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95351231
|
10.1007/JHEP08(2012)053
|
We determine the equation of state of QCD for nonzero chemical potentials via a Taylor expansion of the pressure. The results are obtained for N-f = 2 + 1 flavors of quarks with physical masses, on various lattice spacings. We present results for the pressure, interaction measure, energy density, entropy density, and the speed of sound for small chemical potentials. At low temperatures we compare our results with the Hadron Resonance Gas model. We also express our observables along trajectories of constant entropy over particle number. A simple parameterization is given (the Matlab/Octave script parameterization.m, submitted to the arXiv along with the paper), which can be used to reconstruct the observables as functions of T and mu, or as functions of T and S/N
|
QCD equation of state at nonzero chemical potential: continuum results with physical quark masses at order mu(2)
|
qcd equation of state at nonzero chemical potential: continuum results with physical quark masses at order mu(2)
|
nonzero potentials taylor pressure. flavors quarks spacings. sound potentials. hadron model. express observables trajectories number. parameterization matlab octave script parameterization.m submitted reconstruct observables
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non_dup
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[] |
5256828
|
10.1007/JHEP08(2012)054
|
We discuss the "wrong"-sign DBI theory as a prototype for classicalization.
The theory lacks a UV completion and has to be defined with a fundamental UV
cutoff. We study a quantum-mechanical toy model with similar properties. The
model has a fundamental length scale and all physical states have momenta below
the inverse of this scale. We show that, despite the terminology, the
phenomenon of classicalization is of a quantum nature. Within the toy model it
consists essentially of tunnelling through a region that is classically
forbidden. The size of this region is proportional to the square root of the
energy and can be much larger than the fundamental length scale. We discuss the
implications for classicalization in scalar field theories.Comment: 21 pages, 10 figures, references adde
|
Classicalization as a tunnelling phenomenon
|
classicalization as a tunnelling phenomenon
|
wrong prototype classicalization. lacks completion cutoff. properties. momenta scale. terminology phenomenon classicalization nature. essentially tunnelling classically forbidden. scale. classicalization pages adde
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non_dup
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[] |
5236114
|
10.1007/JHEP08(2012)057
|
We discuss novel properties of the string field and the Open String Field
Theory action arising in a system with multiple D-branes, then use the level
truncation scheme to study marginal deformations and tachyon condensation in a
system with two parallel but separated branes. We find string fields
corresponding to D-brane decay combined with a finite change in the distance
between the two D-branes. Using D-brane separation as a yardstick, we are able
to continuously control the spacetime displacement of the D-branes and find
that our solutions exist only for a finite range of this displacement. Thus, at
least in level truncation, Open String Field Theory seems unable to describe
the entire CFT moduli space.Comment: 25 pages, minor changes and references adde
|
SFT on separated D-branes and D-brane translation
|
sft on separated d-branes and d-brane translation
|
arising branes truncation marginal deformations tachyon condensation separated branes. brane branes. brane yardstick continuously spacetime displacement branes displacement. truncation unable moduli pages minor adde
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non_dup
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[] |
5235697
|
10.1007/JHEP08(2012)058
|
The relatively large value of $\theta_{13}$ established recently by the Daya
Bay reactor experiment opens the possibility to determine the neutrino mass
ordering with experiments currently under construction. We investigate
synergies between the NOvA long-baseline accelerator experiment with
atmospheric neutrino data from the India-based Neutrino Observatory (INO). We
identify the requirements on energy and direction reconstruction and detector
mass for INO necessary for a significant sensitivity. If neutrino energy and
direction reconstruction at the level of 10% and 10 degree can be achieved by
INO a determination of the neutrino mass ordering seems possible around 2020.Comment: 18 pages, 8 figures, minor improvements and clarifications, new panel
in fig. 7, version to appear in JHEP, typo in eq. 4 correcte
|
Identifying the Neutrino mass Ordering with INO and NOvA
|
identifying the neutrino mass ordering with ino and nova
|
theta daya reactor opens ordering construction. synergies nova accelerator india observatory reconstruction sensitivity. reconstruction ordering pages minor improvements clarifications fig. jhep typo correcte
|
non_dup
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[] |
5255396
|
10.1007/JHEP08(2012)059
|
We discuss collider signatures of the "natural supersymmetry" scenario with
baryon-number violating R-parity violation. We argue that this is one of the
few remaining viable incarnations of weak scale supersymmetry consistent with
full electroweak naturalness. We show that this intriguing and challenging
scenario contains distinctive LHC signals, resonances of hard jets in
conjunction with relatively soft leptons and missing energy, which are easily
overlooked by existing LHC searches. We propose novel strategies for
distinguishing these signals above background, and estimate their potential
reach at the 8 TeV LHC. We show that other multi-lepton signals of this
scenario can be seen by currently existing searches with increased statistics,
but these opportunities are more spectrum-dependent.Comment: 23 pages, 7 figures, 3 tables. V2: spectrum discussion corrected,
most of the changes are in Sec. 2. Benchmarks, analysis and conclusions
unchanged. References adde
|
SUSY Stops at a Bump
|
susy stops at a bump
|
collider signatures supersymmetry baryon violating parity violation. argue viable incarnations supersymmetry electroweak naturalness. intriguing challenging distinctive resonances jets conjunction leptons missing overlooked searches. propose distinguishing lhc. lepton searches opportunities pages tables. corrected sec. benchmarks unchanged. adde
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non_dup
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[] |
