_{12}, \theta^{}_{13}, \theta^{}_{23})$ and the leptonic Dirac
CP-violating phase $\delta$ is conventionally called a sum rule of lepton
flavor mixing, which may be derived from a class of neutrino mass models with
flavor symmetries. In this paper, we consider the solar lepton mixing sum rule
$\theta^{}_{12} \approx \theta^{\nu}_{12} + \theta^{}_{13} \cos \delta$, where
$\theta^\nu_{12}$ stems from a constant mixing pattern in the neutrino sector
and takes the value of $\theta^\nu_{12} = 45^\circ$ for the bi-maximal mixing
(BM), $\theta^\nu_{12} = \tan^{-1}(1/\sqrt{2}) \approx 35.3^\circ$ for the
tri-bimaximal mixing (TBM) or $\theta^\nu_{12} = \tan^{-1}\left[2/(\sqrt{5} +
1)\right] \approx 31.7^\circ$ for the golden-ratio mixing (GR), and investigate
the renormalization-group (RG) running effects on lepton flavor mixing
parameters when this sum rule is assumed at a superhigh-energy scale. For
illustration, we work within the framework of the minimal supersymmetric
standard model (MSSM), and implement the Bayesian approach to explore the
posterior distribution of $\delta$ at the low-energy scale, which becomes quite
broad when the RG running effects are significant. Moreover, we also discuss
the compatibility of the above three mixing scenarios with current neutrino
oscillation data, and observe that radiative corrections can increase such a
compatibility for the BM scenario, resulting in a weaker preference for the TBM
and GR ones.Comment: 20 pages, including 3 tables and 5 figures, matches the published
versio
|
Radiative Corrections to the Solar Lepton Mixing Sum Rule
|
radiative corrections to the solar lepton mixing sum rule
|
lepton flavor angles theta theta theta leptonic dirac violating delta conventionally lepton flavor flavor symmetries. lepton theta approx theta theta delta theta stems theta circ maximal theta sqrt approx circ bimaximal theta sqrt approx circ golden renormalization running lepton flavor superhigh scale. illustration supersymmetric mssm implement bayesian explore posterior delta broad running significant. compatibility scenarios oscillation radiative compatibility weaker preference pages tables matches versio
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42673923
|
10.1007/JHEP08(2016)025
|
Starting with QCD, we derive an effective field theory description for
forward scattering and factorization violation as part of the soft-collinear
effective field theory (SCET) for high energy scattering. These phenomena are
mediated by long distance Glauber gluon exchanges, which are static in time,
localized in the longitudinal distance, where $|t| \ll s$. In hard scattering,
Glauber gluons can induce corrections which invalidate factorization. With
SCET, Glauber exchange graphs can be calculated explicitly, and are distinct
from graphs with soft, collinear, or ultrasoft gluons. We derive a complete
basis of operators which describe the leading power effects of Glauber
exchange. Key ingredients include regulating light-cone rapidity singularities
and subtractions which prevent double counting. Our results include a novel all
orders gauge invariant pure glue soft operator which appears between two
collinear rapidity sectors. The 1-gluon Feynman rule for the soft operator
coincides with the Lipatov vertex, but it also contributes to emissions with
$\ge 2$ soft gluons. Our Glauber operator basis is derived using tree level and
one-loop matching calculations from full QCD to SCET. The rapidity RGE yields
gluon Reggeization at the amplitude level, and gives the BFKL equation for the
soft and collinear functions in the forward scattering cross section. We derive
an explicit rule for when eikonalization is valid, and provide a direct
connection to the picture of multiple Wilson lines crossing a shockwave. In
hard scattering operators Glauber subtractions for soft and collinear loop
diagrams ensure that we are not sensitive to the directions for soft and
collinear Wilson lines. Conversely, certain Glauber interactions can be
absorbed into these soft and collinear Wilson lines by taking them to be in
specific directions. We also discuss criteria for factorization violation.Comment: 207 pages, 39 figures, v2: typos fixed, fwd.fact.proof simplified,
journal versio
|
An Effective Field Theory for Forward Scattering and Factorization
Violation
|
an effective field theory for forward scattering and factorization violation
|
