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5256521
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10.1007/JHEP09(2012)079
|
In the name of supersymmetric double field theory, superstring effective
actions can be reformulated into simple forms. They feature a pair of vielbeins
corresponding to the same spacetime metric, and hence enjoy double local
Lorentz symmetries. In a manifestly covariant manner --with regard to O(D,D)
T-duality, diffeomorphism, B-field gauge symmetry and the pair of local Lorentz
symmetries-- we incorporate R-R potentials into double field theory. We take
them as a single object which is in a bi-fundamental spinorial representation
of the double Lorentz groups. We identify cohomological structure relevant to
the field strength. A priori, the R-R sector as well as all the fermions are
O(D,D) singlet. Yet, gauge fixing the two vielbeins equal to each other
modifies the O(D,D) transformation rule to call for a compensating local
Lorentz rotation, such that the R-R potential may turn into an O(D,D) spinor
and T-duality can flip the chirality exchanging type IIA and IIB
supergravities.Comment: 1+37 pages, no figure; Structure reorganized, References added, To
appear in JHEP. cf. Gong Show of Strings 2012
(http://wwwth.mpp.mpg.de/members/strings/strings2012/strings_files/program/Talks/Thursday/Gongshow/Lee.pdf
|
Ramond-Ramond Cohomology and O(D,D) T-duality
|
ramond-ramond cohomology and o(d,d) t-duality
|
name supersymmetric superstring reformulated forms. vielbeins spacetime enjoy lorentz symmetries. manifestly covariant manner regard duality diffeomorphism lorentz symmetries incorporate potentials theory. spinorial lorentz groups. cohomological strength. priori fermions singlet. fixing vielbeins modifies call compensating lorentz spinor duality flip chirality exchanging pages reorganized jhep. gong strings files talks thursday gongshow lee.pdf
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non_dup
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[] |
5253790
|
10.1007/JHEP09(2012)080
|
We study the N=1 supersymmetric cascading gauge theory found in type IIB
string theory on p regular and M fractional D3-branes at the tip of the
conifold, using the T-dual type IIA description. We reproduce the
supersymmetric vacuum structure of this theory, and show that the IIA analog of
the non-supersymmetric state found by Kachru, Pearson and Verlinde in the IIB
description is metastable in string theory, but the barrier for tunneling to
the supersymmetric vacuum goes to infinity in the field theory limit. We also
comment on the N=2 supersymmetric gauge theory corresponding to regular and
fractional D3-branes on a near-singular K3, and clarify the origin of the
cascade in this theory.Comment: 43 pages, 18 figures, harvma
|
IIA Perspective On Cascading Gauge Theory
|
iia perspective on cascading gauge theory
|
supersymmetric cascading fractional branes conifold description. reproduce supersymmetric analog supersymmetric kachru pearson verlinde metastable barrier tunneling supersymmetric goes infinity limit. comment supersymmetric fractional branes singular clarify cascade pages harvma
|
non_dup
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[] |
5255969
|
10.1007/JHEP09(2012)082
|
Large scale structure surveys will likely become the next leading
cosmological probe. In our universe, matter perturbations are large on short
distances and small at long scales, i.e. strongly coupled in the UV and weakly
coupled in the IR. To make precise analytical predictions on large scales, we
develop an effective field theory formulated in terms of an IR effective fluid
characterized by several parameters, such as speed of sound and viscosity.
These parameters, determined by the UV physics described by the Boltzmann
equation, are measured from N-body simulations. We find that the speed of sound
of the effective fluid is c_s^2 10^(-6) and that the viscosity contributions
are of the same order. The fluid describes all the relevant physics at long
scales k and permits a manifestly convergent perturbative expansion in the size
of the matter perturbations \delta(k) for all the observables. As an example,
we calculate the correction to the power spectrum at order \delta(k)^4. The
predictions of the effective field theory are found to be in much better
agreement with observation than standard cosmological perturbation theory,
already reaching percent precision at this order up to a relatively short scale
k \sim 0.24 h/Mpc.Comment: v2: typos corrected, JHEP published versio
|
The Effective Field Theory of Cosmological Large Scale Structures
|
the effective field theory of cosmological large scale structures
|
surveys cosmological probe. universe perturbations distances i.e. weakly precise formulated sound viscosity. boltzmann simulations. sound viscosity order. describes permits manifestly convergent perturbative perturbations delta observables. delta cosmological perturbation reaching percent precision typos corrected jhep versio
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non_dup
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[] |
2256453
|
10.1007/JHEP09(2012)084
|
We study refined topological string theory in the presence of orientifolds by
counting second-quantized BPS states in M-theory. This leads us to propose a
new integrality condition for both refined and unrefined topological strings
when orientifolds are present. We define the SO(2N) refined Chern-Simons theory
which computes refined open string amplitudes for branes wrapping Seifert
three-manifolds. We use the SO(2N) refined Chern-Simons theory to compute new
invariants of torus knots that generalize the Kauffman polynomials. At large N,
the SO(2N) refined Chern-Simons theory on the three-sphere is dual to refined
topological strings on an orientifold of the resolved conifold, generalizing
the Gopakumar-Sinha-Vafa duality. Finally, we use the (2,0) theory to define
and solve refined Chern-Simons theory for all ADE gauge groups
|
Orientifolds and the Refined Topological String
|
orientifolds and the refined topological string
|
refined topological orientifolds counting quantized theory. propose integrality refined unrefined topological strings orientifolds present. refined chern simons computes refined amplitudes branes wrapping seifert manifolds. refined chern simons invariants torus knots generalize kauffman polynomials. refined chern simons sphere refined topological strings orientifold resolved conifold generalizing gopakumar sinha vafa duality. solve refined chern simons
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non_dup
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[] |
5237392
|
10.1007/JHEP09(2012)086
|
Varying the Standard Model (SM) fermion Yukawa couplings universally by a
generic positive scale factor ($F_{Yu}$), we study the phenomenological fit to
the current available experimental results for the Higgs boson search at hadron
colliders. We point out that the Higgs production cross section and its decay
branching ratio to $\gamma\gamma$ can be varied oppositely by $F_{Yu}$ to make
their product almost invariant. Thus, our scenario and the SM Higgs are
indistinguishable in the inclusive $H\to \gamma\gamma$ channel. The current
measurements on direct Yukawa coupling strength in the $H\to b\bar{b}/\tau\tau$
channel are not precise enough to fix the scale factor $F_{Yu}$. The most
promising is the vector-boson-fusion channel in which the CMS has already
observed possible suppression effect on the Yukawa couplings. Further more, the
global $\chi^2$ fit of the experimental data can get the optimal value by
introducing a suppression factor $F_{Yu}\sim1/2$ on the SM Yukawa couplings.Comment: 16 pages, 12 figures, 5 tables, update analysis is supplemente
|
Constraints on the Universal Varying Yukawa Couplings: from SM-like to
Fermiophobic
|
constraints on the universal varying yukawa couplings: from sm-like to fermiophobic
|
fermion yukawa couplings universally generic phenomenological boson hadron colliders. branching gamma gamma varied oppositely invariant. indistinguishable inclusive gamma gamma channel. yukawa precise promising boson fusion suppression yukawa couplings. introducing suppression yukawa pages tables update supplemente
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non_dup
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[] |
5251230
|
10.1007/JHEP09(2012)087
|
In a previous paper, arXiv:1204.3096, we have shown that the fully dynamical
three-point correlation functions of BMN operators are identical at the tree
level in the planar limit of perturbative field theory and, on the string
theory side, calculated by means of the Dobashi-Yoneya three string vertex in
the Penrose limit. Here we present a one-loop calculation of the same quantity
both on the field-theory and string-theory side, where a complete identity
between the two results is demonstrated.Comment: 14 pages, 2 figures, references adde
|
Three-point functions of BMN operators at weak and strong coupling II.
One loop matching
|
three-point functions of bmn operators at weak and strong coupling ii. one loop matching
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planar perturbative dobashi yoneya penrose limit. quantity pages adde
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non_dup
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[] |
24765756
|
10.1007/JHEP09(2012)088
|
We study the d-wave holographic superconductors (the d-wave model proposed in
[arXiv:1003.2991[hep-th]]) immersed in constant external magnetic fields by
using the analytic matching method and numerical computation. In the probe
limit, we calculate the spatially dependent condensate solution in the presence
of the magnetism and find that the expression for the upper critical magnetic
field satisfies the relation given in the Ginzburg-Landau theory. The result
shows that the upper critical field gradually increases to its maximum value
$B_{c2}$ at absolute zero temperature T=0, while vanishing at the critical
temperature $T=T_c$. Moving away from the probe limit, we investigate the
effect of spacetime backreaction on the critical temperature and the upper
critical magnetic field. The magnetic fields as well as the electric fields
acting as gravitational sources reduce the critical temperature of the
superconductor and actually result in a dyonic black hole solution to the
leading order. We obtain the expression for the upper critical magnetic field
up to $\mathcal{O}(\kappa^2)$ order. The analytic result is consistent with the
numerical findings.Comment: 23 pages, 7 figures. typos corrected. to appear in JHEP. arXiv admin
note: text overlap with arXiv:1105.433
|
d-Wave holographic superconductors with backreaction in external
magnetic fields
|
d-wave holographic superconductors with backreaction in external magnetic fields
|
holographic superconductors immersed analytic matching computation. spatially condensate magnetism satisfies ginzburg landau theory. gradually vanishing moving away spacetime backreaction field. acting gravitational superconductor dyonic order. mathcal kappa order. analytic pages figures. typos corrected. jhep. admin overlap
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non_dup
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[] |
8780988
|
10.1007/JHEP09(2012)090
|
Working to lowest non-trivial order in fermions, we consider the
four-derivative order corrected Lagrangian and supersymmetry transformations of
the Euclidean Bagger-Lambert-Gustavsson theory. By demonstrating supersymmetric
invariance of the Lagrangian we determine all numerical coefficients in the
system. In addition, the supersymmetry algebra is shown to close on the scalar
and gauge fields. We also comment on the extension to Lorentzian and other
non-Euclidean $\mathcal{N}=8$ 3-algebra theories.Comment: 23 page
|
Higher Derivative BLG: Lagrangian and Supersymmetry Transformations
|
higher derivative blg: lagrangian and supersymmetry transformations
|
trivial fermions corrected lagrangian supersymmetry transformations euclidean bagger lambert gustavsson theory. demonstrating supersymmetric invariance lagrangian system. supersymmetry fields. comment lorentzian euclidean mathcal
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non_dup
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[] |
5253893
|
10.1007/JHEP09(2012)096
|
We construct a 3+1 dimensional holographic model dual to a parity violating
hydrodynamic system in 2+1 dimensions. Our model contains gravitational and
electrodynamic Chern-Simons terms coupled to a neutral pseudo scalar $\theta$,
and a potential composed of quadratic and quartic terms in $\theta$. The
background is a charged black brane. We study the hydrodynamics to first order
in spacetime derivatives near the probe limit of the pseudo scalar, by
extracting the transport coefficients from the scalar, vector, and tensor modes
of bulk perturbations. We study two mechanisms for breaking the parity of the
boundary fluid: the parity is either spontaneously broken by the nonzero vev of
the dual pseudo scalar operator, or by the pseudo scalar source on the
boundary. The resulting transport coefficients have unusual behaviors compared
to those in ordinary materials.Comment: Latex, 1+34 pages, 13 figures. v2 typos corrected, 4 references
added, a paragraph discussing ref [37] added in Section 5. v3 to match the
published versio
|
Novel Parity Violating Transport Coefficients in 2+1 Dimensions from
Holography
|
novel parity violating transport coefficients in 2+1 dimensions from holography
|
holographic parity violating hydrodynamic dimensions. gravitational electrodynamic chern simons neutral pseudo theta composed quadratic quartic theta brane. hydrodynamics spacetime derivatives pseudo extracting perturbations. breaking parity parity spontaneously broken nonzero pseudo pseudo boundary. unusual behaviors ordinary latex pages figures. typos corrected paragraph discussing match versio
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non_dup
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[] |
2256950
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10.1007/JHEP09(2012)097
|
The double diffractive Higgs production at central rapidity is formulated in
terms of the fusion of two AdS gravitons/Pomerons first introduced by Brower,
Polchinski, Strassler and Tan in elastic scattering. Here we propose a simple
self-consistent holographic framework capable of providing phenomenologically
compelling estimates of diffractive cross sections at the LHC. As in the
traditional weak coupling approach, we anticipate that several phenomenological
parameters must be tested and calibrated through factorization for a
self-consistent description of other diffractive process such as total cross
sections, deep inelastic scattering and heavy quark production in the central
region.Comment: 53 pages, 8 figure
|
Diffractive Higgs Production by AdS Pomeron Fusion
|
diffractive higgs production by ads pomeron fusion
|
diffractive rapidity formulated fusion gravitons pomerons brower polchinski strassler elastic scattering. propose holographic capable phenomenologically compelling diffractive lhc. traditional anticipate phenomenological calibrated factorization diffractive inelastic pages
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non_dup
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[] |
5251412
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10.1007/JHEP09(2012)100
|
We study extremal black hole solutions to four dimensional N=2 supergravity
based on a cubic symmetric scalar manifold. Using the coset construction
available for these models, we define the first order flow equations implied by
the corresponding nilpotency conditions on the three-dimensional scalar momenta
for the composite non-BPS class of multi-centre black holes. As an application,
we directly solve these equations for the single-centre subclass, and write the
general solution in a manifestly duality covariant form. This includes all
single-centre under-rotating non-BPS solutions, as well as their
non-interacting multi-centre generalisations.Comment: 31 pages, v2: Discussion of the quadratic constraint clarified,
references added, typos corrected, published versio
|
Duality covariant non-BPS first order systems
|
duality covariant non-bps first order systems
|
extremal supergravity cubic manifold. coset implied nilpotency momenta composite holes. solve subclass manifestly duality covariant form. rotating interacting pages quadratic clarified typos corrected versio
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non_dup
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[] |
2132572
|
10.1007/JHEP09(2012)102
|
In an attempt to maximize General Gauge Mediated parameter space, I propose
simple models in which gauginos and scalars are generated from disconnected
mechanisms. In my models Dirac gauginos are generated through the supersoft
mechanism, while independent R-symmetric scalar masses are generated through
operators involving non-zero messenger supertrace. I propose several new
methods for generating negative messenger supertraces which result in viable
positive mass squareds for MSSM scalars. The resultant spectra are novel,
compressed and may contain light fermionic SM adjoint fields.Comment: 16 pages 3 figure
|
Dirac Gauginos, Negative Supertraces and Gauge Mediation
|
dirac gauginos, negative supertraces and gauge mediation
|
attempt maximize propose gauginos scalars disconnected mechanisms. dirac gauginos supersoft involving messenger supertrace. propose generating messenger supertraces viable squareds mssm scalars. resultant compressed fermionic adjoint pages
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non_dup
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[] |
5258851
|
10.1007/JHEP09(2012)103
|
We consider modifications of the nonlinear Schrodinger model (NLS) to look at
the recently introduced concept of quasi-integrability. We show that such
models possess an infinite number of quasi-conserved charges which present
intriguing properties in relation to very specific space-time parity
transformations. For the case of two-soliton solutions where the fields are
eigenstates of this parity, those charges are asymptotically conserved in the
scattering process of the solitons. Even though the charges vary in time their
values in the far past and the far future are the same. Such results are
obtained through analytical and numerical methods, and employ adaptations of
algebraic techniques used in integrable field theories. Our findings may have
important consequences on the applications of these models in several areas of
non-linear science. We make a detailed numerical study of the modified NLS
potential of the form V = |psi|^(2(2+epsilon)), with epsilon being a
perturbation parameter. We perform numerical simulations of the scattering of
solitons for this model and find a good agreement with the results predicted by
the analytical considerations. Our paper shows that the quasi-integrability
concepts recently proposed in the context of modifications of the sine-Gordon
model remain valid for perturbations of the NLS model.Comment: 39 pages, 12 figure
|
The concept of quasi-integrability for modified non-linear Schrodinger
models
|
the concept of quasi-integrability for modified non-linear schrodinger models
|
modifications schrodinger look quasi integrability. possess infinite quasi conserved charges intriguing parity transformations. soliton eigenstates parity charges asymptotically conserved solitons. charges vary same. employ adaptations algebraic integrable theories. consequences science. epsilon epsilon perturbation parameter. solitons considerations. quasi integrability concepts modifications sine gordon valid perturbations pages
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non_dup
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[] |
2254082
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10.1007/JHEP09(2012)105
|
Quantum critical behavior in 2+1 dimensions is established via holographic
methods in a 5+1-dimensional Einstein gravity theory with gauge potential form
fields of rank 1 and 2. These fields are coupled to one another via a
tri-linear Chern-Simons term with strength k. The quantum phase transition is
physically driven by the expulsion of the electric charge from inside the black
brane horizon to the outside, where it gets carried by the gauge fields which
acquire charge thanks to the Chern-Simons interaction. At a critical value
k=k_c, zero temperature, and any finite value of the magnetic field, the IR
behavior is governed by a near-horizon Lifshitz geometry. The associated
dynamical scaling exponent depends on the magnetic field. For k<k_c, the flow
towards low temperature is governed by a Reissner-Nordstrom-like black brane
whose charge and entropy density are non-vanishing at zero temperature. For k >
k_c, the IR flow is towards the purely magnetic brane in AdS_6. Its
near-horizon geometry is AdS_4 \times R^2, so that the entropy density vanishes
quadratically with temperature, and all charge is carried by the gauge fields
outside of the horizon.Comment: 37 pages v2: reference added and cosmetic improvement
|
Charge Expulsion from Black Brane Horizons, and Holographic Quantum
Criticality in the Plane
|
charge expulsion from black brane horizons, and holographic quantum criticality in the plane
|
holographic einstein chern simons physically expulsion brane horizon gets acquire thanks chern simons interaction. governed horizon lifshitz geometry. exponent field. governed reissner nordstrom brane vanishing temperature. purely brane horizon vanishes quadratically pages cosmetic
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non_dup
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[] |
8781128
|
10.1007/JHEP09(2012)107
|
The long awaited discovery of a new light scalar at the LHC opens up a new
era of studies of the Higgs sector in the SM and its extensions. In this paper
we discuss the consequences of the observation of a light Higgs boson with the
mass and rates reported by the ATLAS and CMS collaborations on the parameter
space of the phenomenological MSSM, including also the so far unsuccessful LHC
searches for the heavier Higgs bosons and supersymmetric particle partners in
missing transverse momentum as well as the constraints from B physics and dark
matter. We explore the various regimes of the MSSM Higgs sector depending on
the parameters MA and tan beta and show that only two of them are still allowed
by all present experimental constraints: the decoupling regime where there is
only one light and standard--like Higgs boson and the supersymmetric regime in
which there are light supersymmetric particle partners affecting the decay
properties of the Higgs boson, in particular its di-photon and invisible
decays.Comment: 21 pages, 9 figures v2 - Discussion of the impact of LHC data
extended, scan statistics increased, a few figures added and typos correcte
|
The Higgs sector of the phenomenological MSSM in the light of the Higgs
boson discovery
|
the higgs sector of the phenomenological mssm in the light of the higgs boson discovery
|
awaited discovery opens extensions. consequences boson atlas collaborations phenomenological mssm unsuccessful searches heavier bosons supersymmetric partners missing matter. explore regimes mssm beta decoupling boson supersymmetric supersymmetric partners affecting boson invisible pages scan typos correcte
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non_dup
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[] |
5255384
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10.1007/JHEP09(2012)108
|
The spectrum of particles in supersymmetric Yang-Mills theory is expected to
contain a spin 1/2 bound state of gluons and gluinos, the gluino-glue particle.