5254125
|
10.1007/JHEP08(2012)060
|
Motivated by recent results from Higgs searches at the Large Hadron Collider,
we consider possibilities to enhance the diphoton decay width of the Higgs
boson over the Standard Model expectation, without modifying either its
production rate or the partial widths in the WW and ZZ channels. Studying
effects of new charged scalars, fermions and vector bosons, we find that
significant variations in the diphoton width may be possible if the new
particles have light masses of the order of a few hundred GeV and sizeable
couplings to the Higgs boson. Such couplings could arise naturally if there is
large mass mixing between two charged particles that is induced by the Higgs
vacuum expectation value. In addition, there is generically also a shift in the
Z + Gamma partial width, which in the case of new vector bosons tends to be of
similar magnitude as the shift in the diphoton partial width, but smaller in
other cases. Therefore simultaneous measurements in these two channels could
reveal properties of new charged particles at the electroweak scale.Comment: 29 pages, 8 figures; v2: updated references and minor improvements in
presentations; v3: sign of the scalar contribution to Z+Gamma amplitudes
fixed. Related figures update
|
Implications of a Modified Higgs to Diphoton Decay Width
|
implications of a modified higgs to diphoton decay width
|
motivated searches hadron collider possibilities enhance diphoton boson expectation modifying widths channels. studying scalars fermions bosons diphoton hundred sizeable couplings boson. couplings arise naturally expectation value. generically gamma bosons tends diphoton cases. simultaneous reveal electroweak pages updated minor improvements presentations gamma amplitudes fixed. update
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non_dup
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[] |
5254933
|
10.1007/JHEP08(2012)063
|
We study the dynamics of four dimensional gauge theories with adjoint
fermions for all gauge groups, both in perturbation theory and
non-perturbatively, by using circle compactification with periodic boundary
conditions for the fermions. There are new gauge phenomena. We show that, to
all orders in perturbation theory, many gauge groups are Higgsed by the gauge
holonomy around the circle to a product of both abelian and nonabelian gauge
group factors. Non-perturbatively there are monopole-instantons with fermion
zero modes and two types of monopole-anti-monopole molecules, called bions. One
type are "magnetic bions" which carry net magnetic charge and induce a mass gap
for gauge fluctuations. Another type are "neutral bions" which are magnetically
neutral, and their understanding requires a generalization of multi-instanton
techniques in quantum mechanics - which we refer to as the
Bogomolny-Zinn-Justin (BZJ) prescription - to compactified field theory. The
BZJ prescription applied to bion-anti-bion topological molecules predicts a
singularity on the positive real axis of the Borel plane (i.e., a divergence
from summing large orders in peturbation theory) which is of order N times
closer to the origin than the leading 4-d BPST instanton-anti-instanton
singularity, where N is the rank of the gauge group. The position of the
bion--anti-bion singularity is thus qualitatively similar to that of the 4-d IR
renormalon singularity, and we conjecture that they are continuously related as
the compactification radius is changed. By making use of transseries and
Ecalle's resurgence theory we argue that a non-perturbative continuum
definition of a class of field theories which admit semi-classical expansions
may be possible.Comment: 112 pages, 7 figures; v2: typos corrected, discussion of
supersymmetric models added at the end of section 8.1, reference adde
|
The semi-classical expansion and resurgence in gauge theories: new
perturbative, instanton, bion, and renormalon effects
|
the semi-classical expansion and resurgence in gauge theories: new perturbative, instanton, bion, and renormalon effects
|
adjoint fermions perturbation perturbatively circle compactification fermions. phenomena. orders perturbation higgsed holonomy circle abelian nonabelian factors. perturbatively monopole instantons fermion monopole monopole bions. bions carry induce fluctuations. neutral bions magnetically neutral generalization instanton mechanics bogomolny zinn justin prescription compactified theory. prescription bion bion topological predicts singularity borel i.e. divergence summing orders peturbation closer bpst instanton instanton singularity group. bion bion singularity qualitatively renormalon singularity conjecture continuously compactification changed. transseries ecalle resurgence argue perturbative continuum admit expansions pages typos corrected supersymmetric adde
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non_dup
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[] |
5254012
|
10.1007/JHEP08(2012)068
|
We discuss the chiral phase diagram in the parameter space of lattice QCD
with minimal-doubling fermions, which can be seen as lattice fermions with
flavored chemical potential terms. We study strong-coupling lattice QCD with
the Karsten-Wilczek formulation, which has one relevant parameter $\mu_{3}$ as
well as gauge coupling and a mass parameter. We find a nontrivial chiral phase
structure with a second-order phase transition between chiral symmetric and
broken phases. To capture the whole structure of the phase diagram, we study
the related lattice Gross-Neveu model. The result indicates that the chiral
phase transition also exists in the weak-coupling region. From these results we
speculate on the $\mu_{3}$-$g^{2}$ chiral phase diagram in lattice QCD with
minimal-doubling fermions, and discuss their application to numerical
simulations.Comment: 34 pages, 9 figures; extended discussion on Lorentz symmetry for
general values of parameters, two figures added, references added, version to
appear in JHE
|
Phase structure for lattice fermions with flavored chemical potential
terms
|
phase structure for lattice fermions with flavored chemical potential terms
|
chiral doubling fermions fermions flavored terms. karsten wilczek formulation parameter. nontrivial chiral chiral broken phases. capture gross neveu model. chiral region. speculate chiral doubling fermions pages lorentz
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non_dup
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[] |
5252989
|
10.1007/JHEP08(2012)069
|
We provide a simple non-perturbative formulation for non-commutative
four-dimensional N = 2 supersymmetric Yang-Mills theories. The formulation is