derive factorization violation collinear scet scattering. phenomena glauber gluon exchanges localized longitudinal glauber gluons induce invalidate factorization. scet glauber explicitly collinear ultrasoft gluons. derive glauber exchange. ingredients regulating cone rapidity singularities subtractions prevent counting. orders glue collinear rapidity sectors. gluon feynman coincides lipatov contributes gluons. glauber matching scet. rapidity gluon reggeization bfkl collinear section. derive eikonalization valid connection picture wilson crossing shockwave. glauber subtractions collinear diagrams ensure directions collinear wilson lines. conversely glauber absorbed collinear wilson directions. factorization pages typos fwd.fact.proof simplified versio
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non_dup
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[] |
42672181
|
10.1007/JHEP08(2016)026
|
One of the methods to calculate tree-level multi-gluon scattering amplitudes
is to use the Berends-Giele recursion relation involving off-shell currents or
off-shell amplitudes, if working in the light cone gauge. As shown in recent
works using the light-front perturbation theory, solutions to these recursions
naturally collapse into gauge invariant and gauge-dependent components, at
least for some helicity configurations. In this work, we show that such
structure is helicity independent and emerges from analytic properties of
matrix elements of Wilson line operators, where the slope of the straight gauge
path is shifted in a certain complex direction. This is similar to the
procedure leading to the Britto-Cachazo-Feng-Witten (BCFW) recursion, however
we apply a complex shift to the Wilson line slope instead of the external
momenta. While in the original BCFW procedure the boundary integrals over the
complex shift vanish for certain deformations, here they are non-zero and are
equal to the off-shell amplitudes. The main result can thus be summarized as
follows: we derive a decomposition of a helicity-fixed off-shell current into
gauge invariant component given by a matrix element of a straight Wilson line
plus a reminder given by a sum of products of gauge invariant and gauge
dependent quantities. We give several examples realizing this relation,
including the five-point next-to-MHV helicity configuration.Comment: 23 pages, version accepted for JHE
|
Off-shell amplitudes as boundary integrals of analytically continued
Wilson line slope
|
off-shell amplitudes as boundary integrals of analytically continued wilson line slope
|
gluon amplitudes berends giele recursion involving currents amplitudes cone gauge. front perturbation recursions naturally collapse helicity configurations. helicity emerges analytic wilson straight shifted direction. britto cachazo feng witten bcfw recursion wilson momenta. bcfw integrals vanish deformations amplitudes. summarized derive decomposition helicity straight wilson reminder quantities. realizing helicity pages
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non_dup
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[] |
42728911
|
10.1007/JHEP08(2016)028
|
We explore various non-supersymmetric type II string vacua constructed based
on asymmetric orbifolds of tori with vanishing cosmological constant at the one
loop. The string vacua we present are modifications of the models studied in
arXiv:1512.05155[hep-th], of which orbifold group is just generated by a single
element. We especially focus on two types of modifications: (i) the orbifold
twists include different types of chiral reflections not necessarily removing
massless Rarita-Schwinger fields in the 4-dimensional space-time, (ii) the
orbifold twists do not include the shift operator. We further discuss the
unitarity and stability of constructed non-supersymmetric string vacua, with
emphasizing the common features of them.Comment: 1+33 pages, no figure; v2 1+35 pages, several definitions are
clarified, typos corrected, to be published in JHE
|
More on Non-supersymmetric Asymmetric Orbifolds with Vanishing
Cosmological Constant
|
more on non-supersymmetric asymmetric orbifolds with vanishing cosmological constant
|
explore supersymmetric vacua asymmetric orbifolds tori vanishing cosmological loop. vacua modifications orbifold element. modifications orbifold twists chiral reflections necessarily removing massless rarita schwinger orbifold twists operator. unitarity supersymmetric vacua emphasizing pages pages definitions clarified typos corrected
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non_dup
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[] |
42731092
|
10.1007/JHEP08(2016)030
|
We study lepton flavor violation in a class of supersymmetric models with
light sgoldstino - scalar superpartner of Goldstone fermions responsible for
spontaneous supersymmetry breaking. Sgoldstino couplings to the Standard Model