We study the mass of this particle in softly broken supersymmetric Yang-Mills
theory on a lattice by means of numerical simulations. The main focus is the
estimation of finite size effects. We extrapolate the mass first to the
infinite volume and then to the limit of a vanishing gluino mass. The results
indicate that finite size effects are tolerable on lattices of moderate size,
and that remaining deviations from supersymmetry are probably due to finite
lattice spacing effects
|
The gluino-glue particle and finite size effects in supersymmetric
Yang-Mills theory
|
the gluino-glue particle and finite size effects in supersymmetric yang-mills theory
|
supersymmetric mills gluons gluinos gluino glue particle. softly broken supersymmetric mills simulations. effects. extrapolate infinite vanishing gluino mass. tolerable lattices moderate deviations supersymmetry probably spacing
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non_dup
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[] |
33995702
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10.1007/JHEP09(2012)112
|
The production of the prompt charm mesons D0, D+, D∗+, and their antiparticles, was measured with the ALICE detector in Pb-Pb collisions at the LHC, at a centre-of-mass energy √sNN = 2.76 TeV per nucleon- nucleon collision. The pt-differential production yields in the range 2 < pt < 16 GeV/c at central rapidity, |y| < 0.5, were used to calculate the nuclear modification factor RAA with respect to a proton-proton reference obtained from the cross section measured at √s = 7 TeV and scaled to √s = 2.76 TeV. For the three meson species, RAA shows a suppression by a factor 3–4, for transverse momenta larger than 5 GeV/c in the 20% most central collisions. The suppression is reduced for peripheral collisions
|
Suppression of high transverse momentum D mesons in central Pb-Pb collisions at psNN = 2.76TeV
|
suppression of high transverse momentum d mesons in central pb-pb collisions at psnn = 2.76tev
|
prompt charm mesons antiparticles alice collisions √snn nucleon nucleon collision. rapidity modification proton proton scaled tev. meson suppression momenta collisions. suppression peripheral collisions
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non_dup
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[] |
5251755
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10.1007/JHEP09(2012)114
|
We compute holographic one- and two-point functions of critical
higher-curvature gravity in four dimensions. The two most important operators
are the stress tensor and its logarithmic partner, sourced by ordinary massless
and by logarithmic non-normalisable gravitons, respectively. In addition, the
logarithmic gravitons source two ordinary operators, one with spin-one and one
with spin-zero. The one-point function of the stress tensor vanishes for all
Einstein solutions, but has a non-zero contribution from logarithmic gravitons.
The two-point functions of all operators match the expectations from a
three-dimensional logarithmic conformal field theory.Comment: 35 pages; v2: typos corrected, added reference; v3: shorter
introduction, minor changes in the text in section 3, added reference;
published versio
|
Holographic two-point functions for 4d log-gravity
|
holographic two-point functions for 4d log-gravity
|
holographic curvature dimensions. logarithmic partner sourced ordinary massless logarithmic normalisable gravitons respectively. logarithmic gravitons ordinary zero. vanishes einstein logarithmic gravitons. match expectations logarithmic conformal pages typos corrected shorter minor versio
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non_dup
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2254358
|
10.1007/JHEP09(2012)117
|
Most recombination-style jet algorithms cluster soft gluons in a complex way.
This leads to correlations in the soft gluon phase space and introduces
logarithmic corrections to jet cross sections. The leading Abelian clustering
logarithms occur at least at next-to leading logarithm (NLL) in the exponent of
the distribution, and we show that new clustering effects contributing at NLL
likely arise at each order. Therefore we find that it is unlikely that
clustering logs can be resummed to NLL. Clustering logarithms make the anti-kT
algorithm theoretically preferred, for which they are power suppressed. They
can arise in Abelian and non-Abelian terms, and we calculate the Abelian
clustering logarithms at two loops for the jet mass distribution using the
Cambridge/Aachen and kT algorithms, including jet radius dependence, which
extends previous results. We find that previously identified logarithms from
clustering effects can be naturally thought of as a class of non-global
logarithms (NGLs), which have traditionally been tied to non-Abelian
correlations in soft gluon emission.Comment: 22 pages + appendices, 8 figure
|
Abelian Non-Global Logarithms from Soft Gluon Clustering
|
abelian non-global logarithms from soft gluon clustering
|
recombination style gluons way. gluon introduces logarithmic sections. abelian clustering logarithms logarithm exponent clustering contributing arise order. unlikely clustering logs resummed nll. clustering logarithms theoretically preferred suppressed. arise abelian abelian abelian clustering logarithms loops aachen extends results. logarithms clustering naturally thought logarithms ngls traditionally tied abelian gluon pages appendices
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non_dup
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[] |
8781473
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10.1007/JHEP09(2012)123
|
We analyze the properties of the Higgs candidate with mass ~ 125 GeV
discovered by the CMS and ATLAS Collaborations, constraining the possible
deviations of its couplings from those of a Standard Model Higgs boson. The
CMS, ATLAS and Tevatron data are compatible with Standard Model couplings to
massive gauge bosons and fermions, and disfavour several types of composite
Higgs models unless their couplings resemble those in the Standard Model. We
show that the couplings of the Higgs candidate are consistent with a linear
dependence on particle masses, scaled by the electroweak scale ~ 246 GeV, the
power law and the mass scale both having uncertainties ~ 20%.Comment: 22 pages, 9 figures, v2 incorporates experimental data released
during July 2012 and corrected (and improved) treatment of mass dependence of
coupling
|
Global Analysis of the Higgs Candidate with Mass ~ 125 GeV
|
global analysis of the higgs candidate with mass ~ 125 gev
|
analyze candidate discovered atlas collaborations constraining deviations couplings boson. atlas tevatron compatible couplings massive bosons fermions disfavour composite unless couplings resemble model. couplings candidate scaled electroweak .comment pages incorporates released corrected
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non_dup
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[] |
6207592
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10.1007/JHEP09(2012)124
|
We develop a general recipe for constructing orthogonal bases for the
calculation of color structures appearing in QCD for any number of partons and
arbitrary Nc. The bases are constructed using hermitian gluon projectors onto
irreducible subspaces invariant under SU(Nc). Thus, each basis vector is
associated with an irreducible representation of SU(Nc). The resulting
multiplet bases are not only orthogonal, but also minimal for finite Nc. As a
consequence, for calculations involving many colored particles, the number of
basis vectors is reduced significantly compared to standard approaches
employing overcomplete bases. We exemplify the method by constructing multiplet
bases for all processes involving a total of 6 external colored partons.Comment: 50 pages, 2 figure
|
Orthogonal multiplet bases in SU(Nc) color space
|
orthogonal multiplet bases in su(nc) color space
|
recipe constructing orthogonal bases appearing partons bases hermitian gluon projectors irreducible subspaces irreducible multiplet bases orthogonal involving colored employing overcomplete bases. exemplify constructing multiplet bases involving colored pages
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non_dup
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[] |
5252741
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10.1007/JHEP09(2012)126
|
We demonstrate by performing a global fit on Higgs signal strength data that
large invisible branching ratios Br_{inv} for a Standard Model (SM) Higgs
particle are currently consistent with the experimental hints of a scalar
resonance at the mass scale m_h ~ 124 GeV. For this mass scale, we find
Br_{inv} < 0.64 (95 % CL) from a global fit to individual channel signal
strengths supplied by ATLAS, CMS and the Tevatron collaborations. Novel tests
that can be used to improve the prospects of experimentally discovering the
existence of a Br_{inv} with future data are proposed. These tests are based on
the combination of all visible channel Higgs signal strengths, and allow us to
examine the required reduction in experimental and theoretical errors in this
data that would allow a more significantly bounded invisible branching ratio to
be experimentally supported. We examine in some detail how our conclusions and
method are affected when a scalar resonance at this mass scale has couplings
deviating from the SM ones.Comment: 32pp, 15 figures v2: JHEP version, ref added & comment added after
Eq.
|
Probing for Invisible Higgs Decays with Global Fits
|
probing for invisible higgs decays with global fits
|
performing invisible branching hints gev. strengths supplied atlas tevatron collaborations. prospects experimentally discovering proposed. visible strengths examine invisible branching experimentally supported. examine couplings deviating jhep comment
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non_dup
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[] |
2130078
|
10.1007/JHEP09(2012)127
|
Four dimensional N=2 generalized superconformal field theory can be defined
by compactifying six dimensional (0,2) theory on a Riemann surface with regular
punctures. In previous studies, gauge coupling constant space is identified
with the moduli space of punctured Riemann surface M_{g,n}. We show that the
weakly coupled gauge group description corresponds to a stable nodal curve, and
the coupling space is actually the Deligne-Mumford compactification
\bar{M}_{g,n}. We also give an algorithm to determine the weakly coupled gauge
group and matter content in any duality frame.Comment: v2, reorganizing the materials, discussions on 2d CFT is remove
|
N=2 Generalized Superconformal Quiver Gauge Theory
|
n=2 generalized superconformal quiver gauge theory
|
superconformal compactifying riemann punctures. moduli punctured riemann weakly nodal deligne mumford compactification weakly duality reorganizing discussions remove
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non_dup
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[] |
5252932
|
10.1007/JHEP09(2012)131
|
In the framework of the superconformal tensor calculus for 4D N=2
supergravity, locally supersymmetric actions are often constructed using the
linear multiplet. We provide a superform formulation for the linear multiplet
and derive the corresponding action functional using the ectoplasm method (also
known as the superform approach to the construction of supersymmetric
invariants). We propose a new locally supersymmetric action which makes use of
a deformed linear multiplet. The novel feature of this multiplet is that it
corresponds to the case of a gauged central charge using a one-form potential
not annihilated by the central charge (unlike the standard N=2 vector
multiplet). Such a gauge one-form can be chosen to describe a variant nonlinear
vector-tensor multiplet. As a byproduct of our construction, we also find a
variant realization of the tensor multiplet in supergravity where one of the
auxiliaries is replaced by the field strength of a gauge three-form.Comment: 31 pages; v3: minor corrections and typos fixed, version to appear in
JHE
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The linear multiplet and ectoplasm
|
the linear multiplet and ectoplasm
|
superconformal calculus supergravity locally supersymmetric multiplet. superform formulation multiplet derive ectoplasm superform supersymmetric invariants propose locally supersymmetric deformed multiplet. multiplet gauged annihilated unlike multiplet variant multiplet. byproduct variant realization multiplet supergravity auxiliaries replaced pages minor typos
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non_dup
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[] |
5252756
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10.1007/JHEP09(2012)133
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We solve what is quite likely the simplest model of quantum gravity, the
worldsheet theory of an infinitely long, free bosonic string in Minkowski
space. Contrary to naive expectations, this theory is non-trivial. We
illustrate this by constructing its exact factorizable S-matrix. Despite its
simplicity, the theory exhibits many of the salient features expected from more
mature quantum gravity models, including the absence of local off-shell
observables, a minimal length, a maximum achievable (Hagedorn) temperature, as
well as (integrable relatives of) black holes. All these properties follow from
the exact S-matrix. We show that the complete finite volume spectrum can be
reconstructed analytically from this S-matrix with the help of the
thermodynamic Bethe Ansatz. We argue that considered as a UV complete
relativistic two-dimensional quantum field theory the model exhibits a new type
of renormalization group flow behavior, "asymptotic fragility". Asymptotically
fragile flows do not originate from a UV fixed point.Comment: 32+4 pages, 1 figure, v2: typos fixed, published versio
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Solving the Simplest Theory of Quantum Gravity
|
solving the simplest theory of quantum gravity
|
solve simplest worldsheet infinitely bosonic minkowski space. contrary naive expectations trivial. illustrate constructing factorizable matrix. simplicity exhibits salient mature observables achievable hagedorn integrable relatives holes. matrix. reconstructed analytically thermodynamic bethe ansatz. argue relativistic exhibits renormalization asymptotic fragility asymptotically fragile flows originate pages typos versio
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non_dup
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144256938
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10.1007/JHEP09(2012)135
|
We study systematically the BPS spectra of N = 2 SYM coupled to half - hypermultiplets, the basic example being E7 SYM coupled to a half-hyper in the 56 irrepr. In order to do this, we determine the BPS quivers with superpotential of such N = 2 models using a new technique we introduce. The computation of the BPS spectra in the various chambers is then reduced to the Representation Theory of the resulting quivers. We use the quiver description to study the BPS spectrum at both strong and weak coupling. The following models are discussed in detail: SU(6) SYM coupled to a 1/2 20, SO(12) SYM coupled to a 1/2 32, and E7 SYM coupled to a 1/2 56. For models with gauge group SU(2) × SO(2n) and matter in the 1/2 (2, 2n) we find strongly coupled chambers with a BPS spectrum consisting of just finitely many hypermultiplets. © SISSA 2012
|
Half-hypers and quivers
|
half-hypers and quivers
|
systematically hypermultiplets hyper irrepr. quivers superpotential introduce. chambers quivers. quiver coupling. chambers consisting finitely hypermultiplets. sissa
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non_dup
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[] |
2081997
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10.1007/JHEP09(2012)136
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We study supersymmetric and super Poincar\'e invariant deformations of
ten-dimensional super Yang-Mills theory and of its dimensional reductions. We
describe all infinitesimal super Poincar\'e invariant deformations of equations
of motion of ten-dimensional super Yang-Mills theory and its reduction to a
point; we discuss the extension of them to formal deformations. Our methods are
based on homological algebra, in particular, on the theory of L-infinity and
A-infinity algebras. The exposition of this theory as well as of some basic
facts about Lie algebra homology and Hochschild homology is given in
appendices.Comment: New results added. 111 page
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Supersymmetric Deformations of Maximally Supersymmetric Gauge Theories
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supersymmetric deformations of maximally supersymmetric gauge theories
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supersymmetric super poincar deformations super mills reductions. infinitesimal super poincar deformations super mills formal deformations. homological infinity infinity algebras. exposition facts homology hochschild homology added.