constructed by a combination of deconstruction (orbifold projection), momentum
cut-off and matrix model techniques. We also propose a moduli fixing term that
preserves lattice supersymmetry on the deconstruction formulation. Although the
analogous formulation for four-dimensional N = 2 supersymmetric Yang-Mills
theories is proposed also in Nucl.Phys.B857(2012), our action is simpler and
better suited for computer simulations. Moreover, not only for the
non-commutative theories, our formulation has a potential to be a
non-perturbative tool also for the commutative four-dimensional N = 2
supersymmetric Yang-Mills theories.Comment: 32 pages, final version accepted in JHE
|
An anisotropic hybrid non-perturbative formulation for 4D N = 2
supersymmetric Yang-Mills theories
|
an anisotropic hybrid non-perturbative formulation for 4d n = 2 supersymmetric yang-mills theories
|
perturbative formulation commutative supersymmetric mills theories. formulation deconstruction orbifold projection techniques. propose moduli fixing preserves supersymmetry deconstruction formulation. analogous formulation supersymmetric mills nucl.phys.b simpler suited simulations. commutative formulation perturbative commutative supersymmetric mills pages
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non_dup
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[] |
71024450
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10.1007/JHEP08(2012)071
|
We study theoretically the effects of finite volume for pipi scattering in order to extract physical observables for infinite volume from lattice QCD. We compare three different approaches for pipi scattering (lowest order Bethe-Salpeter approach, N/D and inverse amplitude methods) with the aim to study the effects of the finite size of the box in the potential of the different theories, specially the left-hand cut contribution through loops in the crossed t,u-channels. We quantify the error made by neglecting these effects in usual extractions of physical observables from lattice QCD spectra. We conclude that for pipi phase-shifts in the scalar-isoscalar channel up to 800 MeV this effect is negligible for box sizes bigger than 2.5m_pi^-1 and of the order of 5% at around 1.5-2m_pi^-1. For isospin 2 the finite size effects can reach up to 10% for that energy. We also quantify the error made when using the standard Luscher method to extract physical observables from lattice QCD, which is widely used in the literature but is an approximation of the one used in the present work
|
Finite volume treatment of pi pi scattering and limits to phase shifts extraction from lattice QCD
|
finite volume treatment of pi pi scattering and limits to phase shifts extraction from lattice qcd
|
theoretically pipi extract observables infinite qcd. pipi bethe salpeter specially loops crossed channels. quantify neglecting usual extractions observables spectra. pipi shifts isoscalar negligible sizes bigger isospin energy. quantify luscher extract observables widely
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non_dup
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[] |
5238671
|
10.1007/JHEP08(2012)072
|
Motivated by recent work on the utility of Mellin space for representing
conformal correlators in $AdS$/CFT, we study its suitability for representing
dual conformal integrals of the type which appear in perturbative scattering
amplitudes in super-Yang-Mills theory. We discuss Feynman-like rules for
writing Mellin amplitudes for a large class of integrals in any dimension, and
find explicit representations for several familiar toy integrals. However we
show that the power of Mellin space is that it provides simple representations
even for fully massive integrals, which except for the single case of the
4-mass box have not yet been computed by any available technology. Mellin space
is also useful for exhibiting differential relations between various multi-loop
integrals, and we show that certain higher-loop integrals may be written as
integral operators acting on the fully massive scalar $n$-gon in $n$
dimensions, whose Mellin amplitude is exactly 1. Our chief example is a very
simple formula expressing the 6-mass double box as a single integral of the
6-mass scalar hexagon in 6 dimensions.Comment: 29+7 page
|
Mellin Amplitudes for Dual Conformal Integrals
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mellin amplitudes for dual conformal integrals
|
motivated utility mellin representing conformal correlators suitability representing conformal integrals perturbative amplitudes super mills theory. feynman writing mellin amplitudes integrals representations familiar integrals. mellin representations massive integrals technology. mellin exhibiting integrals integrals acting massive mellin chief expressing hexagon
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non_dup
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[] |
5234492
|
10.1007/JHEP08(2012)073
|
We show that the anomalously large top quark forward-backward asymmetry
observed by CDF and D\O\, can naturally be accommodated in models with
flavor-violating couplings of a new massive spin-2 state to quarks. Regardless
of its origin, the lowest-order couplings of a spin-2 boson to fermions are
analogous to the coupling of the graviton to energy/momentum, leading to strong
sensitivity of the effects associated with its virtual exchange to the energy
scales at hand. Precisely due to this fact, the observed dependence of the
asymmetry on the $t\bar t$ invariant mass fits nicely into the proposed
framework. In particular, we find a vast parameter space which can lead to the
central value for the observed forward-backward asymmetry in the high mass bin,
while being in accord with all of the existing experimental constraints.Comment: added discussion of differential observables at the LHC, matches
version accepted for publication in JHE
|
Massive Spin-2 States as the Origin of the Top Quark Forward-Backward
Asymmetry
|
massive spin-2 states as the origin of the top quark forward-backward asymmetry
|
anomalously backward asymmetry naturally accommodated flavor violating couplings massive quarks. regardless couplings boson fermions analogous graviton virtual hand. precisely asymmetry fits nicely framework. vast backward asymmetry accord observables matches publication
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non_dup
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5234415
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10.1007/JHEP08(2012)077
|
We consider SU(2) Yang-Mills theory on $AdS_4$ by imposing various boundary
conditions, which correspond to non-trivial deformations of its boundary $CFT$.