(SM) fermions are determined by the MSSM soft terms and, in general, provide
with flavor violation in this sector. Sgoldstino admixture to the lightest
Higgs boson results in changes of its coupling constants and, in particular,
leads to lepton flavor-violating decay $h\to\tau\mu$ of the Higgs resonance. We
discuss viability and phenomenological consequences of this scenario.Comment: 29 pages, 14 figure
|
Lepton flavor-violating decays of the Higgs boson from sgoldstino mixing
|
lepton flavor-violating decays of the higgs boson from sgoldstino mixing
|
lepton flavor violation supersymmetric sgoldstino superpartner goldstone fermions spontaneous supersymmetry breaking. sgoldstino couplings fermions mssm flavor violation sector. sgoldstino admixture lightest boson lepton flavor violating resonance. viability phenomenological consequences pages
|
non_dup
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[] |
42721971
|
10.1007/JHEP08(2016)031
|
We point out that the $s$-channel unitarity of QCD imposes meaningful
constraints on a possible form of the QCD Reggeon Field Theory. We show that
neither the BFKL nor JIMWLK nor Braun's Hamiltonian satisfy the said
constraints. In a toy, zero transverse dimensional case we construct a model
that satisfies the analogous constraint and show that at infinite energy it
indeed tends to a "black disk limit" as opposed to the model with triple
Pomeron vertex only, routinely used as a toy model in the literature.Comment: 34 pages, 9 Figs; Minor clarifications on the concept of unitarity
are added. JHEP versio
|
QCD unitarity constraints on Reggeon Field Theory
|
qcd unitarity constraints on reggeon field theory
|
unitarity imposes meaningful reggeon theory. neither bfkl jimwlk braun satisfy said constraints. satisfies analogous infinite tends opposed triple pomeron routinely pages figs minor clarifications unitarity added. jhep versio
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42720742
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10.1007/JHEP08(2016)032
|
It is shown how cosmological perturbation theory arises from a fully
quantized perturbative theory of quantum gravity. Central for the derivation is
a non-perturbative concept of gauge-invariant local observables by means of
which perturbative invariant expressions of arbitrary order are generated. In
particular, in the linearised theory, first order gauge-invariant observables
familiar from cosmological perturbation theory are recovered. Explicit
expressions of second order quantities are presented as well.Comment: 18 page
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Cosmological perturbation theory and quantum gravity
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cosmological perturbation theory and quantum gravity
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cosmological perturbation arises quantized perturbative gravity. derivation perturbative observables perturbative expressions generated. linearised observables familiar cosmological perturbation recovered. expressions quantities
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42732105
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10.1007/JHEP08(2016)033
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We derive general constraints on the mixing of heavy Seesaw neutrinos with
the SM fields from a global fit to present flavour and electroweak precision
data. We explore and compare both a completely general scenario, where the
heavy neutrinos are integrated out without any further assumption, and the more
constrained case were only 3 additional heavy states are considered. The latter
assumption implies non-trivial correlations in order to reproduce the correct
neutrino masses and mixings as observed by oscillation data and thus some
qualitative differences can be found with the more general scenario. The
relevant processes analyzed in the global fit include searches for Lepton
Flavour Violating (LFV) decays, probes of the universality of weak
interactions, CKM unitarity bounds and electroweak precision data. In
particular, a comparative and detailed study of the present and future
sensitivity of the different LFV experiments is performed. We find a mild
$1-2\sigma$ preference for non-zero heavy neutrino mixing of order 0.03-0.04 in
the electron and tau sectors. At the $2\sigma$ level we derive bounds on all
mixings ranging from 0.1 to 0.01 with the notable exception of the $e-\mu$
sector with a more stringent bound of 0.005 from the $\mu \to e \gamma$
process.Comment: 29 pages, 29 figures. v2: minor typos corrected. Version accepted for