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non_dup
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9261266
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10.1007/JHEP09(2012)138
|
The infrared divergences of massless n-parton scattering amplitudes can be
derived from the anomalous dimension of n-jet operators in soft-collinear
effective theory. Up to three-loop order, the latter has been shown to have a
very simple structure: it contains pairwise color-dipole interactions among the
external partons, governed by the cusp anomalous dimension and a logarithm of
the kinematic invariants s_{ij}, plus a possible three-loop correlation
involving four particles, which is described by a yet unknown function of
conformal cross ratios of kinematic invariants. This function is constrained by
two-particle collinear limits and by the known behavior of amplitudes in the
high-energy limit. We construct a class of relatively simple functions
satisfying these constraints. We also extend the analysis to four-loop order,
finding that three additional four-particle correlations and a single
five-particle correlation appear, which again are governed by functions of
conformal cross ratios. Our results suggest that the dipole conjecture, which
states that only two-particle color-dipole correlations appear in the anomalous
dimension, may need to be generalized. We present a weaker form of the
conjecture, stating that to all orders in perturbation theory corrections to
the dipole formula are governed by functions of conformal cross ratios, and are
O(1/N_c^2) suppressed relative to the dipole term. If true, this conjecture
implies that the cusp anomalous dimension obeys Casimir scaling to all orders
in perturbation theory.Comment: 21 pages, 1 figur
|
Structure of Infrared Singularities of Gauge-Theory Amplitudes at Three
and Four Loops
|
structure of infrared singularities of gauge-theory amplitudes at three and four loops
|
infrared divergences massless parton amplitudes anomalous collinear theory. pairwise dipole partons governed cusp anomalous logarithm kinematic invariants involving unknown conformal kinematic invariants. constrained collinear amplitudes limit. satisfying constraints. extend governed conformal ratios. dipole conjecture dipole anomalous generalized. weaker conjecture stating orders perturbation dipole governed conformal suppressed dipole term. conjecture cusp anomalous obeys casimir orders perturbation pages figur
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non_dup
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24941194
|
10.1007/JHEP09(2013)002
|
We propose a simple renormalizable model of baryogenesis and asymmetric dark
matter generation at the electroweak phase transition. Our setup utilizes the
two Higgs doublet model plus two complex gauge singlets, the lighter of which
is stable dark matter. The dark matter is charged under a global symmetry that
is broken in the early universe but restored during the electroweak phase
transition. Because the ratio of baryon and dark matter asymmetries is
controlled by model parameters, the dark matter need not be light. Thus, new
force carriers are unnecessary and the symmetric dark matter abundance can be
eliminated via Higgs portal interactions alone. Our model places a rough upper
bound on the dark matter mass, and has implications for direct detection
experiments and particle colliders.Comment: 9 pages, 4 figure
|
Electroweak Cogenesis
|
electroweak cogenesis
|
propose renormalizable baryogenesis asymmetric electroweak transition. setup utilizes doublet singlets lighter matter. broken universe restored electroweak transition. baryon asymmetries light. carriers unnecessary abundance eliminated portal alone. places rough pages
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non_dup
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24943106
|
10.1007/JHEP09(2013)005
|
We study the $P-V$ criticality and phase transition in the extended phase
space of charged Gauss-Bonnet black holes in anti-de Sitter space, where the
cosmological constant appears as a dynamical pressure of the system and its
conjugate quantity is the thermodynamic volume of the black hole. The black
holes can have a Ricci flat ($k=0$), spherical ($k=1$), or hyperbolic ($k=-1$)
horizon. We find that for the Ricci flat and hyperbolic Gauss-Bonnet black
holes, no $P-V$ criticality and phase transition appear, while for the black
holes with a spherical horizon, even when the charge of the black hole is
absent, the $P-V$ criticality and the small black hole/large black hole phase
transition will appear, but it happens only in $d=5$ dimensions; when the
charge does not vanish, the $P-V$ criticality and the small black hole/large
phase transition always appear in $d=5$ dimensions; in the case of $d\ge 6$, to
have the $P-V$ criticality and the small black hole/large black hole phase
transition, there exists an upper bound for the parameter
$b=\widetilde{\alpha}|Q|^{-2/(d-3)}$, where $\tilde {\alpha}$ is the
Gauss-Bonnet coefficient and $Q$ is the charge of the black hole. We calculate
the critical exponents at the critical point and find that for all cases, they
are the same as those in the van der Waals liquid-gas system.Comment: 23 pages,9 figure
|
P-V criticality in the extended phase space of Gauss-Bonnet black holes
in AdS space
|
p-v criticality in the extended phase space of gauss-bonnet black holes in ads space
|
criticality gauss bonnet holes sitter cosmological conjugate quantity thermodynamic hole. holes ricci spherical hyperbolic horizon. ricci hyperbolic gauss bonnet holes criticality holes spherical horizon absent criticality happens vanish criticality criticality widetilde alpha tilde alpha gauss bonnet hole. exponents waals pages
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non_dup
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24943371
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10.1007/JHEP09(2013)007
|
We discuss the isolation of prompt photons in hadronic collisions by means of
narrow isolation cones and the QCD computation of the corresponding cross
sections. We reconsider the occurence of large perturbative terms with
logarithmic dependence on the cone size and their impact on the fragmentation
scale dependence. We cure the apparent perturbative violation of unitarity for
small cone sizes, which had been noticed earlier in next-to-leading-order (NLO)
calculations, by resumming the leading logarithmic dependence on the cone size.
We discuss possible implications regarding the implementation of some hollow
cone variants of the cone criterion, which simulate the experimental difficulty
to impose isolation inside the region filled by the electromagnetic shower that
develops in the calorimeter.Comment: 19 pages, 2 figures, 4 table
|
Isolating Prompt Photons with Narrow Cones
|
isolating prompt photons with narrow cones
|
isolation prompt photons hadronic collisions narrow isolation cones sections. reconsider occurence perturbative logarithmic cone fragmentation dependence. cure apparent perturbative violation unitarity cone sizes noticed resumming logarithmic cone size. hollow cone variants cone criterion simulate difficulty impose isolation filled electromagnetic shower develops pages
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non_dup
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[] |
24797677
|
10.1007/JHEP09(2013)008
|
Within the context of the weakly coupled E8 x E8 heterotic string, we study
the hidden sector of heterotic standard model compactifications to
four-dimensions. Specifically, we present a class of hidden sector vector
bundles - composed of the direct sum of line bundles only - that, together with
an effective bulk five-brane, renders the heterotic standard model entirely N=1
supersymmetric. Two explicit hidden sectors are constructed and analyzed in
this context; one with the gauge group E7 x U(1) arising from a single line
bundle and a second with an SO(12) x U(1) x U(1) gauge group constructed from
the direct sum of two line bundles. Each hidden sector bundle is shown to
satisfy all requisite physical constraints within a finite region of the Kahler
cone. We also clarify that the first Chern class of the line bundles need not
be even in our context, as has often been imposed in the model building
literature.Comment: 32 pages, 4 figures. v2: corrected misplaced hyphen in the second
author's name. v3: citations and clarifications adde
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Supersymmetric Hidden Sectors for Heterotic Standard Models
|
supersymmetric hidden sectors for heterotic standard models
|
weakly heterotic hidden heterotic compactifications dimensions. hidden bundles composed bundles brane renders heterotic entirely supersymmetric. hidden sectors arising bundle bundles. hidden bundle satisfy requisite kahler cone. clarify chern bundles imposed pages figures. corrected misplaced hyphen name. citations clarifications adde
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non_dup
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[] |
9262390
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10.1007/JHEP09(2013)011
|
We compute the partition function of five-dimensional abelian gauge theory on
a five-torus T5 with a general flat metric using the Dirac method of quantizing
with constraints. We compare this with the partition function of a single
fivebrane compactified on S1 times T5, which is obtained from the six-torus
calculation of Dolan and Nappi. The radius R1 of the circle S1 is set to the
dimensionful gauge coupling constant g^2= 4\pi^2 R1. We find the two partition
functions are equal only in the limit where R1 is small relative to T5, a limit
which removes the Kaluza-Klein modes from the 6d sum. This suggests the 6d
N=(2,0) tensor theory on a circle is an ultraviolet completion of the 5d gauge
theory, rather than an exact quantum equivalence.Comment: v4, 37 pages, published versio
|
Partition Functions for Maxwell Theory on the Five-torus and for the
Fivebrane on S1XT5
|
partition functions for maxwell theory on the five-torus and for the fivebrane on s1xt5
|
partition abelian torus dirac quantizing constraints. partition fivebrane compactified torus dolan nappi. circle dimensionful partition removes kaluza klein sum. circle ultraviolet completion pages versio
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non_dup
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[] |
24938313
|
10.1007/JHEP09(2013)014
|
Covariantly smeared sources are commonly used in lattice QCD to enhance the
projection onto the ground state. Here we investigate the dependence of their
shape on the gauge field background and find that the presence of localized
concentrations of magnetic field can lead to strong distortions which reduce
the smearing radii achievable by iterative smearing prescriptions. In
particular, as $a\to 0$, iterative procedures like Jacobi smearing require
increasingly large iteration counts in order to reach physically-sized smearing
radii $r_{sm}\sim$ 0.5 fm, and the resulting sources are strongly distorted. To
bypass this issue, we propose a covariant smearing procedure (``free-form
smearing'') that allows us to create arbitrarily shaped sources, including in
particular Gaussians of arbitrary radius.Comment: 1+15 pages, 7 figures (24 pdf images
|
The Shape of Covariantly Smeared Sources in Lattice QCD
|
the shape of covariantly smeared sources in lattice qcd
|
covariantly smeared commonly enhance projection state. localized distortions smearing radii achievable iterative smearing prescriptions. iterative jacobi smearing increasingly iteration counts physically sized smearing radii distorted. bypass propose covariant smearing smearing create arbitrarily shaped gaussians pages
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non_dup
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[] |
24932496
|
10.1007/JHEP09(2013)015
|
Hawking showed that the radiation emitted from a classical collapsing shell
is thermal. Here, we show that a semiclassical collapsing shell emits radiation
that is only approximately thermal, with small but significant deviations. The
most important difference is the presence of small off-diagonal elements in the
radiation density matrix with a magnitude of order $1/\sqrt{S_{BH}}$, $S_{BH}$
being the Bekenstein-Hawking entropy of the incipient black hole. The
off-diagonal elements store the correlations between the collapsing shell and
the emitted radiation and allow information to continuously leak from the
collapsed body. The rate of escape of information is initially very small,
increasing to order one by the Page time, when the black hole has lost half its
original entropy. We show that, until the Page time, the radiation is almost
exactly thermal and that, from this time on, it begins to purify at an
increasing rate.Comment: 37 page
|
Restoring predictability in semiclassical gravitational collapse
|
restoring predictability in semiclassical gravitational collapse
|
hawking emitted collapsing thermal. semiclassical collapsing emits deviations. diagonal sqrt bekenstein hawking incipient hole. diagonal store collapsing emitted continuously leak collapsed body. escape initially lost entropy. begins purify
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non_dup
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[] |
24949467
|
10.1007/JHEP09(2013)016
|
A consistent set of asymptotic conditions for higher spin gravity in three
dimensions is proposed in the case of vanishing cosmological constant. The
asymptotic symmetries are found to be spanned by a higher spin extension of the
BMS3 algebra with an appropriate central extension. It is also shown that our
results can be recovered from the ones recently found for asymptotically AdS3
spacetimes by virtue of a suitable gauge choice that allows to perform the
vanishing cosmological constant limit.Comment: 12 pages, no figures. v2: References added and typos corrected. A new
appendix is also included. v3: Typos corrected. Matches published versio
|
Asymptotically flat spacetimes in three-dimensional higher spin gravity
|
asymptotically flat spacetimes in three-dimensional higher spin gravity
|
asymptotic vanishing cosmological constant. asymptotic symmetries spanned extension. recovered asymptotically spacetimes virtue vanishing cosmological pages figures. typos corrected. included. typos corrected. matches versio
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non_dup
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[] |
24936172
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10.1007/JHEP09(2013)020
|
If the hidden sector contains more than one U(1) groups, additional dim-4
couplings (beyond the kinetic mixing) between the massive U(1) fields and the
hypercharge generally appear. These are of the form similar to the Chern-Simons
interactions. We study the phenomenology of such couplings including
constraints from laboratory experiments and implications for dark matter. The
hidden vector fields can play the role of dark matter whose characteristic
signature would be monochromatic gamma ray emission from the galactic center.
We show that this possibility is consistent with the LHC and other laboratory
constraints, as well as astrophysical bounds.Comment: 23 pages, 10 figure
|
More on the Hypercharge Portal into the Dark Sector
|
more on the hypercharge portal into the dark sector
|
hidden couplings massive hypercharge appear. chern simons interactions. phenomenology couplings matter. hidden signature monochromatic gamma galactic center. astrophysical pages
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non_dup
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[] |
24937078
|
10.1007/JHEP09(2013)021
|
We consider a model of dynamical electroweak symmetry breaking built on the
idea of top-seesaw mechanism. The model features a fourth generation of
vector-like QCD quarks responsible for the origin of the top-seesaw mechanism
and leading to the natural explanation of the large splitting between the top
and bottom quark masses. Motivated by the LHC data on the couplings of the
Higgs boson, we include the entire third generation of Standard Model matter
fields into the model. We determine the low energy effective theory and the
resulting low energy spectrum of states, and constrain the model parameters
with constraints from the precision electroweak data and from the requirement
of a light scalar state with quantum numbers of the Standard Model Higgs boson.
Finally, we perform a global fit of the model parameters to the LHC Higgs data
and show that the model is equally viable as the Standard Model itself, and
predicts new states accessible at the LHC.Comment: 31 pages, 10 figures, references adde
|
126 GeV Higgs boson in the top-seesaw model
|
126 gev higgs boson in the top-seesaw model
|
electroweak breaking built seesaw mechanism. fourth quarks seesaw explanation splitting masses. motivated couplings boson model. constrain precision electroweak requirement boson. equally viable predicts accessible pages adde
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non_dup
|
[] |
24932809
|
10.1007/JHEP09(2013)022
|
We consider a model with a gauge singlet Dirac fermion as a cold dark matter
candidate. The dark matter particle communicates with the Standard Model via a
gauge singlet scalar mediator that couples to the Higgs. The scalar mediator
also serves to create a tree-level barrier in the scalar potential which leads
to a strongly first order electroweak phase transition as required for
Electroweak Baryogenesis. We find a large number of models that can account for
all the dark matter and provide a strong phase transition while avoiding
constraints from dark matter direct detection, electroweak precision data, and
the latest Higgs data from the LHC. The next generation of direct detection
experiments could rule out a large region of the parameter space but can be
evaded in some regions when the Higgs-singlet mixing is very small.Comment: 9 pages, 6 figures. v2: figure captions updated, colour confusion
fixed, no other changes. v3: references added, some clarification, now
matches version published in JHE
|
Singlet Fermionic Dark Matter and the Electroweak Phase Transition
|
singlet fermionic dark matter and the electroweak phase transition
|
singlet dirac fermion cold candidate. communicates singlet mediator couples higgs. mediator serves create barrier electroweak electroweak baryogenesis. avoiding electroweak precision latest lhc. evaded singlet pages figures. captions updated colour confusion changes. clarification matches
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non_dup
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[] |
24941341
|
10.1007/JHEP09(2013)024
|
We perform numerical fits of Grand Unified Models based on SO(10), using
various combinations of 10-, 120- and 126-dimensional Higgs representations.
Both the supersymmetric and non-supersymmetric versions are fitted, as well as
both possible neutrino mass orderings. In contrast to most previous works, we
perform the fits at the weak scale, i.e. we use RG evolution from the GUT
scale, at which the GUT-relations between the various Yukawa coupling matrices
hold, down to the weak scale. In addition, the right-handed neutrinos of the
seesaw mechanism are integrated out one by one in the RG running. Other new
features are the inclusion of recent results on the reactor neutrino mixing
angle and the Higgs mass (in the non-SUSY case). As expected from vacuum
stability considerations, the low Higgs mass and the large top-quark Yukawa
coupling cause some pressure on the fits. A lower top-quark mass, as sometimes
argued to be the result of a more consistent extraction from experimental
results, can relieve this pressure and improve the fits. We give predictions
for neutrino masses, including the effective one for neutrinoless double beta
decay, as well as the atmospheric neutrino mixing angle and the leptonic CP
phase for neutrino oscillations.Comment: 40 pages, 2 figures. Published versio
|
Fits to SO(10) Grand Unified Models
|
fits to so(10) grand unified models
|
fits grand unified combinations representations. supersymmetric supersymmetric versions fitted orderings. fits i.e. yukawa hold scale. handed neutrinos seesaw running. inclusion reactor susy considerations yukawa fits. sometimes argued extraction relieve fits. neutrinoless beta leptonic pages figures. versio
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non_dup
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[] |
24931771
|
10.1007/JHEP09(2013)025
|
A non-abelian magnetic field in Yang-Mills theory induces the formation of a
"W-boson" vortex lattice. We study the propagation of fundamental fermions in
the presence of this lattice in 2+1 dimensions. We show that the spectrum for
massless fermions contains four topologically-protected Dirac points with
non-zero Bloch momentum. For massive fermions, we compute topological
invariants of the band structure and show that it is possible to realise a Z2
topological insulator within Yang-Mills theory.Comment: 28 pages + appendices, 5 figures. v2: Added comments on stability of
lattice. Emphasised role of Higgs field. Added references v3: Further
reference added. v4: Version to appear in JHE
|
Gauge Dynamics and Topological Insulators
|
gauge dynamics and topological insulators
|
abelian mills induces boson vortex lattice. propagation fermions dimensions. massless fermions topologically protected dirac bloch momentum. massive fermions topological invariants realise topological insulator mills pages appendices figures. comments lattice. emphasised field. added.