We obtain classical solutions of Yang-Mills fields up to the first subleading
order correction by using small amplitude expansion of the gauge field without
considering gravitational back reaction. We also consider SU(2) Yang-Mills
instanton solution in $AdS_4$ bulk, and propose a boundary action. It turns out
that the boundary theory is the Chern Simons theory with a non-local
deformation which has the form similar to the Wilson line. In the limit of the
deformation parameter $\rho \rightarrow \infty$, this non-local deformation is
suppressed and the boundary theory becomes pure Chern Simons. For large but
finite values of $\rho$, this non-local deformation can be treated
perturbatively within the Chern-Simon theory.Comment: 1+30 pages, a new section about SU(2) Yang-Mills version of
electric-magnetic duality and the related references are added; Journal of
High Energy Physics, Volume 2012, Issue
|
Boundary conditions for SU(2) Yang-Mills on $AdS_4$
|
boundary conditions for su(2) yang-mills on $ads_4$
|
mills imposing trivial deformations mills subleading gravitational reaction. mills instanton propose action. turns chern simons deformation wilson line. deformation rightarrow infty deformation suppressed chern simons. deformation perturbatively chern simon pages mills duality
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non_dup
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[] |
6206811
|
10.1007/JHEP08(2012)078
|
With the latest LHC available results, we consider the generic constraints on
massive graviton. Both dijet and dilepton resonance searches are used. The
limits on parameter space can be applied to many models. As an illustration, we
show the constraints for Randall-Sundrum (RS) model. Implications on massive
graviton and the coupling strength are discussed. For $k/M_{pl}=0.1$, $M_G<2.2$
TeV region is excluded at 95% confidence level. We also present some
interesting implications on the RS radion with respect to the 125 GeV excess at
the LHC. For $k/M_{pl}=0.1$, $\Lambda_\phi<13.8$ TeV is excluded where
$\Lambda_\phi$ is the scale to charactarize the interaction strengh of radion.Comment: 17 pages, 10 figures; References added; Accepted version by JHE
|
Implications of LHC Searches for Massive Graviton
|
implications of lhc searches for massive graviton
|
latest generic massive graviton. dijet dilepton searches used. models. illustration randall sundrum model. massive graviton discussed. excluded confidence level. radion excess lhc. lambda excluded lambda charactarize strengh pages
|
non_dup
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[] |
2256754
|
10.1007/JHEP08(2012)085
|
We carry out a three-loop computation that establishes the existence of scale
without conformal invariance in dimensional regularization with the MS scheme
in d=4-epsilon spacetime dimensions. We also comment on the effects of scheme
changes in theories with many couplings, as well as in theories that live on
non-conformal scale-invariant renormalization group trajectories. Stability
properties of such trajectories are analyzed, revealing both attractive and
repulsive directions in a specific example. We explain how our results are in
accord with those of Jack & Osborn on a c-theorem in d=4 (and d=4-epsilon)
dimensions. Finally, we point out that limit cycles with turning points are
unlike limit cycles with continuous scale invariance.Comment: 21 pages, 3 figures, Erratum adde
|
Scale without Conformal Invariance at Three Loops
|
scale without conformal invariance at three loops
|
carry establishes conformal invariance regularization epsilon spacetime dimensions. comment couplings live conformal renormalization trajectories. trajectories revealing attractive repulsive directions example. accord jack osborn epsilon dimensions. cycles turning unlike cycles pages erratum adde
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non_dup
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5254091
|
10.1007/JHEP08(2012)093
|
We study the electromagnetic coupling of massless higher-spin fermions in
flat space. Under the assumptions of locality and Poincare invariance, we
employ the BRST-BV cohomological methods to construct consistent
parity-preserving off-shell cubic 1-s-s vertices. Consistency and
non-triviality of the deformations not only rule out minimal coupling, but also
restrict the possible number of derivatives. Our findings are in complete
agreement with, but derived in a manner independent from, the
light-cone-formulation results of Metsaev and the string-theory-inspired
results of Sagnotti-Taronna. We prove that any gauge-algebra-preserving vertex
cannot deform the gauge transformations. We also show that in a local theory,
without additional dynamical higher-spin gauge fields, the non-abelian vertices
are eliminated by the lack of consistent second-order deformations.Comment: 44 pages; references added, minor changes made, to appear in JHE
|
Higher-Spin Fermionic Gauge Fields and Their Electromagnetic Coupling
|
higher-spin fermionic gauge fields and their electromagnetic coupling
|
electromagnetic massless fermions space. assumptions locality poincare invariance employ brst cohomological parity preserving cubic vertices. consistency triviality deformations restrict derivatives. manner cone formulation metsaev inspired sagnotti taronna. preserving deform transformations. abelian eliminated pages minor
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non_dup
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[] |
5236851
|
10.1007/JHEP08(2012)094
|
We study the quantization of the M-theory G-flux on elliptically fibered
Calabi-Yau fourfolds with singularities giving rise to unitary and symplectic
gauge groups. We seek and find its relation to the Freed-Witten quantization of
worldvolume fluxes on 7-branes in type IIB orientifold compactifications on
Calabi-Yau threefolds. By explicitly constructing the appropriate four-cycles
on which to calculate the periods of the second Chern class of the fourfolds,
we find that there is a half-integral shift in the quantization of G-flux
whenever the corresponding dual 7-brane is wrapped on a non-spin submanifold.
This correspondence of quantizations holds for all unitary and symplectic gauge
groups, except for SU(3), which behaves mysteriously. We also perform our
analysis in the case where, in addition to the aforementioned gauge groups,
there is also a 'flavor' U(1)-gauge group.Comment: 33 pages, 4 figure
|
On Flux Quantization in F-Theory II: Unitary and Symplectic Gauge Groups
|
on flux quantization in f-theory ii: unitary and symplectic gauge groups
|
quantization elliptically fibered calabi fourfolds singularities giving unitary symplectic groups. seek freed witten quantization worldvolume fluxes branes orientifold compactifications calabi threefolds. explicitly constructing cycles chern fourfolds quantization whenever brane wrapped submanifold. correspondence quantizations unitary symplectic behaves mysteriously. aforementioned flavor pages
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non_dup
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5252027
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10.1007/JHEP08(2012)096
|
We present details of a lattice study of infrared behaviour in SU(3) gauge
theory with twelve massless fermions in the fundamental representation. Using
the step-scaling method, we compute the coupling constant in this theory over a
large range of scale. The renormalisation scheme in this work is defined by the
ratio of Polyakov loops in the directions with different boundary conditions.