publication in JHE
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Global constraints on heavy neutrino mixing
|
global constraints on heavy neutrino mixing
|
derive seesaw neutrinos flavour electroweak precision data. explore neutrinos constrained considered. trivial reproduce mixings oscillation qualitative scenario. searches lepton flavour violating decays probes universality unitarity bounds electroweak precision data. comparative performed. mild sigma preference sectors. sigma derive bounds mixings ranging notable exception stringent gamma pages figures. minor typos corrected. publication
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42711299
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10.1007/JHEP08(2016)034
|
We study the duality between four-dimensional N=2 compactifications of
heterotic and type IIA string theories. Via adiabatic fibration of the duality
in six dimensions, type IIA string theory compactified on a K3-fibred
Calabi-Yau threefold has a potential heterotic dual compactification. This
adiabatic picture fails whenever the K3 fibre degenerates into multiple
components over points in the base of the fibration. Guided by monodromy, we
identify such degenerate K3 fibres as solitons generalizing the NS5-brane in
heterotic string theory. The theory of degenerations of K3 surfaces can then be
used to find which solitons can be present on the heterotic side. Similar to
small instanton transitions, these solitons escort singular transitions between
different Calabi-Yau threefolds. Starting from well-known examples of
heterotic--type IIA duality, such transitions can take us to type IIA
compactifications with unknown heterotic duals.Comment: 76 pages, 8 figures; v2: minor change
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Heterotic-Type IIA Duality and Degenerations of K3 Surfaces
|
heterotic-type iia duality and degenerations of k3 surfaces
|
duality compactifications heterotic theories. adiabatic fibration duality compactified fibred calabi threefold heterotic compactification. adiabatic picture fails whenever fibre degenerates fibration. guided monodromy degenerate fibres solitons generalizing brane heterotic theory. degenerations solitons heterotic side. instanton solitons escort singular calabi threefolds. heterotic duality compactifications unknown heterotic pages minor
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42691115
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10.1007/JHEP08(2016)036
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We make precise determinations of the leading scaling dimensions and operator
product expansion (OPE) coefficients in the 3d Ising, $O(2)$, and $O(3)$ models
from the conformal bootstrap with mixed correlators. We improve on previous
studies by scanning over possible relative values of the leading OPE
coefficients, which incorporates the physical information that there is only a
single operator at a given scaling dimension. The scaling dimensions and OPE
coefficients obtained for the 3d Ising model, $(\Delta_{\sigma},
\Delta_{\epsilon},\lambda_{\sigma\sigma\epsilon},
\lambda_{\epsilon\epsilon\epsilon}) = (0.5181489(10), 1.412625(10),
1.0518537(41), 1.532435(19))$, give the most precise determinations of these
quantities to date.Comment: 17 pages, 7 figures, and one movie: https://youtu.be/6pw8Hkly1y
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Precision Islands in the Ising and $O(N)$ Models
|
precision islands in the ising and $o(n)$ models
|
precise determinations ising conformal bootstrap correlators. scanning incorporates dimension. ising delta sigma delta epsilon lambda sigma sigma epsilon lambda epsilon epsilon epsilon precise determinations quantities pages movie https youtu.be hkly
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42739799
|
10.1007/JHEP08(2016)037
|
We investigate the impact of the direct searches for SUSY at LHC Run I on the
naturalness of the Next-to-Minimal Supersymmetric Standard Model (NMSSM). For
this end, we first scan the vast parameter space of the NMSSM to get the region
where the fine tuning measures $\Delta_Z$ and $\Delta_h$ at the electroweak
scale are less than about 50, then we implement by simulations the constraints
of the direct searches on the parameter points in the region. Our results
indicate that although the direct search experiments are effective in excluding
the points, the parameter intervals for the region and also the minimum reaches
of $\Delta_Z$ and $\Delta_h$ are scarcely changed by the constraints, which
implies that the fine tuning of the NMSSM does not get worse after LHC Run I.