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non_dup
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[] |
43547273
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10.1007/JHEP09(2013)026
|
The holographic isotropization of a highly anisotropic, homogeneous, strongly coupled, non-Abelian plasma was simplified in ref. [1] by linearizing Einstein"s equations around the final, equilibrium state. This approximation reproduces the expectation value of the boundary stress tensor with a 20% accuracy. Here we elaborate on these results and extend them to observables that are directly sensitive to the bulk interior, focusing for simplicity on the entropy production on the event horizon. We also consider next-to-leading-order corrections and show that the leading terms alone provide a better description of the isotropization process for the states that are furthest from equilibrium
|
Holographic isotropization linearized
|
holographic isotropization linearized
|
holographic isotropization anisotropic homogeneous abelian simplified ref. linearizing einstein state. reproduces expectation accuracy. elaborate extend observables interior focusing simplicity horizon. isotropization furthest
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non_dup
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[] |
24938157
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10.1007/JHEP09(2013)028
|
We study the presence of discrete flavor symmetries in D-brane models of
particle physics. By analyzing the compact extra dimensions of these models one
can determine when such symmetries exist both in the context of intersecting
and magnetized D-brane constructions. Our approach allows to distinguish
between approximate and exact discrete symmetries, and it can be applied to
compactification manifolds with continuous isometries or to manifolds that only
contain discrete isometries, like Calabi-Yau three-folds. We analyze in detail
the class of rigid D-branes models based on a Z_2 x Z'_2 toroidal orientifold,
for which the flavor symmetry group is either the dihedral group D_4 or tensor
products of it. We construct explicit Pati-Salam examples in which families
transform in non-Abelian representations of the flavor symmetry group,
constraining Yukawa couplings beyond the effect of massive U(1) D-brane
symmetries.Comment: 46 pages + appendices, 7 figures. v2: typos corrected and references
adde
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Discrete flavor symmetries in D-brane models
|
discrete flavor symmetries in d-brane models
|
flavor symmetries brane physics. analyzing extra symmetries intersecting magnetized brane constructions. distinguish approximate symmetries compactification manifolds isometries manifolds isometries calabi folds. analyze rigid branes toroidal orientifold flavor dihedral pati salam families transform abelian representations flavor constraining yukawa couplings massive brane pages appendices figures. typos corrected adde
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non_dup
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[] |
24943824
|
10.1007/JHEP09(2013)029
|
We present first analytic, resummed calculations of the rates at which
widespread jet substructure tools tag QCD jets. As well as considering
trimming, pruning and the mass-drop tagger, we introduce modified tools with
improved analytical and phenomenological behaviours. Most taggers have double
logarithmic resummed structures. The modified mass-drop tagger is special in
that it involves only single logarithms, and is free from a complex class of
terms known as non-global logarithms. The modification of pruning brings an
improved ability to discriminate between the different colour structures that
characterise signal and background. As we outline in an extensive
phenomenological discussion, these results provide valuable insight into the
performance of existing tools and help lay robust foundations for future
substructure studies.Comment: 52 pages, 18 figures. Version to be published in JHEP: added an
Appendix about Y-trimming and addressed several points raised by the refere
|
Towards an understanding of jet substructure
|
towards an understanding of jet substructure
|
analytic resummed widespread substructure jets. trimming pruning drop tagger phenomenological behaviours. taggers logarithmic resummed structures. drop tagger involves logarithms logarithms. modification pruning brings discriminate colour characterise background. outline extensive phenomenological valuable insight robust foundations substructure pages figures. jhep trimming addressed raised refere
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non_dup
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[] |
24941854
|
10.1007/JHEP09(2013)030
|
There is a `Mathieu moonshine' relating the elliptic genus of K3 to the
sporadic group M_{24}. Here, we give evidence that this moonshine extends to
part of the web of dualities connecting heterotic strings compactified on K3
\times T^2 to type IIA strings compactified on Calabi-Yau threefolds. We
demonstrate that dimensions of M_{24} representations govern the new
supersymmetric index of the heterotic compactifications, and appear in the
Gromov--Witten invariants of the dual Calabi-Yau threefolds, which are elliptic
fibrations over the Hirzebruch surfaces F_n.Comment: 28 pages; v2: minor changes, published versio
|
Mathieu Moonshine and N=2 String Compactifications
|
mathieu moonshine and n=2 string compactifications
|
mathieu moonshine relating elliptic genus sporadic moonshine extends dualities connecting heterotic strings compactified strings compactified calabi threefolds. representations govern supersymmetric heterotic compactifications gromov witten invariants calabi threefolds elliptic fibrations hirzebruch pages minor versio
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non_dup
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[] |
55625966
|
10.1007/JHEP09(2013)038
|
We study scattering of minimally coupled massless scalar fields by non-extremal
spherically symmetric black holes in d dimensions with string-theoretical α′ corrections. We
then obtain a formula for the low frequency absorption cross section for every black hole
of this kind, which we apply to known black hole solutions. We compare the α′ corrections
for the absorption cross section with those for the black hole entropy, obtained through
Wald’s formula, in each case concluding that these corrections are different. We find a general
covariant formula for the absorption cross section including α′ corrections, in terms of
the horizon area and temperatureThe author wishes to acknowledge useful discussions with Dan Gorbonos, Miguel Paulos, Sameer Murthy and Ricardo Schiappa. This work has been supported by FEDER funds through Programa Operacional Fatores de Competitividade - COMPETE and by Fundacao para a Ciencia e a Tecnologia through projects Est-C/MAT/UI0013/2011, CERN/FP/116377/2010 and CERN/FP/123609/2011
|
Scattering of spherically symmetric d-dimensional α′−corrected black holes in string theory
|
scattering of spherically symmetric d-dimensional α′−corrected black holes in string theory
|
minimally massless extremal spherically holes corrections. kind solutions. wald’s concluding different. covariant horizon temperaturethe wishes acknowledge discussions gorbonos miguel paulos sameer murthy ricardo schiappa. feder funds programa operacional fatores competitividade compete fundacao para ciencia tecnologia projects cern cern
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non_dup
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24948205
|
10.1007/JHEP09(2013)040
|
We analyze the moduli space of spontaneously broken N=8 supergravity theories
in 4 dimensions with classical Minkowski vacua. We find that all the known
classical vacua, as well as the several new ones we construct here, can be
connected by sending some of the moduli to their boundary values. We also show
that Cremmer-Scherk-Schwarz models can be viewed as special limits of more
general CSO* gaugings, which allow for non-Abelian residual symmetries on the
vacuum. Finally, we find that all the classical Minkowski vacua with fully
broken supersymmetry found so far are unstable with respect to 1-loop
corrections, which drive the effective potential to negative values.Comment: 37 pages; v2: one reference and two comments added, version accepted
for publication on JHEP; v3: small problem with boldface fonts fixe
|
On the moduli space of spontaneously broken N = 8 supergravity
|
on the moduli space of spontaneously broken n = 8 supergravity
|
analyze moduli spontaneously broken supergravity minkowski vacua. vacua sending moduli values. cremmer scherk schwarz viewed gaugings abelian residual symmetries vacuum. minkowski vacua broken supersymmetry unstable drive pages comments publication jhep boldface fonts fixe
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non_dup
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[] |
24769998
|
10.1007/JHEP09(2013)041
|
We describe a novel way to measure the mass of heavy, long-lived neutral
particles that decay to photons using collider experiments. We focus on a Light
Neutralino and Gravitino model in a Gauge Mediated Supersymmetry Breaking
scenario where the neutralino has a long-lifetime (O(ns)) as it is not excluded
by current experiments. To illustrate our method and give sensitivity estimates
we use recent CDF results and a production mechanism where sparticles are
produced via $\phi_{i} \rightarrow \widetilde{\chi}^{1}_{0}
\widetilde{\chi}^{1}_{0} \rightarrow (\gamma \widetilde{G})(\gamma
\widetilde{G})$ in which $\phi_{i}$ indicates a neutral scalar boson,
$\widetilde{\chi}^{1}_{0}$ is the lightest neutralino and $\widetilde{G}$ is
the gravitino, as a full set of background shapes and rates are available.
Events can be observed in the exclusive photon plus Missing $E_{T}$ final state
where one photon arrives at the detector with a delayed time of arrival.
Surprisingly, a simple measurement of the slope of the delayed-time
distribution with the full CDF dataset is largely insensitive to all but the
$\widetilde{\chi}^{1}_{0}$ mass and allows for the possibility of determining
its mass to approximately 25% of itself.Comment: 16 pages, 6 figure
|
Prospects for measuring the mass of heavy, long-lived neutral particles
that decay to photons
|
prospects for measuring the mass of heavy, long-lived neutral particles that decay to photons
|
lived neutral photons collider experiments. neutralino gravitino supersymmetry breaking neutralino lifetime excluded experiments. illustrate sparticles rightarrow widetilde widetilde rightarrow gamma widetilde gamma widetilde neutral boson widetilde lightest neutralino widetilde gravitino shapes available. exclusive missing arrives delayed arrival. surprisingly delayed dataset largely insensitive widetilde determining pages
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non_dup
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24940280
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10.1007/JHEP09(2013)042
|
In four-dimensional N=1 Minkowski superspace, general nonlinear sigma models
with four-dimensional target spaces may be realised in term of CCL (chiral and
complex linear) dynamical variables which consist of a chiral scalar, a complex
linear scalar and their conjugate superfields. Here we introduce CCL sigma
models that are invariant under U(1) "duality rotations" exchanging the
dynamical variables and their equations of motion. The Lagrangians of such
sigma models prove to obey a partial differential equation that is analogous to
the self-duality equation obeyed by U(1) duality invariant models for nonlinear
electrodynamics. These sigma models are self-dual under a Legendre
transformation that simultaneously dualises (i) the chiral multiplet into a
complex linear one; and (ii) the complex linear multiplet into a chiral one.
Any CCL sigma model possesses a dual formulation given in terms of two chiral
multiplets. The U(1) duality invariance of the CCL sigma model proves to be
equivalent, in the dual chiral formulation, to a manifest U(1) invariance
rotating the two chiral scalars. Since the target space has a holomorphic
Killing vector, the sigma model possesses a third formulation realised in terms
of a chiral multiplet and a tensor multiplet.
The family of U(1) duality invariant CCL sigma models includes a subset of
N=2 supersymmetric theories. Their target spaces are hyper Kahler manifolds
with a non-zero Killing vector field. In the case that the Killing vector field
is triholomorphic, the sigma model admits a dual formulation in terms of a
self-interacting off-shell N=2 tensor multiplet.
We also identify a subset of CCL sigma models which are in a one-to-one
correspondence with the U(1) duality invariant models for nonlinear
electrodynamics. The target space isometry group for these sigma models
contains a subgroup U(1) x U(1).Comment: 22 page
|
Self-dual supersymmetric nonlinear sigma models
|
self-dual supersymmetric nonlinear sigma models
|
minkowski superspace sigma realised chiral consist chiral conjugate superfields. sigma duality rotations exchanging motion. lagrangians sigma obey analogous duality obeyed duality electrodynamics. sigma legendre simultaneously dualises chiral multiplet multiplet chiral one. sigma possesses formulation chiral multiplets. duality invariance sigma proves chiral formulation manifest invariance rotating chiral scalars. holomorphic killing sigma possesses formulation realised chiral multiplet multiplet. duality sigma supersymmetric theories. hyper kahler manifolds killing field. killing triholomorphic sigma admits formulation interacting multiplet. sigma correspondence duality electrodynamics. isometry sigma subgroup .comment
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non_dup
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[] |
24795551
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10.1007/JHEP09(2013)043
|
In light of recent remarkable progress in Higgs search at the LHC, we study
the rare decay process $h \to Z\gamma$ and show its correlation with the decay
$h \to \gamma\gamma$ in low energy SUSY models such as CMSSM, MSSM, NMSSM and
nMSSM. Under various experimental constraints, we scan the parameter space of
each model, and present in the allowed parameter space the SUSY predictions on
the $Z\gamma$ and $\gamma\gamma$ signal rates in the Higgs production at the
LHC and future e+e- linear colliders. We have following observations: (i)
Compared with the SM prediction, the $Z\gamma$ and $\gamma\gamma$ signal rates
in the CMSSM are both slightly suppressed; (ii) In the MSSM, both the $Z\gamma$
and $\gamma\gamma$ rates can be either enhanced or suppressed, and in optimal
case, the enhancement factors can reach 1.2 and 2 respectively; (iii) In the
NMSSM, the $Z\gamma$ and $\gamma\gamma$ signal rates normalized by their SM
predictions are strongly correlated, and vary from 0.2 to 2; (iv) In the nMSSM,
the $Z\gamma$ and $\gamma\gamma$ rates are greatly reduced. Since the
correlation behavior between the Z\gamma signal and the \gamma\gamma signal is
so model-dependent, it may be used to distinguish the models in future
experiments.Comment: 28 pages, 6 figure
|
The Z+photon and diphoton decays of the Higgs boson as a joint probe of
low energy SUSY models at LHC
|
the z+photon and diphoton decays of the higgs boson as a joint probe of low energy susy models at lhc
|
remarkable progress rare gamma gamma gamma susy cmssm mssm nmssm nmssm. scan susy gamma gamma gamma colliders. gamma gamma gamma cmssm suppressed mssm gamma gamma gamma suppressed enhancement nmssm gamma gamma gamma vary nmssm gamma gamma gamma greatly reduced. gamma gamma gamma distinguish pages
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non_dup
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[] |
24797881
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10.1007/JHEP09(2013)044
|
We consider the gauge theory of Lorentz group coupled in a nonminimal way to
fermions. We suggest the hypothesis that the given theory may exist in the
phase with broken chiral symmetry and without confinement. The lattice
discretization of the model is described. This unusual strongly coupled theory
may appear to be the source of the dynamical electroweak symmetry breaking.
Namely, in this theory all existing fermions interact with the SO(3,1) gauge
field. In the absence of the other interactions the chiral condensate may
appear and all fermionic excitations may acquire equal masses. Small
corrections to the gap equations due to the other interactions may cause the
appearance of the observed hierarchy of masses.Comment: accepted for publication in JHE
|
Gauge theory of Lorentz group as a source of the dynamical electroweak
symmetry breaking
|
gauge theory of lorentz group as a source of the dynamical electroweak symmetry breaking
|
lorentz nonminimal fermions. broken chiral confinement. discretization described. unusual electroweak breaking. fermions interact field. chiral condensate fermionic excitations acquire masses. appearance hierarchy publication
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non_dup
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[] |
24936296
|
10.1007/JHEP09(2013)045
|
The cosmological constant problem and the absence of new natural physics at
the electroweak scale, if confirmed by the LHC, may either indicate that the
nature is fine-tuned or that a refined notion of naturalness is required. We
construct a family of toy UV complete quantum theories providing a proof of
concept for the second possibility. Low energy physics is described by a tuned
effective field theory, which exhibits relevant interactions not protected by
any symmetries and separated by an arbitrary large mass gap from the new
"gravitational" physics, represented by a set of irrelevant operators.