We closely examine systematic effects, and find that they are dominated by
errors arising from the continuum extrapolation. Our investigation suggests
that SU(3) gauge theory with twelve flavours contains an infrared fixed point.Comment: 29 pages, 15 figures, 4 tables. Minor revision. Published versio
|
Lattice study of infrared behaviour in SU(3) gauge theory with twelve
massless flavours
|
lattice study of infrared behaviour in su(3) gauge theory with twelve massless flavours
|
infrared twelve massless fermions representation. scale. renormalisation polyakov loops directions conditions. closely examine dominated arising continuum extrapolation. twelve flavours infrared pages tables. minor revision. versio
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non_dup
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[] |
5252448
|
10.1007/JHEP08(2012)098
|
We present the first complete next-to-next-to-leading order analysis of the
Standard Model Higgs potential. We computed the two-loop QCD and Yukawa
corrections to the relation between the Higgs quartic coupling (lambda) and the
Higgs mass (Mh), reducing the theoretical uncertainty in the determination of
the critical value of Mh for vacuum stability to 1 GeV. While lambda at the
Planck scale is remarkably close to zero, absolute stability of the Higgs
potential is excluded at 98% C.L. for Mh < 126 GeV. Possible consequences of
the near vanishing of lambda at the Planck scale, including speculations about
the role of the Higgs field during inflation, are discussed.Comment: 35 pages, 8 figures. Final published version, misprints fixed,
figures update
|
Higgs mass and vacuum stability in the Standard Model at NNLO
|
higgs mass and vacuum stability in the standard model at nnlo
|
potential. yukawa quartic lambda reducing gev. lambda planck remarkably excluded c.l. gev. consequences vanishing lambda planck speculations inflation pages figures. misprints update
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non_dup
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[] |
5252159
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10.1007/JHEP08(2012)099
|
We examine compactifications of heterotic string theory on manifolds with
SU(3) structure. In particular, we study N = 1/2 domain wall solutions which
correspond to the perturbative vacua of the 4D, N =1 supersymmetric theories
associated to these compactifications. We extend work which has appeared
previously in the literature in two important regards. Firstly, we include two
additional fluxes which have been, heretofore, omitted in the general analysis
of this situation. This allows for solutions with more general torsion classes
than have previously been found. Secondly, we provide explicit solutions for
the fluxes as a function of the torsion classes. These solutions are
particularly useful in deciding whether equations such as the Bianchi
identities can be solved, in addition to the Killing spinor equations
themselves. Our work can be used to straightforwardly decide whether any given
SU(3) structure on a six-dimensional manifold is associated with a solution to
heterotic string theory. To illustrate how to use these results, we discuss a
number of examples taken from the literature.Comment: 34 pages, minor corrections in second versio
|
Heterotic domain wall solutions and SU(3) structure manifolds
|
heterotic domain wall solutions and su(3) structure manifolds
|
examine compactifications heterotic manifolds structure. perturbative vacua supersymmetric compactifications. extend appeared regards. firstly fluxes heretofore omitted situation. torsion found. secondly fluxes torsion classes. deciding bianchi identities solved killing spinor themselves. straightforwardly decide manifold heterotic theory. illustrate pages minor versio
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non_dup
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2255693
|
10.1007/JHEP08(2012)100
|
We calculate the drag force experienced by an infinitely massive quark
propagating at constant velocity through an anisotropic, strongly coupled N=4
plasma by means of its gravity dual. We find that the gluon cloud trailing
behind the quark is generally misaligned with the quark velocity, and that the
latter is also misaligned with the force. The drag coefficient $\mu$ can be
larger or smaller than the corresponding isotropic value depending on the
velocity and the direction of motion. In the ultra-relativistic limit we find
that generically $\mu \propto p$. We discuss the conditions under which this
behaviour may extend to more general situations.Comment: 25 pages, 13 figures; v2: minor changes, added reference
|
Drag force in a strongly coupled anisotropic plasma
|
drag force in a strongly coupled anisotropic plasma
|
drag experienced infinitely massive propagating anisotropic dual. gluon trailing behind misaligned misaligned force. drag isotropic motion. ultra relativistic generically propto extend pages minor
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non_dup
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[] |
5235769
|
10.1007/JHEP08(2012)105
|
Pohlmeyer reduction has been instrumental both in the program for computing
gluon scattering amplitudes at strong coupling, and more recently in the
progress towards semiclassical three-point correlators of heavy operators in
AdS/CFT. After a detailed review of the method, we combine it with Darboux and
Crum transformations in order to obtain a class of string solutions
corresponding to an arbitrary number of kinks and breathers of the elliptic
sinh-Gordon equation. We also use our construction in order to identify the
previously found dressed giant gluon with the single breather solution.Comment: 29 pages. v2: references and clarifications added; to appear in JHE
|
Pohlmeyer reduction and Darboux transformations in Euclidean worldsheet
AdS_3
|
pohlmeyer reduction and darboux transformations in euclidean worldsheet ads_3
|
pohlmeyer instrumental gluon amplitudes progress semiclassical correlators cft. combine darboux crum transformations kinks breathers elliptic sinh gordon equation. dressed giant gluon breather pages. clarifications
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non_dup
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[] |
5255429
|
10.1007/JHEP08(2012)107
|
We study a new duality which pairs 4d N=1 supersymmetric quiver gauge
theories. They are represented by brane tilings and are worldvolume theories of
D3 branes at Calabi-Yau 3-fold singularities. The new duality identifies
theories which have the same combined mesonic and baryonic moduli space,
otherwise called the master space. We obtain the associated Hilbert series
which encodes both the generators and defining relations of the moduli space.