Moreover, based on the results we propose a natural NMSSM scenario where the
lightest neutralino $\tilde{\chi}_1^0$ as the dark matter (DM) candidate is
Higgsino-dominated. In this scenario, $\Delta_Z$ and $\Delta_h$ may be as low
as 2 without conflicting with any experimental constraints, and intriguingly
$\tilde{\chi}_1^0$ can easily reach the measured DM relic density due to its
significant Singlino component. We exhibit the features of the scenario which
distinguish it from the other natural SUSY scenario, including the properties
of its neutralino-chargino sector and scalar top quark sector. We emphasize
that the scenario can be tested either through searching for $3 l + E_T^{miss}$
signal at 14 TeV LHC or through future DM direct detection experiments.Comment: 26 pages, 5 figure
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Natural NMSSM after LHC Run I and the Higgsino dominated dark matter
scenario
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natural nmssm after lhc run i and the higgsino dominated dark matter scenario
|
searches susy naturalness supersymmetric nmssm scan vast nmssm fine tuning delta delta electroweak implement searches region. excluding intervals reaches delta delta scarcely changed fine tuning nmssm worse propose nmssm lightest neutralino tilde candidate higgsino dominated. delta delta conflicting intriguingly tilde relic singlino component. exhibit distinguish susy neutralino chargino sector. emphasize searching miss pages
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42718606
|
10.1007/JHEP08(2016)038
|
Simplified Models are a useful way to characterize new physics scenarios for
the LHC. Particle decays are often represented using non-renormalizable
operators that involve the minimal number of fields required by symmetries.
Generalizing to a wider class of decay operators allows one to model a variety
of final states. This approach, which we dub the $n$-body extension of
Simplified Models, provides a unifying treatment of the signal phase space
resulting from a variety of signals. In this paper, we present the first
application of this framework in the context of multijet plus missing energy
searches. The main result of this work is a global performance study with the
goal of identifying which set of observables yields the best discriminating
power against the largest Standard Model backgrounds for a wide range of signal
jet multiplicities. Our analysis compares combinations of one, two and three
variables, placing emphasis on the enhanced sensitivity gain resulting from
non-trivial correlations. Utilizing boosted decision trees, we compare and
classify the performance of missing energy, energy scale and energy structure
observables. We demonstrate that including an observable from each of these
three classes is required to achieve optimal performance. This work
additionally serves to establish the utility of $n$-body extended Simplified
Models as a diagnostic for unpacking the relative merits of different search
strategies, thereby motivating their application to new physics signatures
beyond jets and missing energy.Comment: 31 + 28 pages, 11 + 10 figures; v2 references added, journal versio
|
Dissecting Jets and Missing Energy Searches Using $n$-body Extended
Simplified Models
|
dissecting jets and missing energy searches using $n$-body extended simplified models
|
simplified characterize scenarios lhc. decays renormalizable involve symmetries. generalizing wider states. simplified unifying signals. multijet missing searches. goal identifying observables discriminating backgrounds multiplicities. compares combinations placing emphasis trivial correlations. utilizing boosted trees classify missing observables. observable performance. additionally serves establish utility simplified diagnostic unpacking merits thereby motivating signatures jets missing pages versio
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42662419
|
10.1007/JHEP08(2016)039
|
We present predictions for the associated production of a Higgs boson at
NLO+PS accuracy, including the effect of anomalous interactions between the
Higgs and gauge bosons. We present our results in different frameworks, one in
which the interaction vertex between the Higgs boson and Standard Model $W$ and
$Z$ bosons is parameterized in terms of general Lorentz structures, and one in
which Electroweak symmetry breaking is manifestly linear and the resulting
operators arise through a six-dimensional effective field theory framework. We
present analytic calculations of the Standard Model and Beyond the Standard
Model contributions, and discuss the phenomenological impact of the higher
order pieces. Our results are implemented in the NLO Monte Carlo program MCFM,
and interfaced to shower Monte Carlos through the {\sc Powheg} box framework.Comment: 24 pages, 10 figures, v2 matches published version, includes fixes to
figures and text and added discussion of effect of the EFT operators on EW
parameter
|
Higher Order QCD predictions for Associated Higgs production with
anomalous couplings to gauge bosons
|
higher order qcd predictions for associated higgs production with anomalous couplings to gauge bosons
|
boson anomalous bosons. frameworks boson bosons parameterized lorentz electroweak breaking manifestly arise framework. analytic phenomenological pieces. implemented monte carlo mcfm interfaced shower monte carlos powheg pages matches fixes
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42729608
|
10.1007/JHEP08(2016)040
|
We make an explicit link between the cubic interactions of off-shell fields
and the on-shell three-point amplitudes in four dimensions. Both the cubic
interactions and the on-shell three-point amplitudes had been independently
classified in the literature, but their relation has not been made explicit.