Nevertheless, the only available language to describe dynamics at all energy
scales does not require any fine-tuning. The interesting novel feature of this
construction is that UV physics is not described by a fixed point, but rather
exhibits asymptotic fragility. Observation of additional unprotected scalars at
the LHC would be a smoking gun for this scenario. Natural tuning also favors
TeV scale unification.Comment: 25 pages, 6 figure
|
Natural Tuning: Towards A Proof of Concept
|
natural tuning: towards a proof of concept
|
cosmological electroweak confirmed fine tuned refined notion naturalness required. possibility. tuned exhibits protected symmetries separated gravitational irrelevant operators. nevertheless fine tuning. exhibits asymptotic fragility. unprotected scalars smoking scenario. tuning favors pages
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non_dup
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[] |
24931357
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10.1007/JHEP09(2013)048
|
We investigate holographic superconductors in asympototically geometries with
hyperscaling violation. The mass of the scalar field decouples from the UV
dimension of the dual scalar operator and can be chosen as negative as we want,
without disturbing the Breitenlohner-Freedman bound. We first numerically find
that the scalar condenses below a critical temperature and a gap opens in the
real part of the conductivity, indicating the onset of superconductivity. We
further analytically explore the effects of the hyperscaling violation on the
superconducting transition temperature. We find that the critical temperature
increases with the increasing of hyperscaling violation.Comment: 12pages and 3 figure
|
Holographic superconductors with hyperscaling violation
|
holographic superconductors with hyperscaling violation
|
holographic superconductors asympototically geometries hyperscaling violation. decouples want disturbing breitenlohner freedman bound. numerically condenses opens conductivity onset superconductivity. analytically explore hyperscaling violation superconducting temperature. hyperscaling pages
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non_dup
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[] |
24938949
|
10.1007/JHEP09(2013)050
|
We present and develop several nonlinear energy conditions suitable for use
in the semiclassical regime. In particular, we consider the recently formulated
"flux energy condition" (FEC), and the novel "trace-of-square" (TOSEC) and
"determinant" (DETEC) energy conditions. As we shall show, these nonlinear
energy conditions behave much better than the classical linear energy
conditions in the presence of semiclassical quantum effects. Moreover, whereas
the quantum extensions of these nonlinear energy conditions seem to be quite
widely satisfied as one enters the quantum realm, analogous quantum extensions
are generally not useful for the linear classical energy conditions.Comment: V1: 42 pages, 6 figures. V2: 43 pages, 6 figures. Title changed, some
discussion added, 3 references added, some typos fixed. V3: Minor edits.
Published versio
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Semiclassical energy conditions for quantum vacuum states
|
semiclassical energy conditions for quantum vacuum states
|
semiclassical regime. formulated trace tosec determinant detec conditions. behave semiclassical effects. extensions seem widely satisfied enters realm analogous extensions pages figures. pages figures. title changed typos fixed. minor edits. versio
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non_dup
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[] |
24971337
|
10.1007/JHEP09(2013)056
|
The phenomenon of wave tails has attracted much attention over the years from
both physicists and mathematicians. However, our understanding of this
fascinating phenomenon is not complete yet. In particular, most former studies
of the tail phenomenon have focused on scattering potentials which approach
zero asymptotically ($x\to\infty$) faster than $x^{-2}$. It is well-known that
for these (rapidly decaying) scattering potentials the late-time tails are
determined by the first Born approximation and are therefore {\it linear} in
the amplitudes of the scattering potentials (there are, however, some
exceptional cases in which the first Born approximation vanishes and one has to
consider higher orders of the scattering problem). In the present study we
analyze in detail the late-time dynamics of the Klein-Gordon wave equation with
a ({\it slowly} decaying) Coulomb-like scattering potential:
$V(x\to\infty)=\alpha/x$. In particular, we write down an explicit solution
(that is, an exact analytic solution which is not based on the first Born
approximation) for this scattering problem. It is found that the asymptotic
($t\to\infty$) late-time behavior of the fields depends {\it non}-linearly on
the amplitude $\alpha$ of the scattering potential. This non-linear dependence
on the amplitude of the scattering potential reflects the fact that the
late-time dynamics associated with this slowly decaying scattering potential is
dominated by {\it multiple} scattering from asymptotically far regions.Comment: 5 page
|
Scattering by a long-range potential
|
scattering by a long-range potential
|
phenomenon tails attracted physicists mathematicians. fascinating phenomenon yet. former tail phenomenon focused potentials asymptotically infty faster rapidly decaying potentials tails born amplitudes potentials exceptional born vanishes orders analyze klein gordon slowly decaying coulomb infty alpha analytic born problem. asymptotic infty linearly alpha potential. reflects slowly decaying dominated asymptotically
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non_dup
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[] |
24937083
|
10.1007/JHEP09(2013)057
|
We study the holographic entanglement entropy in a homogeneous falling shell
background, which is dual to the strongly coupled field theory following a
global quench. For d=2 conformal field theories, it is known that the entropy
has a linear growth regime if the scale of the entangling region is large. In
addition, the growth rate approaches a constant when the scale increases. We
demonstrate analytically that this behavior is directly related to the part of
minimal area surface probing the interior of apparent horizons in the bulk, as
well as the mutual information between two disjoint rectangular subsystems in
the boundary. Furthermore, we show numerically that all the results are
universal for the d=3 conformal field theory, the non-relativistic
scale-invariant theory and the dual theory of Gauss-Bonnet gravity.Comment: 35 pages, 19 figures, minor changes, version matching that published
on JHE
|
Linear growth of entanglement entropy in holographic thermalization
captured by horizon interiors and mutual information
|
linear growth of entanglement entropy in holographic thermalization captured by horizon interiors and mutual information
|
holographic entanglement homogeneous falling quench. conformal entangling large. increases. analytically probing interior apparent horizons mutual disjoint rectangular subsystems boundary. numerically universal conformal relativistic gauss bonnet pages minor matching
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non_dup
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[] |
24938398
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10.1007/JHEP09(2013)060
|
We study the lepton sector of composite Higgs models with partial
compositeness. The standard anarchic scenario is in conflict with the absence
of observable charged lepton flavor violation. This tension can be completely
solved in MFV scenarios that require either left-handed or right-handed SM
leptons to be equally composite. Constraints on this scenario are weak and the
composite lepton partners could be as light as few hundreds GeVs with
interesting LHC signatures. The contribution to the muon (g-2) in theories
where the Higgs is a pseudo Nambu-Goldstone boson is also discussed.Comment: 16 pages; v2 Refs. added, version published on JHEP; v3 appendix on
muon g-2 superseded by 1407.247
|
Leptons in Composite MFV
|
leptons in composite mfv
|
lepton composite compositeness. anarchic conflict observable lepton flavor violation. tension solved scenarios handed handed leptons equally composite. composite lepton partners hundreds gevs signatures. muon pseudo nambu goldstone boson pages refs. jhep muon superseded
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non_dup
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[] |
24932271
|
10.1007/JHEP09(2013)061
|
The Higgs boson mass and the abundance of dark matter constrain the
CMSSM/mSUGRA supersymmetry breaking inputs. A complete map of the CMSSM that is
consistent with these two measured quantities is provided. Various
"continents," consisting of non-excluded models, can be organized by their dark
matter dynamics. The following mechanisms manifest: well-tempering, resonant
pseudo-scalar Higgs annihilation, neutralino/stau coannihilations and
neutralino/stop coannihilations. Benchmark models are chosen in order to
characterize the viable regions. The expected visible signals of each are
described, demonstrating a wide range of predictions for the 13 TeV LHC and a
high degree of complementarity between dark matter and collider experiments.
The parameter space spans a finite volume, which can be probed in its entirety
with experiments currently under consideration.Comment: 58 pages + references, 21 figures, data files included on arXiv; v2:
references added, minor changes; v3: journal version, minor change
|
Here be Dragons: The Unexplored Continents of the CMSSM
|
here be dragons: the unexplored continents of the cmssm
|
boson abundance constrain cmssm msugra supersymmetry breaking inputs. cmssm quantities provided. continents consisting excluded organized dynamics. manifest tempering resonant pseudo annihilation neutralino stau coannihilations neutralino stop coannihilations. benchmark characterize viable regions. visible demonstrating complementarity collider experiments. spans probed entirety pages files minor minor
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non_dup
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[] |
24940093
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10.1007/JHEP09(2013)069
|
As part of the study of the two-body problem in Einstein's gravity, the
fourth post-Newtonian order (4PN) of the two-body effective action is being
computed presently by both effective field theory (EFT) methods and others.
Diagrams with 3 (or 4) classical loops appear to be a significant obstacle. In
this paper we develop a method to compute such 3-loop diagrams and demonstrate
it through a specific diagram. We reduce the classical diagrams through
shrinking the body worldlines to a form more familiar in Quantum Field Theory.
A key ingredient in the evaluation is the Integration By Parts method for
Feynman integrals.Comment: 15 pages, 6 figures. v2: updated references and credit. v3: added
calculation and a minor correctio
|
Classical 3-loop 2-body diagrams
|
classical 3-loop 2-body diagrams
|
einstein fourth newtonian presently others. diagrams loops obstacle. diagrams diagram. diagrams shrinking worldlines familiar theory. ingredient feynman pages figures. updated credit. minor correctio
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non_dup
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[] |
24946394
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10.1007/JHEP09(2013)070
|
We study a large class of BPS surface defects in 4d N=2 gauge theories. They
are defined by coupling a 2d N=(2,2) gauged linear sigma model to the 4d bulk
degrees of freedom. Our main result is an efficient computation of the
effective twisted superpotential for all these models in terms of a basic
object closely related to the resolvent of the 4d gauge theory, which encodes
the curve describing the 4d low energy dynamics. We reproduce and extend the
results of brane constructions and compute the effective twisted superpotential
for general monodromy surface defects. We encounter novel, puzzling field
theory phenomena in the low energy dynamics of the simplest surface defects and
we propose some local models to explain them. We also study in some detail the
behavior of surface defects near monopole points of the bulk theory's Coulomb
branch. Finally, we explore the effect on the defect of breaking the bulk
supersymmetry from N=2 to N=1 and show that certain quantities are independent
of this breaking.Comment: 59 pages, 8 figures, references adde
|
Surface Defects and Resolvents
|
surface defects and resolvents
|
defects theories. gauged sigma freedom. twisted superpotential closely resolvent encodes describing dynamics. reproduce extend brane constructions twisted superpotential monodromy defects. encounter puzzling phenomena simplest defects propose them. defects monopole coulomb branch. explore defect breaking supersymmetry quantities pages adde
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non_dup
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[] |
24932489
|
10.1007/JHEP09(2013)072
|
We propose a new off-shell formulation for N-extended conformal supergravity
in three spacetime dimensions. Our construction is based on the gauging of the
N-extended superconformal algebra in superspace. Covariant constraints are
imposed such that the algebra of covariant derivatives is given in terms of a
single curvature superfield which turns out to be the super Cotton tensor. An
immediate corollary of this construction is that the curved superspace is
conformally flat if and only if the super Cotton tensor vanishes. Upon
degauging of certain local symmetries, our formulation is shown to reduce to
the conventional one with the local structure group SL(2,R) x SO(N).Comment: 46 pages; v3: published versio
|
Conformal supergravity in three dimensions: New off-shell formulation
|
conformal supergravity in three dimensions: new off-shell formulation
|
propose formulation conformal supergravity spacetime dimensions. gauging superconformal superspace. covariant imposed covariant derivatives curvature superfield turns super cotton tensor. immediate corollary curved superspace conformally super cotton vanishes. degauging symmetries formulation .comment pages versio
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non_dup
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[] |
33070160
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10.1007/JHEP09(2013)073
|
Hydrodynamics can be consistently formulated on surfaces of arbitrary co-dimension in a background space-time, providing the effective theory describing long-wavelength perturbations of black branes. When the co-dimension is non-zero, the system acquires fluid-elastic properties and constitutes what is called a fluid brane. Applying an effective action approach, the most general form of the free energy quadratic in the extrinsic curvature and extrinsic twist potential of stationary fluid brane configurations is constructed to second order in a derivative expansion. This construction generalizes the Helfrich-Canham bending energy for fluid membranes studied in theoretical biology to the case in which the fluid is rotating. It is found that stationary fluid brane configurations are characterized by a set of 3 elastic response coefficients, 3 hydrodynamic response coefficients and 1 spin response coefficient for co-dimension greater than one. Moreover, the elastic degrees of freedom present in the system are coupled to the hydrodynamic degrees of freedom. For co-dimension-1 surfaces we find a 8 independent parameter family of stationary fluid branes. It is further shown that elastic and spin corrections to (non)-extremal brane effective actions can be accounted for by a multipole expansion of the stress-energy tensor, therefore establishing a relation between the different formalisms of Carter, Capovilla-Guven and Vasilic-Vojinovic and between gravity and the effective description of stationary fluid branes. Finally, it is shown that the Young modulus found in the literature for black branes falls into the class predicted by this approach - a relation which is then used to make a proposal for the second order effective action of stationary blackfolds and to find the corrected horizon angular velocity of thin black rings
|
How fluids bend: the elastic expansion for higher-dimensional black holes
|
how fluids bend: the elastic expansion for higher-dimensional black holes
|
hydrodynamics consistently formulated describing perturbations branes. acquires elastic constitutes brane. quadratic extrinsic curvature extrinsic twist stationary brane configurations expansion. generalizes helfrich canham bending membranes rotating. stationary brane configurations elastic hydrodynamic one. elastic freedom hydrodynamic freedom. stationary branes. elastic extremal brane accounted multipole establishing formalisms carter capovilla guven vasilic vojinovic stationary branes. modulus branes falls proposal stationary blackfolds corrected horizon rings
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non_dup
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[] |
24946584
|
10.1007/JHEP09(2013)074
|
We construct a holographic multi-band superconductor model with each complex
scalar field in the bulk minimally coupled to a same gauge field. Taking into
account the back reaction of matter fields on the background geometry and
focusing on the two band case with two scalar order parameters, we find that
depending on the strength of the back reaction and the charge ratio of the two
bulk scalars, five different superconducting phases exist, and three of five
phases exhibit some region where both orders coexist and are thermodynamically
favored. The other two superconducting phases have only one scalar order. The
model exhibits rich phase structure and we construct the full diagram for the
five superconducting phases. Our analysis indicates that the equivalent
attractive interaction mediated by gravity between the two order parameters
tends to make the coexistence of two orders much more easy rather than more
difficult.Comment: v2: references adde
|
Competition and Coexistence of Order Parameters in Holographic
Multi-Band Superconductors
|
competition and coexistence of order parameters in holographic multi-band superconductors
|
holographic superconductor minimally field. focusing scalars superconducting exhibit orders coexist thermodynamically favored. superconducting order. exhibits superconducting phases. attractive tends coexistence orders adde
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non_dup
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[] |
24944326
|
10.1007/JHEP09(2013)080
|
We extend the techniques of double field theory to more general gravity
theories and U-duality symmetries, having in mind applications to the complete
D=11 supergravity. In this paper we work out a (3+3)-dimensional `U-duality
covariantization' of D=4 Einstein gravity, in which the Ehlers group SL(2,R) is
realized geometrically, acting in the 3 representation on half of the
coordinates. We include the full (2+1)-dimensional metric, while the `internal
vielbein' is a coset representative of SL(2,R)/SO(2) and transforms under gauge
transformations via generalized Lie derivatives. In addition, we introduce a
gauge connection of the `C-bracket', and a gauge connection of SL(2,R), albeit
subject to constraints. The action takes the form of (2+1)-dimensional gravity
coupled to a Chern-Simons-matter theory but encodes the complete D=4 Einstein
gravity. We comment on generalizations, such as an `$E_{8(8)}$
covariantization' of M-theory.Comment: 36 pages, v2: refs. added, to appear in JHE
|
U-duality covariant gravity
|
u-duality covariant gravity
|
extend duality symmetries mind supergravity. duality covariantization einstein ehlers realized geometrically acting coordinates. vielbein coset transforms transformations derivatives. connection bracket connection albeit constraints. chern simons encodes einstein gravity. comment generalizations covariantization pages refs.
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non_dup
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[] |
24935988
|
10.1007/JHEP09(2013)081
|
We study the field theory limit of multi-loop (super)string amplitudes, with
the aim of clarifying their relationship to Feynman diagrams describing the
dynamics of the massless states. We propose an explicit map between string
moduli around degeneration points and Schwinger proper-times characterizing
individual Feynman diagram topologies. This makes it possible to identify the
contribution of each light string state within the full string amplitude and to
extract the field theory Feynman rules selected by (covariantly quantized)
string theory. The connection between string and field theory amplitudes also
provides a concrete tool to clarify ambiguities related to total derivatives
over moduli space: in the superstring case, consistency with the field theory
results selects a specific prescription for integrating over supermoduli. In
this paper, as an example, we focus on open strings supported by parallel
D-branes, and we present two-loop examples drawn from bosonic and RNS string
theories, highlighting the common features between the two setups.Comment: 23 pages, one figure; Changes in v3: Notation for \sqrt{k} changed in
equations (2.6), (3.11), (3.13), (5.10) with explanation added after (3.11)
and (5.9). Equation (5.13) and (5.14) altered (overall results unchanged).
Sign convention for \sqrt{p_i} added on p.13. Discussion slightly modified
after (3.12), (5.3), (5.15
|
Multi-loop open string amplitudes and their field theory limit
|
multi-loop open string amplitudes and their field theory limit
|
super amplitudes clarifying feynman diagrams describing massless states. propose moduli degeneration schwinger proper characterizing feynman topologies. extract feynman covariantly quantized theory. connection amplitudes concrete clarify ambiguities derivatives moduli superstring consistency selects prescription integrating supermoduli. strings branes drawn bosonic highlighting pages notation sqrt changed explanation altered unchanged convention sqrt
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non_dup
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24943826
|
10.1007/JHEP09(2013)084
|
We use gauge/gravity duality to study vector meson (J/{\Psi}, {\rho}_0,
{\Omega}, {\Phi}) production in electron-proton scattering, in the limit of
high center of mass energy at fixed momentum transfer, corresponding to the
limit of low Bjorken x, where the process is dominated by pomeron exchange. Our
approach considers the pomeron at strong coupling, described by the graviton
Regge trajectory in AdS space with a hard-wall to mimic confinement effects.