We illustrate our findings with a set of brane tilings that have reflexive
toric diagrams.Comment: 42 pages, 16 figures, 5 table
|
Brane Tilings and Specular Duality
|
brane tilings and specular duality
|
duality supersymmetric quiver theories. brane tilings worldvolume branes calabi singularities. duality identifies mesonic baryonic moduli master space. hilbert encodes generators defining moduli space. illustrate brane tilings reflexive toric pages
|
non_dup
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[] |
5256778
|
10.1007/JHEP08(2012)109
|
In this work we discuss charged rotating black holes in $AdS_5 \times S^5$
that degenerate to extremal black holes with zero entropy. These black holes
have scaling properties between charge and angular momentum similar to those of
Fermi surface operators in a subsector of $\mathcal{N}=4$ SYM. We add a
massless uncharged scalar to the five dimensional supergravity theory, such
that it still forms a consistent truncation of the type IIB ten dimensional
supergravity and analyze its quasinormal modes. Separating the equation of
motion to a radial and angular part, we proceed to solve the radial equation
using the asymptotic matching expansion method applied to a Heun equation with
two nearby singularities. We use the continued fraction method for the angular
Heun equation and obtain numerical results for the quasinormal modes. In the
case of the supersymmetric black hole we present some analytic results for the
decay rates of the scalar perturbations. The spectrum of quasinormal modes
obtained is similar to that of a chiral 1+1 CFT, which is consistent with the
conjectured field-theoretic dual. In addition, some of the modes can be found
analytically.Comment: 41 pages, 1 figure, LaTeX; v2: typos corrected, references adde
|
Degenerate Rotating Black Holes, Chiral CFTs and Fermi Surfaces I -
Analytic Results for Quasinormal Modes
|
degenerate rotating black holes, chiral cfts and fermi surfaces i - analytic results for quasinormal modes
|
rotating holes degenerate extremal holes entropy. holes fermi subsector mathcal sym. massless uncharged supergravity truncation supergravity analyze quasinormal modes. separating proceed solve asymptotic matching heun nearby singularities. continued heun quasinormal modes. supersymmetric analytic perturbations. quasinormal chiral conjectured theoretic dual. pages latex typos corrected adde
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non_dup
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5257096
|
10.1007/JHEP08(2012)111
|
We propose a framework for natural breaking of electroweak symmetry in
supersymmetric models, where elementary Higgs fields are semi-perturbatively
coupled to a strong superconformal sector. The Higgs VEVs break conformal
symmetry in the strong sector at the TeV scale, and the strong sector in turn
gives important contributions to the Higgs potential, giving rise to a kind of
Higgs bootstrap. A Higgs with mass $125\GeV$ can be accommodated without any
fine tuning. A Higgsino mass of order the Higgs mass is also dynamically
generated in these models. The masses in the strong sector generically violate
custodial symmetry, and a good precision electroweak fit requires tuning of
order $\sim 10%$. The strong sector has an approximately supersymmetric
spectrum of hadrons at the TeV scale that can be observed by looking for a peak
in the $WZ$ invariant mass distribution, as well as final states containing
multiple $W$, $Z$, and Higgs bosons. The models also generically predict large
corrections (either enhancement or suppression) to the $h \to \ga\ga$ width.Comment: 31 page
|
Partially Composite Higgs in Supersymmetry
|
partially composite higgs in supersymmetry
|
propose breaking electroweak supersymmetric elementary perturbatively superconformal sector. vevs break conformal giving kind bootstrap. accommodated fine tuning. higgsino dynamically models. generically violate custodial precision electroweak tuning supersymmetric hadrons looking bosons. generically predict enhancement suppression
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non_dup
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[] |
5254384
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10.1007/JHEP08(2012)112
|
In type IIB string compactifications on a Calabi-Yau threefold, the
hypermultiplet moduli space $M_H$ must carry an isometric action of the modular
group SL(2,Z), inherited from the S-duality symmetry of type IIB string theory
in ten dimensions. We investigate how this modular symmetry is realized at the
level of the twistor space of $M_H$, and construct a general class of
SL(2,Z)-invariant quaternion-Kahler metrics with two commuting isometries,
parametrized by a suitably covariant family of holomorphic transition
functions. This family should include $M_H$ corrected by D3-D1-D(-1)-instantons
(with fivebrane corrections ignored) and, after taking a suitable rigid limit,
the Coulomb branch of five-dimensional N=2 gauge theories compactified on a
torus, including monopole string instantons. These results allow us to
considerably simplify the derivation of the mirror map between type IIA and IIB
fields in the sector where only D1-D(-1)-instantons are retained.Comment: 29 pages, 1 figur
|
S-duality in Twistor Space
|
s-duality in twistor space
|
compactifications calabi threefold hypermultiplet moduli carry isometric modular inherited duality dimensions. modular realized twistor quaternion kahler metrics commuting isometries parametrized suitably covariant holomorphic functions. corrected instantons fivebrane ignored rigid coulomb branch compactified torus monopole instantons. considerably simplify derivation mirror instantons pages figur
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non_dup
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[] |
5254581
|
10.1007/JHEP08(2012)113
|
The constraints imposed on hydrodynamics by the structure of gauge and
gravitational anomalies are studied in two dimensions. By explicit integration
of the consistent gravitational anomaly, we derive the equilibrium partition
function at second derivative order. This partition function is then used to
compute the parity-violating part of the covariant energy-momentum tensor and
the transport coefficients.Comment: 9 pages, JHEP format.v2; added comments and references, matching
published versio
|
Hydrodynamics in 1+1 dimensions with gravitational anomalies
|
hydrodynamics in 1+1 dimensions with gravitational anomalies
|
imposed hydrodynamics gravitational anomalies dimensions. gravitational anomaly derive partition order. partition parity violating covariant pages jhep format.v comments matching versio
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non_dup
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[] |
33994406
|
10.1007/JHEP08(2012)114
|