The aim of this note is to provide such a relation and discuss similarities and
differences of their constructions. For the completeness of our analysis, we
also derive the covariant form of all parity-odd massless vertices.Comment: Published version in JHE
|
Spinor-Helicity Three-Point Amplitudes from Local Cubic Interactions
|
spinor-helicity three-point amplitudes from local cubic interactions
|
cubic amplitudes dimensions. cubic amplitudes independently classified explicit. similarities constructions. completeness derive covariant parity massless
|
non_dup
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[] |
42699437
|
10.1007/JHEP08(2016)041
|
We derive an explicit bound on the dimension of the lightest charged state in
two dimensional conformal field theories with a global abelian symmetry. We
find that the bound scales with $c$ and provide examples that parametrically
saturate this bound. We also prove than any such theory must contain a state
with charge-to-mass ratio above a minimal lower bound. We comment on the
implications for charged states in three dimensional theories of gravity.Comment: 33 pages, 1 figure; v2: additional refs and comments adde
|
Universal Bounds on Charged States in 2d CFT and 3d Gravity
|
universal bounds on charged states in 2d cft and 3d gravity
|
derive lightest conformal abelian symmetry. parametrically saturate bound. bound. comment pages refs comments adde
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[] |
42684032
|
10.1007/JHEP08(2016)043
|
String theory axions are interesting candidates for fields whose potential
might be controllable over super-Planckian field ranges and therefore as
possible candidates for inflatons in large field inflation. Axion monodromy
scenarios are setups where the axion shift symmetry is broken by some effect
such that the axion can traverse a large number of periods potentially leading
to super-Planckian excursions. We study such scenarios in type IIA string
theory where the axion shift symmetry is broken by background fluxes. In
particular we calculate the backreaction of the energy density induced by the
axion vacuum expectation value on its own field space metric. We find universal
behaviour for all the compactifications studied where up to a certain critical
axion value there is only a small backreaction effect. Beyond the critical
value the backreaction is strong and implies that the proper field distance as
measured by the backreacted metric increases at best logarithmically with the
axion vev, thereby placing strong limitations on extending the field distance
any further. The critical axion value can be made arbitrarily large by the
choice of fluxes. However the backreaction of these fluxes on the axion field
space metric ensures a precise cancellation such that the proper field distance
up to the critical axion value is flux independent and remains sub-Planckian.
We also study an axion alignment scenario for type IIA compactifications on a
twisted torus with four fundamental axions mixing to leave an axion with an
effective decay constant which is flux dependent. There is a choice of fluxes
for which the alignment parameter is unconstrained by tadpoles and can in
principle lead to a parametrically enhanced effective decay constant. However
we show that these fluxes backreact on the fundamental decay constants so as to
precisely cancel any enhancement.Comment: 30 pages. v2: added references, expanded summary sectio
|
Backreacted Axion Field Ranges in String Theory
|
backreacted axion field ranges in string theory
|
axions candidates controllable super planckian ranges candidates inflatons inflation. axion monodromy scenarios setups axion broken axion traverse potentially super planckian excursions. scenarios axion broken fluxes. backreaction axion expectation metric. universal compactifications axion backreaction effect. backreaction proper backreacted logarithmically axion thereby placing limitations extending further. axion arbitrarily fluxes. backreaction fluxes axion ensures precise cancellation proper axion planckian. axion alignment compactifications twisted torus axions leave axion dependent. fluxes alignment unconstrained tadpoles parametrically constant. fluxes backreact precisely cancel pages. expanded sectio
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[] |
42740997
|
10.1007/JHEP08(2016)044
|
We study the formation and evolution of topological defects in an aligned
axion model with multiple Peccei-Quinn scalars, where the QCD axion is realized
by a certain combination of the axions with decay constants much smaller than
the conventional Peccei-Quinn breaking scale. When the underlying U(1)
symmetries are spontaneously broken, the aligned structure in the axion field
space exhibits itself as a complicated string-wall network in the real space.