Both the proton and vector mesons are described by simple holographic wave
functions in AdS. This model agrees with HERA H1 data with a {\chi}^2 per
degree of freedom below one on total cross-sections, and below two on
differential cross-sections, confirming the success of previous studies that
model low x DIS and DVCS using gauge/gravity duality.Comment: 20 pages, 6 figures; reference adde
|
Vector meson production at low x from gauge/gravity duality
|
vector meson production at low x from gauge/gravity duality
|
duality meson omega proton bjorken dominated pomeron exchange. considers pomeron graviton regge trajectory mimic confinement effects. proton mesons holographic ads. agrees hera freedom confirming success dvcs pages adde
|
non_dup
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[] |
6208066
|
10.1007/JHEP09(2013)085
|
We explore the implications of a 126 GeV Higgs boson indicated by the recent
LHC results for two-Higgs doublet model (2HDM). Identifying the 126 GeV Higgs
boson as either the lighter or heavier of CP even neutral Higgs bosons in 2HDM,
we examine how the masses of Higgs fields and mixing parameters can be
constrained by the theoretical conditions and experimental constraints. The
theoretical conditions taken into account are the vacuum stability,
perturbativity and unitarity required to be satisfied up to a cut-off scale. We
also show how bounds on the masses of Higgs bosons and mixing parameters depend
on the cut-off scale. In addition, we investigate whether the allowed regions
of parameter space can accommodate particularly the enhanced di-photon signals,
ZZ* and WW* decay modes of the Higgs boson, and examine the prediction of the
signal strength of Z{\gamma} decay mode for the allowed regions of the
parameter space.Comment: To be published in JHEP, 20 pages, 11 figures, Figures and results
are updated for the recent LHC result
|
Constraining parameter space in type-II two-Higgs doublet model in light
of a 126 GeV Higgs boson
|
constraining parameter space in type-ii two-higgs doublet model in light of a 126 gev higgs boson
|
explore boson doublet identifying boson lighter heavier neutral bosons examine constrained constraints. perturbativity unitarity satisfied scale. bounds bosons scale. accommodate boson examine gamma jhep pages updated
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non_dup
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[] |
24932287
|
10.1007/JHEP09(2013)087
|
Chromo-Natural Inflation is the first worked example of a model of inflation
in which slow-roll inflation is achieved by "magnetic drift" as opposed to
Hubble friction. In this work, we give an account of the perturbations at
linear order in this model. Our analysis uncovers two novel phenomena. First,
the amplitude of scalar curvature perturbations is not directly tied to the
shape of the inflationary potential. This allows the theory to violate na\"ive
formulations of the Lyth bound. Second, the tensor sector of the theory is
significantly altered from the usual case: the non-Abelian gauge field
perturbations have a tensor degree of freedom. One chirality of the this tensor
can be exponentially enhanced by a temporary instability near horizon crossing;
this chiral instability exists because of the classical gauge field background,
which violates parity. These tensor fluctuations of the gauge field also couple
to gravitational waves at linear order in perturbation theory and source a
chiral spectrum of gravitational waves. This spectrum can be exponentially
enhanced over the usual inflationary spectrum due to the instability in the
gauge sector. These new features cause the theory in its present form to be in
significant tension with current observational data. This is because the new
scalar physics leads to a significant reddening of the spectral tilt in the
same region of parameter space where the exponential enhancement of the
gravitational wave amplitude is small enough to satisfy current constraints on
the tensor-to-scalar index. Hence, the model either predicts a spectral tilt
that is too red, or it overproduces gravitational waves, or both.Comment: References and minor comments added, plus expanded discussion of the
relation to Gauge-flation; version accepted for publication in JHE
|
Perturbations in Chromo-Natural Inflation
|
perturbations in chromo-natural inflation
|
chromo inflation worked inflation slow roll inflation drift opposed hubble friction. perturbations model. uncovers phenomena. curvature perturbations tied inflationary potential. violate formulations lyth bound. altered usual abelian perturbations freedom. chirality exponentially temporary instability horizon crossing chiral instability violates parity. couple gravitational perturbation chiral gravitational waves. exponentially usual inflationary instability sector. tension observational data. reddening tilt exponential enhancement gravitational satisfy index. predicts tilt overproduces gravitational minor comments expanded flation publication
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non_dup
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[] |
24949097
|
10.1007/JHEP09(2013)088
|
In this paper we identify and analyze in detail the subleading contributions
in the 1/N expansion of random tensors, in the simple case of a quartically
interacting model. The leading order for this 1/N expansion is made of graphs,
called melons, which are dual to particular triangulations of the D-dimensional
sphere, closely related to the "stacked" triangulations. For D<6 the subleading
behavior is governed by a larger family of graphs, hereafter called cherry
trees, which are also dual to the D-dimensional sphere. They can be resummed
explicitly through a double scaling limit. In sharp contrast with random matrix
models, this double scaling limit is stable. Apart from its unexpected upper
critical dimension 6, it displays a singularity at fixed distance from the
origin and is clearly the first step in a richer set of yet to be discovered
multi-scaling limits
|
Double Scaling in Tensor Models with a Quartic Interaction
|
double scaling in tensor models with a quartic interaction
|
analyze subleading tensors quartically interacting model. melons triangulations sphere closely stacked triangulations. subleading governed hereafter cherry trees sphere. resummed explicitly limit. sharp stable. apart unexpected displays singularity richer discovered
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non_dup
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[] |
24940861
|
10.1007/JHEP09(2013)089
|
The relatively large measured value of theta_13 has opened various
possiblities to determine the neutrino mass ordering, among them using PINGU,
the low-energy extention of the IceCube neutrino telescope, to observe matter
effects in atmospheric neutrinos, or a high statistics measurment of the
neutrino energy spectrum at a reactor neutrino experiment with a baseline of
around 60 km, such as the Daya Bay II project. In this work we point out a
synergy between these two approaches based on the fact that when data are
analysed with the wrong neutrino mass ordering the best fit occurs at different
values of |Delta m^2_31| for PINGU and Daya Bay II. Hence, the wrong mass
ordering can be excluded by a mismatch of the values inferred for |Delta
m^2_31|, thanks to the excellent accuracy for Delta m^2_31 of both experiments.
We perform numerical studies of PINGU and Daya Bay II sensitivities and show
that the synergy effect may lead to a high significance determination of the
mass ordering even in situations where the individual experiments obtain only
poor sensitivity.Comment: 23 pages, 7 figures (15 eps files), typos and minor mistakes
corrected, final version to appear in JHE
|
Determination of the neutrino mass ordering by combining PINGU and Daya
Bay II
|
determination of the neutrino mass ordering by combining pingu and daya bay ii
|
theta opened possiblities ordering pingu extention icecube telescope neutrinos measurment reactor daya project. synergy analysed wrong ordering delta pingu daya wrong ordering excluded mismatch inferred delta thanks excellent delta experiments. pingu daya sensitivities synergy ordering situations pages files typos minor mistakes corrected
|
non_dup
|
[] |
24793114
|
10.1007/JHEP09(2013)091
|
The discovery of a standard model (SM)-like Higgs boson with a relatively
heavy mass $m_h$ and hints of di-photon excess has deep implication to
supersymmetric standard models (SSMs). We consider the SSM extended with
hypercharge $\pm1$ triplets, and investigate two scenarios of it: (A) Triplets
significantly couple to the Higgs doublets, which can substantially raise $m_h$
and simultaneously enhance the Higgs to di-photon rate via light chargino
loops; (B) Oppositely, these couplings are quite weak and thus $m_h$ can not be
raised. But the doubly-charged Higgs bosons, owing to the gauge group
structure, naturally interprets why there is an excess rather than a deficient
of Higgs to di-photon rate. Additionally, the pseudo Dirac triplet fermion is
an inelastic non-thermal dark matter candidate. Light doubly-charged particles,
especially the doubly-charged Higgs boson around 100 GeV in scenario B, are
predicted. We give a preliminary discussion on their search at the LHC.Comment: JHEP version. Typos fixed, comments, references and acknowledge adde
|
Highlights of Supersymmetric Hypercharge $\pm1$ Triplets
|
highlights of supersymmetric hypercharge $\pm1$ triplets
|
discovery boson hints excess implication supersymmetric ssms hypercharge triplets scenarios triplets couple doublets substantially raise simultaneously enhance chargino loops oppositely couplings raised. doubly bosons owing naturally interprets excess deficient rate. additionally pseudo dirac triplet fermion inelastic candidate. doubly doubly boson predicted. preliminary jhep version. typos comments acknowledge adde
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non_dup
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[] |
24935824
|
10.1007/JHEP09(2013)092
|
We present a class of models with radiative neutrino mass and stable
dark-matter candidates. Neutrino mass is generated by a one-loop diagram with
the same topography as Ma's 2006 proposal (which used an inert scalar-doublet
and singlet fermion). We generalize this approach and determine all variants
with new fields no larger than the adjoint representation. When the neutrino
mass diagram contains a Majorana mass insertion there are two possibilities,
both of which are known. If the mass insertion is of the Dirac type there are
seven additional models, two of which are excluded by direct-detection
experiments. The other five models are also constrained, such that only scalar
dark-matter is viable. There are cases with an inert singlet, an inert doublet,
and an inert triplet, providing a natural setting for inert N-tuplet models of
dark matter, with the additional feature of achieving radiative neutrino mass.
We show that some of the models admit a simple explanation for the (requisite)
discrete symmetry, and briefly discuss cases with representations larger than
the adjoint, which can admit a connection to the astrophysical gamma-ray
signal.Comment: 1+22 pages; v2 journal versio
|
A Class of Inert N-tuplet Models with Radiative Neutrino Mass and Dark
Matter
|
a class of inert n-tuplet models with radiative neutrino mass and dark matter
|
radiative candidates. topography proposal inert doublet singlet fermion generalize variants adjoint representation. majorana insertion possibilities known. insertion dirac seven excluded experiments. constrained viable. inert singlet inert doublet inert triplet inert tuplet achieving radiative mass. admit explanation requisite briefly representations adjoint admit connection astrophysical gamma pages versio
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non_dup
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[] |
24931031
|
10.1007/JHEP09(2013)095
|
We are developing the algebraic construction for form factors of local
operators in the sinh-Gordon theory proposed in [B.Feigin, M.Lashkeivch, 2008].
We show that the operators corresponding to the null vectors in this
construction are given by the degenerate Macdonald polynomials with rectangular
partitions and the parameters $t=-q$ on the unit circle. We obtain an integral
representation for the null vectors and discuss its simple applications.Comment: 13 pages; v2: eq. (4.1) corrected; v3: minor corrections, references
added; v4: eq. (2.6) and the last equation of sect. 5 corrected; references
updated; more minor corrections; v5: eq. (4.1) corrected agai
|
On form factors and Macdonald polynomials
|
on form factors and macdonald polynomials
|
algebraic sinh gordon b.feigin m.lashkeivch degenerate macdonald polynomials rectangular partitions circle. pages corrected minor sect. corrected updated minor corrected agai
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non_dup
|
[] |
24941985
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10.1007/JHEP09(2013)096
|
We discuss non-Abelian discrete R symmetries which might have some
conceivable relevance for model building. The focus is on settings with N=1
supersymmetry, where the superspace coordinate transforms in a one-dimensional
representation of the non-Abelian discrete symmetry group. We derive anomaly
constraints for such symmetries and find that novel patterns of Green-Schwarz
anomaly cancellation emerge. In addition we show that perfect groups, also in
the non-R case, are always anomaly-free. An important property of models with
non-Abelian discrete R symmetries is that superpartners come in different
representations of the group. We present an example model, based on a
semidirect product of a Z_3 and a Z_8^R symmetry, to discuss generic features
of models which unify discrete R symmetries, entailing solutions to the mu and
proton decay problems of the MSSM, with non-Abelian discrete flavor symmetries.Comment: 21 page
|
Non-Abelian discrete R symmetries
|
non-abelian discrete r symmetries
|
abelian symmetries conceivable relevance building. settings supersymmetry superspace coordinate transforms abelian group. derive anomaly symmetries schwarz anomaly cancellation emerge. perfect anomaly free. abelian symmetries superpartners come representations group. semidirect generic unify symmetries entailing proton mssm abelian flavor
|
non_dup
|
[] |
24949672
|
10.1007/JHEP09(2013)097
|
We propose a new Skyrme-like model with fields taking values on the sphere
S^3 or, equivalently, on the group SU(2). The action of the model contains a
quadratic kinetic term plus a quartic term which is the same as that of the
Skyrme-Faddeev model. The novelty of the model is that it possess a first order
Bogomolny type equation whose solutions automatically satisfy the second order
Euler-Lagrange equations. It also possesses a lower bound on the static energy
which is saturated by the Bogomolny solutions. Such Bogomolny equation is
equivalent to the so-called force free equation used in plasma and solar
Physics, and which possesses large classes of solutions. An old result due to
Chandrasekhar prevents the existence of finite energy solutions for the force
free equation on the entire tridimensional space R^3. We construct new exact
finite energy solutions to the Bogomolny equations for the case where the space
is the three-sphere S^3, using toroidal like coordinates.Comment: 12 pages, no figure
|
A Skyrme-like model with an exact BPS bound
|
a skyrme-like model with an exact bps bound
|
propose skyrme sphere equivalently quadratic quartic skyrme faddeev model. novelty possess bogomolny automatically satisfy euler lagrange equations. possesses saturated bogomolny solutions. bogomolny possesses solutions. chandrasekhar prevents tridimensional bogomolny sphere toroidal pages
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non_dup
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[] |
24932631
|
10.1007/JHEP09(2013)099
|
A rather high Higgs mass, m_h = 126 GeV, suggests that at least a part of the
supersymmetric spectrum of the MSSM may live beyond O(1TeV) and hence
inaccessible to the LHC. However, there are theoretical and phenomenological
reasons supporting a possibility that charginos and neutralinos remain much
closer to the electroweak scale. In this paper, we explore such a scenario in
the light of recent Higgs measurements, mainly its di-photon decay rate, where
the data might indicate a slight excess over the SM prediction. That excess
could be fitted by the contribution of light charginos provided tan(beta) is
low to moderate, a possibility that is receiving much attention for other
theoretical reasons. We investigate the implications of this scenario for other
observables, such as dark matter constraints, electroweak observables and
experimental signals at the LHC, like di-lepton, tri-lepton and same-sign
dilepton. An important part of the models survive all the constraints and are
able to give positive signals at LHC-14TeV and/or XENON1T.Comment: 21 pages, 10 figure
|
Implications of light charginos for Higgs observables, LHC searches and
dark matter
|
implications of light charginos for higgs observables, lhc searches and dark matter
|
supersymmetric mssm live inaccessible lhc. phenomenological reasons supporting charginos neutralinos closer electroweak scale. explore slight excess prediction. excess fitted charginos beta moderate receiving reasons. observables electroweak observables lepton lepton dilepton. survive pages
|
non_dup
|
[] |
24952898
|
10.1007/JHEP09(2013)101
|
We study the stability of extreme Reissner-Nordstr\"om-AdS black hole under
massless scalar perturbations. We show that the perturbation on the horizon of
the extreme Reissner-Nordstr\"om-AdS black hole experiences a power-law decay,
instead of an exponential decay as observed in the nonextreme AdS black hole.
On the horizon of the extreme Reissner-Nordstr\"om-AdS black hole, the blow up
happens at lower order derivative of the scalar field compared with that of the
extreme Reissner-Nordstr\"om black hole, which shows that extreme AdS black
holes tend to instability in comparison to black holes in asymptotic flat
space-times.Comment: 20 pages,7 figures, match published versio
|
Horizon instability of massless scalar perturbations of an extreme
Reissner-Nordstr\"om-AdS black hole
|
horizon instability of massless scalar perturbations of an extreme reissner-nordstr\"om-ads black hole
|
extreme reissner nordstr massless perturbations. perturbation horizon extreme reissner nordstr experiences exponential nonextreme hole. horizon extreme reissner nordstr blow happens extreme reissner nordstr extreme holes tend instability holes asymptotic pages match versio
|
non_dup
|
[] |
24932102
|
10.1007/JHEP09(2013)102
|
We analyze momentum dependent vector modes in the context of gauge theories
dual to R-charged black holes in $D=4$, $5$ and $7$. For a variety of examples,
the master variables are constructed, for which the linearized equations for
the perturbations decouple. These allow for the computation of momentum
dependent correlation functions. Away from the hydrodynamic limit, numerical
analysis using the decoupled equations of motion is used to obtain the
analogues of the Depine-Lakhtakia (DL) index. For specified ranges of
frequencies, a negative index of refraction is seen to occur in all cases.Comment: 1 + 26 Pages, LaTeX, 8 .eps figures. Some discussions expanded.