Copious production of top-anti top quark pairs at hadron colliders has enabled various probes into the properties and interactions of top quarks. Among the various presently measured observables, the forward-backward asymmetry (FBA) in t (t) over bar production measured at the Tevatron significantly deviates from the standard model predictions, and many models of new physics have been invented to explain the puzzle. We consider the consistency of the simplified single-resonance models containing a color octet axial-vector ("axigluon"), color triplet or sextet weak singlet scalars, weak isodoublet scalar, flavor-changing neutral Z', or charged W' vector boson with existing t (t) over bar production measurements. Among the considered models only an axigluon can reproduce all Tevatron observables, without being in severe tension with the recent LHC results on t (t) over bar production cross section, charge asymmetry and top-spin correlations. The LHC charge asymmetry measurements exclude the W' and Z' explanations of the Tevatron FBA anomaly. On the other hand, all scalar models predict notable deviations in several top spin observables, and the recent top spin correlation measurement using the "helicity" spin quantization axis by ATLAS already provides a significant constraint on possible explanations of the Tevatron FBA anomaly. Future precise measurements of top spin correlations and especially top polarization could differentiate between scalar t-channel models, while they are less sensitive to pure axigluon contributions
|
Discerning new physics in t(t)over-bar production using top spin observables at hadron colliders
|
discerning new physics in t(t)over-bar production using top spin observables at hadron colliders
|
copious hadron colliders enabled probes quarks. presently observables backward asymmetry tevatron deviates invented puzzle. consistency simplified octet axial axigluon triplet sextet singlet scalars isodoublet flavor changing neutral boson measurements. axigluon reproduce tevatron observables tension asymmetry correlations. asymmetry exclude explanations tevatron anomaly. predict notable deviations observables helicity quantization atlas explanations tevatron anomaly. precise differentiate axigluon
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non_dup
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[] |
5252938
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10.1007/JHEP08(2012)115
|
We describe the computation of the $gg \to W^+W^-g$ process that contributes
to the production of two $W$-bosons and a jet at the CERN Large Hadron Collider
(LHC). While formally of next-to-next-to-leading order (NNLO) in QCD, this
process can be evaluated separately from the bulk of NNLO QCD corrections
because it is finite and gauge-invariant. It is also enhanced by the large
gluon flux and by selection cuts employed in the Higgs boson searches in the
decay channel $ H \to W^+W^-$, as was first pointed out by Binoth {\it et al.}
in the context of $gg \to W^+W^-$ production. For cuts employed by the ATLAS
collaboration, we find that the gluon fusion contribution to $pp \to W^+W^-j$
enhances the background by about ten percent and can lead to moderate
distortions of kinematic distributions which are instrumental for the ongoing
Higgs boson searches at the LHC. We also release a public code to compute the
NLO QCD corrections to this process, in the form of an add-on to the package
{\tt MCFM}.Comment: 13 pages, 4 figures, 3 table
|
Gluon fusion contribution to W+W- + jet production
|
gluon fusion contribution to w+w- + jet production
|
contributes bosons cern hadron collider formally nnlo separately nnlo invariant. gluon cuts boson searches pointed binoth production. cuts atlas gluon fusion enhances percent moderate distortions kinematic instrumental ongoing boson searches lhc. package mcfm .comment pages
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non_dup
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[] |
5230895
|
10.1007/JHEP08(2012)118
|
We discuss phases of gauge theories in the holographic context, and formulate
a criterion for the existence of a Higgs phase, where the gauge redundancy is
"spontaneously broken", in purely bulk language. This condition, the existence
of a finite tension solitonic string representing a narrow magnetic flux tube,
is necessary for a bulk theory to be interpreted as a Higgs phase of a boundary
gauge theory. We demonstrate the existence of such solitons in both top-down
and bottom-up examples of holographic theories. In particular, we numerically
construct new solitonic solutions in AdS black hole background, for various
values of the boundary gauge coupling, which are used to demonstrate that the
bulk theory models a superconductor, rather than a superfluid. The criterion we
find is expected to be useful in finding holographic duals of color
superconducting phases of gauge theories at finite density.Comment: Corrected typo
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Holographic Higgs Phases
|
holographic higgs phases
|
holographic formulate criterion redundancy spontaneously broken purely language. tension solitonic representing narrow tube interpreted theory. solitons holographic theories. numerically solitonic superconductor superfluid. criterion holographic duals superconducting corrected typo
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non_dup
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[] |
2255135
|
10.1007/JHEP08(2012)119
|
We provide a detailed correspondence between G_4 gauge fluxes in F-theory
compactifications with SU(n) and SU(n)x(1) gauge symmetry and their Type IIB
orientifold limit. Based on the resolution of the relevant F-theory Tate models
we classify the factorisable G_4-fluxes and match them with the set of
universal D5-tadpole free U(1)-fluxes in Type IIB. Where available, the global
version of the universal spectral cover flux corresponds to Type IIB gauge flux
associated with a massive diagonal U(1). In U(1)-restricted Tate models extra
massless abelian fluxes exist which are associated with specific linear
combinations of Type IIB fluxes. Key to a quantitative match between F-theory
and Type IIB is a proper treatment of the conifold singularity encountered in
the Sen limit of generic F-theory models. We also shed further light on the
brane recombination process relating generic and U(1)-restricted Tate models.Comment: 53 pages, 3 figures; v2: Refs added; v3: minor corrections to match
version published in JHE
|
Gauge Fluxes in F-theory and Type IIB Orientifolds
|
gauge fluxes in f-theory and type iib orientifolds
|
correspondence fluxes compactifications orientifold limit. tate classify factorisable fluxes match universal tadpole fluxes iib. universal cover massive diagonal restricted tate extra massless abelian fluxes combinations fluxes. match proper conifold singularity encountered generic models. shed brane recombination relating generic restricted tate pages refs minor match
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non_dup
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[] |
5255898
|
10.1007/JHEP08(2012)120
|
A higher grading affine algebraic construction of integrable hierarchies,
containing the Wadati-Konno-Ichikawa (WKI) hierarchy as a particular case, is
proposed. We show that a two-component generalization of the Sch\" afer-Wayne
short pulse equation arises quite naturally from the first negative flow of the
WKI hierarchy. Some novel integrable nonautonomous models are also proposed.