We find that the string-wall network likely survives until the QCD phase
transition if the number of the Peccei-Quinn scalars is greater than two. The
string-wall system collapses during the QCD phase transition, producing a
significant amount of gravitational waves in the nano-Hz range at present. The
typical decay constant is constrained to be below O(100) TeV by the pulsar
timing observations, and the constraint will be improved by a factor of 2 in
the future SKA observations.Comment: 23 pages, 7 figure
|
Topological Defects and nano-Hz Gravitational Waves in Aligned Axion
Models
|
topological defects and nano-hz gravitational waves in aligned axion models
|
topological defects aligned axion peccei quinn scalars axion realized axions peccei quinn breaking scale. symmetries spontaneously broken aligned axion exhibits complicated space. survives peccei quinn scalars two. collapses producing gravitational nano present. constrained pulsar timing pages
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42736325
|
10.1007/JHEP08(2016)046
|
We investigate the existence of solutions with 16 residual supersymmetries to
Type IIB supergravity on a space-time of the form $AdS_6 \times S^2$ warped
over a two-dimensional Riemann surface $\Sigma$. The $SO(2,5) \times SO(3)$
isometry extends to invariance under the exceptional Lie superalgebra $F(4)$.
In the present paper, we construct the general Ansatz compatible with these
symmetries, derive the corresponding reduced BPS equations, and obtain their
complete local solution in terms of two locally holomorphic functions ${\cal
A}_\pm$ on $\Sigma$, subject to certain positivity and regularity conditions.
Globally, $({\cal A}_+, {\cal A}_-)$ are allowed to be multiple-valued on
$\Sigma$ and be holomorphic sections of a holomorphic bundle over $\Sigma$ with
structure group contained in $SU(1,1) \times { C}$. Globally regular solutions
are expected to provide the near-horizon geometry of $(p,q)$ 5-brane and
7-brane webs which are holographic duals to five-dimensional conformal field
theories. A preliminary analysis of the positivity and regularity conditions
will be presented here, leaving the construction of globally regular solutions
to a subsequent paper.Comment: 61 pages, no figures; v2: typo fixed; v3: integration constant c_6
fixe
|
Warped $AdS_6\times S^2$ in Type IIB supergravity I: Local solutions
|
warped $ads_6\times s^2$ in type iib supergravity i: local solutions
|
residual supersymmetries supergravity warped riemann sigma isometry extends invariance exceptional superalgebra ansatz compatible symmetries derive locally holomorphic sigma positivity regularity conditions. globally valued sigma holomorphic holomorphic bundle sigma globally horizon brane brane webs holographic duals conformal theories. preliminary positivity regularity leaving globally pages typo fixe
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non_dup
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42684692
|
10.1007/JHEP08(2016)047
|
In any gravitational theory and in a wide class of background space-times, we
argue that there exists a simple, yet profound, relation between the on-shell
Euclidean gravitational action and the on-shell Euclidean action of probes. The
probes can be, for instance, charged particles or branes. The relation is
tightly related to the thermodynamic nature of gravity. We provide precise
checks of the relation in several examples, which include both asymptotically
flat and asymptotically AdS space-times, with particle, D-brane and M-brane
probes. Perfect consistency is found in all cases, including in a highly
non-trivial example including \alpha'-corrections.Comment: 45 pages, 1 figure; v2: list of references updated; v3: typos
corrected, a few explanations and a remark on bubbling geometries added,
published versio
|
Gravity and On-Shell Probe Actions
|
gravity and on-shell probe actions
|
gravitational argue profound euclidean gravitational euclidean probes. probes branes. tightly thermodynamic gravity. precise checks asymptotically asymptotically brane brane probes. perfect consistency trivial alpha pages updated typos corrected explanations remark bubbling geometries versio
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42694298
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10.1007/JHEP08(2016)048
|
We develop a new method for computing the holographic retarded propagator in
generic (non-)equilibrium states using the state/geometry map. We check that
our method reproduces the thermal spectral function given by the Son-Starinets
prescription. The time-dependence of the spectral function of a relevant scalar
operator is studied in a class of non-equilibrium states. The latter are
represented by AdS-Vaidya geometries with an arbitrary parameter characterising
the timescale for the dual state to transit from an initial thermal equilibrium
to another due to a homogeneous quench. For long quench duration, the spectral
function indeed follows the thermal form at the instantaneous effective
temperature adiabatically, although with a slight initial time delay and a bit
premature thermalisation. At shorter quench durations, several new
non-adiabatic features appear: (i) time-dependence of the spectral function is
seen much before than that in the effective temperature (advanced
time-dependence), (ii) a big transfer of spectral weight to frequencies greater
than the initial temperature occurs at an intermediate time (kink formation)
and (iii) new peaks with decreasing amplitudes but in greater numbers appear
even after the effective temperature has stabilised (persistent oscillations).