Published versio
|
R-Charged Black Holes and Holographic Optics
|
r-charged black holes and holographic optics
|
analyze holes master linearized perturbations decouple. functions. away hydrodynamic decoupled analogues depine lakhtakia index. specified ranges refraction pages latex .eps figures. discussions expanded. versio
|
non_dup
|
[] |
24935634
|
10.1007/JHEP09(2013)107
|
We discuss, for the first time, the role of the superpotential couplings of
three messenger fields in a GMSB-type unification model in which messenger
sector consists of both 5+5bar and 10+10bar of SU(5). It turns out that these
interactions are relevant when coexist with appropriate messenger-MSSM
couplings. Then they induce extra contributions to 2-loop soft masses. In the
present model, we derive all such soft terms and discuss constraints which have
to be satisfied to avoid rapid proton decay and mu/B_mu problem. As an example,
it is shown how superpotential couplings of three messengers influence mass
spectra when the model is restricted by additional global U(1)_q symmetry. We
find that masses of the lightest sleptons are the most sensitive to those new
interactions, what in some cases results in the NLSP/NNLSP pattern in which
stau or selectron is lighter than the lightest neutralino.Comment: 20 pages, 3 figures, 16 table
|
On messengers couplings in extended GMSB models
|
on messengers couplings in extended gmsb models
|
superpotential couplings messenger gmsb unification messenger turns coexist messenger mssm couplings. induce extra masses. derive satisfied avoid proton problem. superpotential couplings messengers restricted symmetry. lightest sleptons nlsp nnlsp stau selectron lighter lightest pages
|
non_dup
|
[] |
24941555
|
10.1007/JHEP09(2013)109
|
The Renyi entropies and entanglement entropy of 1+1 CFTs with gravity duals
can be computed by explicit construction of the bulk spacetimes dual to
branched covers of the boundary geometry. At the classical level in the bulk
this has recently been shown to reproduce the conjectured Ryu-Takayanagi
formula for the holographic entanglement entropy. We study the one-loop bulk
corrections to this formula. The functional determinants in the bulk geometries
are given by a sum over certain words of generators of the Schottky group of
the branched cover. For the case of two disjoint intervals on a line we obtain
analytic answers for the one-loop entanglement entropy in an expansion in small
cross-ratio. These reproduce and go beyond anticipated universal terms that are
not visible classically in the bulk. We also consider the case of a single
interval on a circle at finite temperature. At high temperatures we show that
the one-loop contributions introduce expected finite size corrections to the
entanglement entropy that are not present classically. At low temperatures, the
one-loop corrections capture the mixed nature of the density matrix, also not
visible classically below the Hawking-Page temperature.Comment: 1+41 pages. Three figures. v2 References adde
|
Holographic entanglement beyond classical gravity
|
holographic entanglement beyond classical gravity
|
renyi entropies entanglement cfts duals spacetimes branched covers geometry. reproduce conjectured takayanagi holographic entanglement entropy. formula. determinants geometries generators schottky branched cover. disjoint intervals analytic answers entanglement ratio. reproduce anticipated universal visible classically bulk. circle temperature. entanglement classically. capture visible classically hawking pages. figures. adde
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non_dup
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[] |
24938706
|
10.1007/JHEP09(2013)111
|
We present an explicit analytic calculation of the differential of the planar
n-particle, two-loop MHV scattering amplitude in N=4 super Yang-Mills theory.
The result is expressed only in terms of the polylogarithm functions Li_k(-x),
for k=1,2,3, with arguments x belonging to the special class of dual conformal
cross-ratios known as cluster X-coordinates. The surprising fact that these
amplitudes may be expressed in this way provides a striking example of the
manner in which the cluster structure on the kinematic configuration space
underlies the structure of amplitudes in SYM theory.Comment: 10 pages. v2: typos corrected, some formulas replaced with more
concise versions. v3: discussion of parity added, other minor additions based
on JHEP reviewer comment
|
The Differential of All Two-Loop MHV Amplitudes in N=4 Yang-Mills Theory
|
the differential of all two-loop mhv amplitudes in n=4 yang-mills theory
|
analytic planar super mills theory. polylogarithm arguments belonging conformal coordinates. surprising amplitudes striking manner kinematic underlies amplitudes pages. typos corrected formulas replaced concise versions. parity minor additions jhep reviewer comment
|
non_dup
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[] |
24939259
|
10.1007/JHEP09(2013)112
|
We consider D-dimensional Einstein gravity coupled to two U(1) fields and a
dilaton with a scalar potential. We derive the condition that the analytical
AdS black holes with two independent charges can be constructed. Turning off
the cosmological constant, the extremal Reissner-Nordstrom black hole emerges
as the harmonic superposition of the two U(1) building blocks. With the
non-vanishing cosmological constant, our extremal solutions contain the
near-horizon geometry of AdS_2 x R^{D-2} with or without a hyperscaling. We
also obtain the magnetic AdS_{D-2} x Y^2 vacua where Y^2 can be R^2, S^2 or
hyperbolic 2-space. These vacua arise as the fix points of some super
potentials and recover the known supersymmetric vacua when the theory can be
embedded in gauged supergravities. The AdS_{D-2} x R^2 vacua are of particular
interest since they are dual to some quantum field theories at the lowest
Landau level. By studying the embedding of some of these solutions in the
string and M-theory, we find that the M2/M5-system with the equal M2 and M5
charges can intersect with another such M2/M5 on to a dyonic black hole.
Analogous intersection rule applies also to the D1/D5-system. The intersections
are non-supersymmetric but in the manner of harmonic superpositions.Comment: Latex, 26 pages, typos corrected and references added. To appear in
JHE
|
Charged Dilatonic AdS Black Holes and Magnetic AdS_{D-2} x R^2 Vacua
|
charged dilatonic ads black holes and magnetic ads_{d-2} x r^2 vacua
|
einstein dilaton potential. derive holes charges constructed. turning cosmological extremal reissner nordstrom emerges harmonic superposition blocks. vanishing cosmological extremal horizon hyperscaling. vacua hyperbolic space. vacua arise super potentials recover supersymmetric vacua embedded gauged supergravities. vacua landau level. studying embedding charges intersect dyonic hole. analogous intersection applies system. intersections supersymmetric manner harmonic latex pages typos corrected added.
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non_dup
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[] |
24939667
|
10.1007/JHEP09(2013)115
|
We show explicitly how the high energy QCD evolution generated by the KLWMIJ
Hamiltonian can be cast in the form of the QCD Reggeon Field Theory. We show
how to reduce the KLWMIJ Hamitonian to physical color singlet degrees of
freedom. We suggest a natural way of defining the Pomeron and other Reggeons in
the framework of the KLWMIJ evolution and derive the QCD Reggeon Field Theory
Hamiltonian which includes several lowest Reggeon operators. This Hamiltonian
generates evolution equations for all Reggeons in the case of dilute-dense
scattering, including the nonlinear Balitsky-Kovchegov equation for the
Pomeron. We also find explicit expressions for the Reggeon conjugate operators
in terms of QCD operators, and derive their evolution equations. This provides
a natural and unambiguous framework for reggeization procedure introduced in
\cite{BW, BE}. The Bartels triple Pomeron vertex is inherited directly from the
RFT Hamiltonian. For simplicity in the bulk of the paper we work in the large
$N_c$ limit.Comment: 44 pages; few typos corrected; a few comments and a couple of refs
adde
|
QCD Reggeon Calculus From KLWMIJ/JIMWLK Evolution: Vertices,
Reggeization and All
|
qcd reggeon calculus from klwmij/jimwlk evolution: vertices, reggeization and all
|
explicitly klwmij cast reggeon theory. klwmij hamitonian singlet freedom. defining pomeron reggeons klwmij derive reggeon reggeon operators. generates reggeons dilute dense balitsky kovchegov pomeron. expressions reggeon conjugate derive equations. unambiguous reggeization cite bartels triple pomeron inherited hamiltonian. simplicity pages typos corrected comments couple refs adde
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non_dup
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[] |
24938369
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10.1007/JHEP09(2013)116
|
We examine maximal unitarity in the nonplanar case and derive remarkably
compact analytic expressions for coefficients of master integrals with two-loop
crossed box topology in massless four-point amplitudes in any gauge theory,
thereby providing additional steps towards automated computation of the full
amplitude. The coefficients are obtained by assembling residues extracted
through integration on linear combinations of higher-dimensional tori
encircling global poles of the loop integrand. We recover all salient features
of two-loop maximal unitarity, such as the existence of unique projectors for
each master integral. Several explicit calculations are provided. We also
establish exact equivalence of our results and master integral coefficients
recently obtained via integrand-level reduction in any renormalizable gauge
theory.Comment: 38 pages, v2: minor changes, typos corrected, references added,
journal versio
|
Global Residues and Two-Loop Hepta-Cuts
|
global residues and two-loop hepta-cuts
|
examine maximal unitarity nonplanar derive remarkably analytic expressions master integrals crossed topology massless amplitudes thereby automated amplitude. assembling combinations tori encircling poles integrand. recover salient maximal unitarity projectors master integral. provided. establish equivalence master integrand renormalizable pages minor typos corrected versio
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non_dup
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[] |
24943504
|
10.1007/JHEP09(2013)117
|
We study the squark spectra of Flavored Gauge Mediation Models, in which
messenger-matter superpotential couplings generate new, generation-dependent
contributions to the squark masses. The new couplings are controlled by the
same flavor symmetry that explains the fermion masses, leading to excellent
alignment of the quark and squark mass matrices. This allows for large squark
mass splittings consistent with all flavor bounds. In particular,
second-generation squarks are often significantly lighter than the
first-generation squarks. As squark production at the LHC is dominated by the
up- and down-squarks and the efficiencies for squark searches increase with
their masses, the charm and/or strange squark masses can be well below the
current LHC bounds. At the same time, even with a single set of messengers, the
models can generate large stop mixings which result in large loop contributions
to the Higgs mass.Comment: 16 pages, 2 figures. v2: Typo corrected, references adde
|
Non-Degenerate Squarks from Flavored Gauge Mediation
|
non-degenerate squarks from flavored gauge mediation
|
squark flavored mediation messenger superpotential couplings squark masses. couplings flavor explains fermion excellent alignment squark matrices. squark splittings flavor bounds. squarks lighter squarks. squark dominated squarks efficiencies squark searches charm strange squark bounds. messengers stop mixings pages figures. typo corrected adde
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non_dup
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[] |
24930285
|
10.1007/JHEP09(2013)119
|
The supersymmetric particles (sparticles) belonging exclusively to the
electroweak sector of the minimal supersymmetric standard model (MSSM) may hold
the key to the observed dark matter relic density in the universe even if all
strongly interacting sparticles are very heavy. The importance of the light EW
sparticles in DM physics and in producing spectacular collider signals is
emphasized. It is shown that even the preliminary data on the direct searches
of these sparticles at the LHC, significantly constrain the parameter space of
the MSSM compatible with the observed relic density and provide useful hints
about the future search prospects. If in addition to the electroweak sparticles
the gluinos are also within the reach of the LHC experiments, then the gluino
mass limits in the light slepton scenario obtained via the canonical jets +
$\met$ channel may be relaxed by as much as 25 $%$ compared to the existing
limits. But the corresponding same sign dilepton (SSD) + jets + $\met$ signal
will yield enhanced limits competitive with the strongest limits currently
available. This is illustrated with the help of benchmark scenarios at the
generator level using PYTHIA. If the gluinos are just beyond the current reach
of the LHC, then the generic n-lepton + m-jets + missing energy signal may
discriminate between different DM producing mechanisms by comparing the signals
corresponding to different values of n. This is illustrated by simulating the
signals for n = 0 and n = 2 (the SSD signal).Comment: 37 pages, 5 figures; published in JHE
|
Neutralino dark matter confronted by the LHC constraints on Electroweak
SUSY signals
|
neutralino dark matter confronted by the lhc constraints on electroweak susy signals
|
supersymmetric sparticles belonging exclusively electroweak supersymmetric mssm hold relic universe interacting sparticles heavy. sparticles producing spectacular collider emphasized. preliminary searches sparticles constrain mssm compatible relic hints prospects. electroweak sparticles gluinos gluino slepton canonical jets relaxed limits. dilepton jets competitive strongest available. illustrated benchmark scenarios generator pythia. gluinos generic lepton jets missing discriminate producing illustrated simulating .comment pages
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non_dup
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[] |
84457263
|
10.1007/JHEP09(2013)123
|
We show that the classical cosmological constant in type II flux compactifications can be written as a sum of terms from the action of localized sources plus a specific contribution from non-trivial background fluxes. Exploiting two global scaling symmetries of the classical supergravity action, we find that the flux contribution can in many interesting cases be set to zero such that the cosmological constant is fully determined by the boundary conditions of the fields in the near-source region. This generalizes and makes more explicit previous arguments in the literature. We then discuss the problem of putting D3-branes at the tip of the Klebanov-Strassler throat glued to a compact space in type IIB string theory so as to engineer a de Sitter solution. Our result for the cosmological constant and a simple global argument indicate that inserting a fully localized and backreacting (D3) over bar -brane into such a background yields a singular energy density for the NSNS and RR 3-form field strengths at the (D3) over bar -brane. This argument does not rely on partial smearing of the (D3) over bar -brane or a linearization of field equations, but on a few general assumptions that we also discuss carefully
|
Cosmological constant, near brane behavior and singularities
|
cosmological constant, near brane behavior and singularities
|
cosmological compactifications localized trivial fluxes. exploiting symmetries supergravity cosmological region. generalizes arguments literature. putting branes klebanov strassler throat glued engineer sitter solution. cosmological argument inserting localized backreacting brane singular nsns strengths brane. argument rely smearing brane linearization assumptions carefully
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non_dup
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[] |
24947067
|
10.1007/JHEP09(2013)125
|
When supergravity (SUGRA) is spontaneously broken, it is well known that
anomaly mediation generates sparticle soft masses proportional to the gravitino
mass. Recently, we showed that one-loop anomaly-mediated gaugino masses should
be associated with unbroken supersymmetry (SUSY). This counterintuitive result
arises because the underlying symmetry structure of (broken) SUGRA in flat
space is in fact (unbroken) SUSY in anti-de Sitter (AdS) space. When quantum
corrections are regulated in a way that preserves SUGRA, the underlying AdS
curvature (proportional to the gravitino mass) necessarily appears in the
regulated action, yielding soft masses without corresponding goldstino
couplings. In this paper, we extend our analysis of anomaly mediation to
sfermion soft masses. Already at tree-level we encounter a number of surprises,
including the fact that zero soft masses correspond to broken (AdS) SUSY. At
one-loop, we explain how anomaly mediation appears when regulating SUGRA in a
way that preserves super-Weyl invariance. We find that recent claims in the
literature about the non-existence of anomaly mediation were based on a
Wilsonian effective action with residual gauge dependence, and the
gauge-invariant 1PI effective action contains the expected anomaly-mediated
spectrum. Finally, we calculate the sfermion spectrum to all orders, and use
supertrace relations to derive the familiar two-loop soft masses from minimal
anomaly mediation, as well as unfamiliar tree-level and one-loop goldstino
couplings consistent with renormalization group invariance.Comment: 45 pages, 4 figures, 1 tabl
|
Anomaly Mediation from Unbroken Supergravity
|
anomaly mediation from unbroken supergravity
|
supergravity sugra spontaneously broken anomaly mediation generates sparticle gravitino mass. anomaly gaugino unbroken supersymmetry susy counterintuitive arises broken sugra unbroken susy sitter space. regulated preserves sugra curvature gravitino necessarily regulated yielding goldstino couplings. extend anomaly mediation sfermion masses. encounter surprises broken susy. anomaly mediation regulating sugra preserves super weyl invariance. claims anomaly mediation wilsonian residual anomaly spectrum. sfermion orders supertrace derive familiar anomaly mediation unfamiliar goldstino couplings renormalization pages tabl
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non_dup
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24945134
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10.1007/JHEP09(2013)128
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Recently, it was argued that the thermal deconfinement transition in pure
Yang-Mills theory is continuously connected to a quantum phase transition in
softly-broken N=1 SYM theory on R^3 x S^1. The transition is semiclassically
calculable at small S^1 size L, occurs as the soft mass m_soft and L vary, and
is driven by a competition between perturbative effects and nonperturbative
topological molecules. These are correlated instanton--anti-instanton tunneling
events, whose constituents are monopole-instantons "bound" by attractive
long-range forces. The mechanism driving the transition is universal for all
simple gauge groups, with or without a center, such as SU(N) or G_2. Here, we
consider theories with fundamental quarks. We examine the role topological
objects play in determining the fate of the (exact or approximate)
center-symmetry in SU(2) SQCD, with or without soft-breaking terms. In theories
whose large-m_soft limit is thermal nonsupersymmetric QCD with massive quarks,
we find a crossover of the Polyakov loop, from approximately center-symmetric
at small 1/L to maximally center-broken at larger 1/L, as seen in lattice
thermal QCD with massive quarks and T=1/L. We argue that in all calculable
cases, including SQCD with exact center symmetry, quarks deform
instanton-monopoles by their quantum fluctuations and do not contribute to
their binding. The semiclassical approximation and the molecular picture of the
vacuum fail, upon decreasing the quark mass, precisely when quarks would begin
mediating a long-range attractive force between monopole-instantons, calling
for a dual description of the resulting strong-coupling theory.Comment: 40 pages, 2 figure
|
(S)QCD on R^3 x S^1: Screening of Polyakov loop by fundamental quarks
and the demise of semi-classics
|
(s)qcd on r^3 x s^1: screening of polyakov loop by fundamental quarks and the demise of semi-classics
|
argued deconfinement mills continuously softly broken semiclassically calculable vary competition perturbative nonperturbative topological molecules. instanton instanton tunneling constituents monopole instantons attractive forces. driving universal quarks. examine topological determining fate approximate sqcd breaking terms. nonsupersymmetric massive quarks crossover polyakov maximally broken massive quarks argue calculable sqcd quarks deform instanton monopoles binding. semiclassical picture fail decreasing precisely quarks begin mediating attractive monopole instantons calling pages
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non_dup
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24941454
|
10.1007/JHEP09(2013)129
|
We study the impact of heavy-quark masses in Higgs boson production through
gluon fusion at the LHC. We extend previous computations of the fully
differential cross section and of the transverse momentum spectrum of the Higgs
boson by taking into account the finite top- and bottom-quark masses up to
O(alpha_S^3). We also discuss the issues arising when the heavy-quark mass is
much smaller than the Higgs mass. Our results are implemented in updated
versions of the HNNLO and HRes numerical programs.Comment: Minor modifications, results unchanged. Discussion on uncertainties
added. Version published on JHE
|
Heavy-quark mass effects in Higgs boson production at the LHC
|
heavy-quark mass effects in higgs boson production at the lhc
|
boson gluon fusion lhc. extend computations boson alpha arising mass. implemented updated versions hnnlo hres minor modifications unchanged. added.