We find four broad routes to thermalisation for lower values of spatial
momenta. At higher values of spatial momenta, kink formations and persistent
oscillations are suppressed, and thermalisation time decreases. The general
thermalisation pattern is globally top-down, but a closer look reveals
complexities.Comment: 1+38 pages, 26 figures, captions improved; version to appear in JHE
|
Time-dependence of the holographic spectral function: Diverse routes to
thermalisation
|
time-dependence of the holographic spectral function: diverse routes to thermalisation
|
holographic retarded propagator generic map. check reproduces starinets prescription. states. vaidya geometries characterising timescale transit homogeneous quench. quench instantaneous adiabatically slight delay premature thermalisation. shorter quench durations adiabatic advanced kink decreasing amplitudes stabilised persistent oscillations broad routes thermalisation momenta. momenta kink formations persistent oscillations suppressed thermalisation decreases. thermalisation globally closer look reveals pages captions
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non_dup
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42741296
|
10.1007/JHEP08(2016)049
|
In this paper we describe 4-dimensional gravity coupled to scalar and Maxwell
fields by the Einstein-Katz action, that is, the covariant version of the
"Gamma-Gamma $-$ Gamma-Gamma" part of the Hilbert action supplemented by the
divergence of a generalized "Katz vector". We consider static solutions of
Einstein's equations, parametrized by some integration constants, which
describe an ensemble of asymptotically AdS black holes. Instead of the usual
Dirichlet boundary conditions, which aim at singling out a specific solution
within the ensemble, we impose that the variation of the action vanishes on
shell for the broadest possible class of solutions. We will see that, when a
long-range scalar "hair" is present, only sub-families of the solutions can
obey that criterion. The Katz-Bicak-Lynden-Bell ("KBL") superpotential built on
this (generalized) vector will then give straightforwardly the Noether charges
associated with the spacetime symmetries (that is, in the static case, the
mass). Computing the action on shell, we will see next that the solutions which
obey the imposed variational principle, and with Noether charges given by the
KBL superpotential, satisfy the Gibbs relation, the Katz vectors playing the
role of "counterterms". Finally, we show on the specific example of dyonic
black holes that the sub-class selected by our variational principle satisfies
the first law of thermodynamics when their mass is defined by the KBL
superpotential.Comment: Accepted for publication by JHE
|
Einstein-Katz action, variational principle, Noether charges and the
thermodynamics of AdS-black holes
|
einstein-katz action, variational principle, noether charges and the thermodynamics of ads-black holes
|
maxwell einstein katz covariant gamma gamma gamma gamma hilbert supplemented divergence katz einstein parametrized ensemble asymptotically holes. usual dirichlet singling ensemble impose vanishes broadest solutions. hair families obey criterion. katz bicak lynden bell superpotential built straightforwardly noether charges spacetime symmetries obey imposed variational noether charges superpotential satisfy gibbs katz playing counterterms dyonic holes variational satisfies thermodynamics publication
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