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non_dup
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24944123
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10.1007/JHEP09(2013)132
|
By applying an hyperbolic deformation to the uniformization problem for the
infinite strip, we give a method for computing the accessory parameter for the
torus with one source as an expansion in the modular parameter q. At O(q^0) we
obtain the same equation for the accessory parameter and the same value of the
semiclassical action as the one obtained from the b -> 0 limit of the quantum
one point function. The procedure can be carried over to the full O(q^2) or
even higher order corrections although the procedure becomes somewhat
complicated. Here we compute to order q^2 the correction to the weight
parameter intervening in the conformal factor and it is shown that the unwanted
contribution O(q) to the accessory parameter equation cancel exactly.Comment: 20 pages LaTeX, corrected typo
|
Hyperbolic deformation of the strip-equation and the accessory
parameters for the torus
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hyperbolic deformation of the strip-equation and the accessory parameters for the torus
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hyperbolic deformation uniformization infinite strip accessory torus modular accessory semiclassical function. somewhat complicated. intervening conformal unwanted accessory cancel pages latex corrected typo
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non_dup
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24934609
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10.1007/JHEP09(2013)133
|
In this paper we provide a first attempt towards a toric geometric
interpretation of scattering amplitudes. In recent investigations it has indeed
been proposed that the all-loop integrand of planar N=4 SYM can be represented
in terms of well defined finite objects called on-shell diagrams drawn on
disks. Furthermore it has been shown that the physical information of on-shell
diagrams is encoded in the geometry of auxiliary algebraic varieties called the
totally non negative Grassmannians. In this new formulation the infinite
dimensional symmetry of the theory is manifest and many results, that are quite
tricky to obtain in terms of the standard Lagrangian formulation of the theory,
are instead manifest. In this paper, elaborating on previous results, we
provide another picture of the scattering amplitudes in terms of toric
geometry. In particular we describe in detail the toric varieties associated to
an on-shell diagram, how the singularities of the amplitudes are encoded in
some subspaces of the toric variety, and how this picture maps onto the
Grassmannian description. Eventually we discuss the action of cluster
transformations on the toric varieties. The hope is to provide an alternative
description of the scattering amplitudes that could contribute in the
developing of this very interesting field of research.Comment: 58 pages, 25 figures, typos corrected, a reference added, to be
published in JHE
|
Scattering Amplitudes and Toric Geometry
|
scattering amplitudes and toric geometry
|
attempt toric geometric amplitudes. investigations integrand planar diagrams drawn disks. diagrams encoded auxiliary algebraic varieties totally grassmannians. formulation infinite manifest tricky lagrangian formulation manifest. elaborating picture amplitudes toric geometry. toric varieties singularities amplitudes encoded subspaces toric picture grassmannian description. eventually transformations toric varieties. hope amplitudes pages typos corrected
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non_dup
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24947239
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10.1007/JHEP09(2013)135
|
We associate vertex operators to space-time diffeomorphisms in flat space
string theory, and compute their algebra, which is a diffeomorphism algebra
with higher derivative corrections. As an application, we realize the
asymptotic symmetry group BMS3 of three-dimensional flat space in terms of
vertex operators on the string worldsheet. This provides an embedding of the
BMS3 algebra in a consistent theory of quantum gravity. Higher derivative
corrections vanish asymptotically. An appendix is dedicated to alpha prime
corrected algebras in conformal field theory and string theory.Comment: 25 page
|
Asymptotic symmetry groups and operator algebras
|
asymptotic symmetry groups and operator algebras
|
associate diffeomorphisms diffeomorphism corrections. realize asymptotic worldsheet. embedding gravity. vanish asymptotically. dedicated alpha prime corrected algebras conformal
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non_dup
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24945515
|
10.1007/JHEP09(2013)137
|
Infrared- and collinear-safe (IRC-safe) observables have finite cross
sections to each fixed-order in perturbative QCD. Generically, ratios of
IRC-safe observables are themselves not IRC safe and do not have a valid
fixed-order expansion. Nevertheless, in this paper we present an explicit
method to calculate the cross section for a ratio observable in perturbative
QCD with the help of resummation. We take the IRC-safe jet angularities as an
example and consider the ratio formed from two angularities with different
angular exponents. While the ratio observable is not IRC safe, it is "Sudakov
safe", meaning that the perturbative Sudakov factor exponentially suppresses
the singular region of phase space. At leading logarithmic (LL) order, the
distribution is finite but has a peculiar expansion in the square root of the
strong coupling constant, a consequence of IRC unsafety. The accuracy of the LL
distribution can be further improved with higher-order resummation and
fixed-order matching. Non-perturbative effects can sometimes give rise to order
one changes in the distribution, but at sufficiently high energies Q, Sudakov
safety leads to non-perturbative corrections that scale like a (fractional)
power of 1/Q, as is familiar for IRC-safe observables. We demonstrate that
Monte Carlo parton showers give reliable predictions for the ratio observable,
and we discuss the prospects for computing other ratio observables using our
method.Comment: 41 pages, 14 figures, 1 table, small changes in v.
|
Unsafe but Calculable: Ratios of Angularities in Perturbative QCD
|
unsafe but calculable: ratios of angularities in perturbative qcd
|
infrared collinear safe safe observables perturbative qcd. generically safe observables safe valid expansion. nevertheless observable perturbative resummation. safe angularities angularities exponents. observable safe sudakov safe meaning perturbative sudakov exponentially suppresses singular space. logarithmic peculiar unsafety. resummation matching. perturbative sometimes sufficiently sudakov perturbative fractional familiar safe observables. monte carlo parton showers reliable observable prospects observables pages
|
non_dup
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[] |
24950056
|
10.1007/JHEP09(2013)139
|
We present measurements of absolute branching fractions of hadronic and
leptonic Ds+ decays to K- K+ pi+, anti-K0 K+, eta pi+, mu+ nu_mu and tau+
nu_tau and report a search for the leptonic Ds+ to e+ nu_e decays. The results
are obtained from a data sample of 913 fb^-1 collected at or near the Y(4S) and
Y(5S) resonances with the Belle detector at the KEKB asymmetric-energy e+e-
collider. The branching fractions of hadronic decays are measured to be Br(Ds+
-> K- K+ pi+) = (5.06 +- 0.15 +- 0.21)%, Br(Ds+ -> anti-K0 K+) = (2.95 +- 0.11
+- 0.09)%, and Br(Ds+ -> eta pi+) = (1.82 +- 0.14 +- 0.07)%, where the first
and second uncertainties are statistical and systematic, respectively. The
branching fractions of leptonic decays are measured to be Br(Ds+ -> mu+ nu_mu)
= (0.531 +- 0.028 +- 0.020)%, and Br(Ds+ -> tau+ nu_tau) = (5.70 +- 0.21
+0.31-0.30)%, which are combined to determine the Ds+ meson decay constant f_Ds
= (255.5 +- 4.2 +- 5.1) MeV. We find no significant signal for Ds+ -> e+ nu_e
decays and set an upper limit of Br(Ds+ -> e+ nu_e) < 1.0 (0.83) x 10^-4 at 95%
(90%) confidence level.Comment: 31 pages, 9 figure
|
Measurements of branching fractions of leptonic and hadronic Ds+ meson
decays and extraction of the Ds+ meson decay constant
|
measurements of branching fractions of leptonic and hadronic ds+ meson decays and extraction of the ds+ meson decay constant
|
branching fractions hadronic leptonic decays leptonic decays. resonances belle kekb asymmetric collider. branching fractions hadronic decays respectively. branching fractions leptonic decays meson mev. decays confidence pages
|
non_dup
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[] |
24932635
|
10.1007/JHEP09(2013)143
|
We study the physics of two-dimensional N=(2,2) gauged linear sigma models
(GLSMs) via the two-sphere partition function. We show that the classical phase
boundaries separating distinct GLSM phases, which are described by the
secondary fan construction for abelian GLSMs, are completely encoded in the
analytic structure of the partition function. The partition function of a
non-abelian GLSM can be obtained as a limit from an abelian theory; we utilize
this fact to show that the phases of non-abelian GLSMs can be obtained from the
secondary fan of the associated abelian GLSM. We prove that the partition
function of any abelian GLSM satisfies a set of linear differential equations;
these reduce to the familiar A-hypergeometric system of Gel'fand, Kapranov, and
Zelevinski for GLSMs describing complete intersections in toric varieties. We
develop a set of conditions that are necessary for a GLSM phase to admit an
interpretation as the low-energy limit of a non-linear sigma model with a
Calabi-Yau threefold target space. Through the application of these criteria we
discover a class of GLSMs with novel geometric phases corresponding to
Calabi-Yau manifolds that are branched double-covers of Fano threefolds. These
criteria provide a promising approach for constructing new Calabi-Yau
geometries.Comment: 25 pages + references, appendices. v2: references added, typos
corrected. v3: two small typos correcte
|
New Methods for Characterizing Phases of 2D Supersymmetric Gauge
Theories
|
new methods for characterizing phases of 2d supersymmetric gauge theories
|
gauged sigma glsms sphere partition function. boundaries separating glsm abelian glsms encoded analytic partition function. partition abelian glsm abelian utilize abelian glsms abelian glsm. partition abelian glsm satisfies familiar hypergeometric fand kapranov zelevinski glsms describing intersections toric varieties. glsm admit sigma calabi threefold space. discover glsms geometric calabi manifolds branched covers fano threefolds. promising constructing calabi pages appendices. typos corrected. typos correcte
|
non_dup
|
[] |
24936887
|
10.1007/JHEP09(2013)144
|
We obtain the asymptotic symmetry algebra of sl(3,R) x sl(3,R) Chern-Simons
theory with Dirichlet boundary conditions for fixed chemical potential. These
boundary conditions are obeyed by higher spin black holes. For each embedding
of sl(2,R) into sl(3,R), we show that the asymptotic symmetry group is
independent of the chemical potential. On the one hand, starting from AdS3 in
the principal embedding, we show that the W3 x W3 symmetry is preserved upon
turning on perturbatively spin 3 chemical potentials. On the other hand,
starting from AdS3 in the diagonal embedding, we show that the W3^(2) x W3^(2)
symmetry is preserved upon turning on finite spin 3/2 chemical potentials. We
also make connections between the canonical Lagrangian formalism and
integrability methods based on the third KdV (Boussinesq) hierarchy.Comment: 40 pages, typos corrected, refs added, published versio
|
W Symmetry and Integrability of Higher spin black holes
|
w symmetry and integrability of higher spin black holes
|
asymptotic chern simons dirichlet potential. obeyed holes. embedding asymptotic potential. principal embedding preserved turning perturbatively potentials. diagonal embedding preserved turning potentials. connections canonical lagrangian formalism integrability boussinesq pages typos corrected refs versio
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non_dup
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[] |
24944313
|
10.1007/JHEP09(2013)151
|
New particles entering into self-energies of the Higgs boson would
necessarily modify loop-induced couplings of the Higgs, if the new particle
carries standard model gauge quantum numbers. For a 1 TeV new particle,
deviations in these "Higgs oblique corrections" are generically of the order of
v^2/(1 TeV)^2 ~ 5%. We study constraints on masses and couplings of new scalars
and fermions that can be derived from 5-10% deviations in the Higgs digluon and
diphoton partial widths. To reduce theoretical uncertainties, we present
next-to-leading order QCD corrections to the Higgs-to-digluon coupling for
scalars and fermions in arbitrary representations of SU(3) color group, by
applying the low-energy Higgs theorems at two-loop order. As a by-product we
provide a new value for NLO QCD corrections to the top squark contributions to
digluon decays that differs from existing literature. We also emphasize that
precise measurements of Higgs couplings to W boson and top quark are
prerequisite to precise determinations of Higgs oblique corrections from new
particles.Comment: 27 pages, 6 figures, References added, Fig.4 slightly corrected,
conclusions unchanged. Published in JHE
|
Precision Higgs Measurements: Constraints from New Oblique Corrections
|
precision higgs measurements: constraints from new oblique corrections
|
entering boson necessarily modify couplings carries numbers. deviations oblique generically couplings scalars fermions deviations digluon diphoton widths. digluon scalars fermions representations theorems order. squark digluon decays differs literature. emphasize precise couplings boson prerequisite precise determinations oblique pages fig. corrected unchanged.
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non_dup
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[] |
24800514
|
10.1007/JHEP09(2013)154
|
We construct global F-theory GUTs with SU(5) x U(1) gauge group defined by
specifying a fully resolved Calabi-Yau fourfold and consistent four-form
G-flux. Its specific U(1) charged matter spectrum allows the desired Yukawa
couplings, but forbids dangerous proton decay operators. The model we find: (1)
does not follow from an underlying higgsed E8 gauge group (2) leaves the class
of theories that can be analyzed with current split-spectral cover techniques.
This avoids recently proposed no-go theorems for models with hypercharge flux,
as required to break the GUT group. The appearance of additional fields is
related geometrically to considering a more general class of sections and 4-1
splits. We show explicitly that the four-dimensional chiral matter index can
still be computed using three-dimensional one-loop Chern-Simons terms.Comment: 24 pages, 2 figure
|
New Global F-theory GUTs with U(1) symmetries
|
new global f-theory guts with u(1) symmetries
|
guts specifying resolved calabi fourfold flux. desired yukawa couplings forbids dangerous proton operators. higgsed leaves split cover techniques. avoids theorems hypercharge break group. appearance geometrically splits. explicitly chiral chern simons pages
|
non_dup
|
[] |
24944604
|
10.1007/JHEP09(2013)157
|
We present a complete two-loop analysis of the quantum expectation value for
circular BPS Wilson loops in ABJ(M) theories. We examine in details the 1/2 BPS
case, that requires non-trivial fermionic couplings with the contour, finding
perfect agreement with the exact matrix model answer at zero framing. The
result is obtained through a careful application of DRED regularization scheme,
combined with a judicious rearrangement of the relevant perturbative
contributions that reduces the computation to simple integrals. We carefully
analyze the contribution of fermions that is crucial for the consistency with
the localization procedure and point out the arising of pivotal evanescent
terms, discussing their meaning in relation to Ward identities.Comment: 32 pages, 5 figures, Referemces adde
|
Perturbative evaluation of circular 1/2 BPS Wilson loops in N = 6 Super
Chern-Simons theories
|
perturbative evaluation of circular 1/2 bps wilson loops in n = 6 super chern-simons theories
|
expectation circular wilson loops theories. examine trivial fermionic couplings contour perfect answer framing. careful dred regularization judicious rearrangement perturbative reduces integrals. carefully analyze fermions crucial consistency localization arising pivotal evanescent discussing meaning ward pages referemces adde
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non_dup
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