The conserved charges, both local and nonlocal, are obtained from the Riccati
form of the spectral problem. The loop-soliton solutions of the WKI hierarchy
are systematically constructed through gauge followed by reciprocal B\" acklund
transformation, establishing the precise connection between the whole WKI and
AKNS hierarchies. The connection between the short pulse equation with the
sine-Gordon model is extended to a correspondence between the two-component
short pulse equation and the Lund-Regge model
|
The higher grading structure of the WKI hierarchy and the two-component
short pulse equation
|
the higher grading structure of the wki hierarchy and the two-component short pulse equation
|
grading affine algebraic integrable hierarchies wadati konno ichikawa hierarchy proposed. generalization afer wayne arises naturally hierarchy. integrable nonautonomous proposed. conserved charges nonlocal riccati problem. soliton hierarchy systematically reciprocal acklund establishing precise connection akns hierarchies. connection sine gordon correspondence lund regge
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non_dup
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[] |
5253316
|
10.1007/JHEP08(2012)121
|
We derive constraints on Wilson coefficients of dimension-six effective
operators probing the b --> s transition, using recent improved measurements of
the rare decays Bs --> mu+mu-, B --> K mu+mu- and B --> K* mu+mu- and including
all relevant observables in inclusive and exclusive decays. We consider
operators present in the SM as well as their chirality-flipped counterparts and
scalar operators. We find good agreement with the SM expectations. Compared to
the situation before winter 2012, we find significantly more stringent
constraints on the chirality-flipped coefficients due to complementary
constraints from B --> K mu+mu- and B --> K* mu+mu- and due to the LHCb
measurement of the angular observable S_3 in the latter decay. We also list the
full set of observables sensitive to new physics in the low recoil region of B
--> K* mu+mu-.Comment: 18 pages, 6 figures, 4 tables. v3: typos correcte
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Cornering New Physics in b --> s Transitions
|
cornering new physics in b --> s transitions
|
derive wilson probing rare decays observables inclusive exclusive decays. chirality flipped counterparts operators. expectations. winter stringent chirality flipped complementary lhcb observable decay. observables recoil .comment pages tables. typos correcte
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non_dup
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[] |
5254301
|
10.1007/JHEP08(2012)122
|
We compute the boundary terms and junction conditions for Horndeski's
panoptic class of scalar-tensor theories, and write the bulk and boundary
equations of motion in explicitly second order form. We consider a number of
special subclasses, including galileon theories, and present the corresponding
formulae. Our analysis opens up of the possibility of studying tunnelling
between vacua in generalized scalar-tensor theories, and braneworld dynamics.
The latter follows because our results are independent of spacetime dimension.Comment: 13 pages, Equation corrected. Thanks to Tsutomu Kobayashi for
informing us of the typ
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Boundary Terms and Junction Conditions for Generalized Scalar-Tensor
Theories
|
boundary terms and junction conditions for generalized scalar-tensor theories
|
junction horndeski panoptic explicitly form. subclasses galileon formulae. opens studying tunnelling vacua braneworld dynamics. spacetime pages corrected. thanks tsutomu kobayashi informing
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non_dup
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[] |
6207668
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10.1007/JHEP08(2012)123
|
Using lattice simulations, we measure the sphaleron rate in the Standard
Model as a function of temperature through the electroweak cross-over, for the
Higgs masses m_H=115 and m_H=160 GeV. We pay special attention to the shutting
off of the baryon rate as the temperature is lowered. This quantity enters
computations of Baryogenesis via Leptogenesis, where non-zero lepton number is
converted into non-zero baryon number by equilibrium sphaleron transitions.
Combining existing numerical methods applicable in the symmetric and broken
electroweak phases, we find the temperature dependence of the sphaleron rate at
very high temperature, through the electroweak cross-over transition, and deep
into the broken phase.Comment: 25 pages, 11 figure
|
The Sphaleron Rate through the Electroweak Cross-over
|
the sphaleron rate through the electroweak cross-over
|
sphaleron electroweak gev. shutting baryon lowered. quantity enters computations baryogenesis leptogenesis lepton converted baryon sphaleron transitions. combining applicable broken electroweak sphaleron electroweak broken pages
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non_dup
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[] |
144260553
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10.1007/JHEP08(2012)125
|
We perform a detailed analysis of lepton flavour violation (LFV) within minimal see-saw type extensions of the Standard Model (SM), which give a viable mechanism of neutrino mass generation and provide new particle content at the electroweak scale. We focus, mainly, on predictions and constraints set on each scenario from p → e 7, p → 3e and p - e conversion in the nuclei. In this class of models, the flavour structure of the Yukawa couplings between the additional scalar and fermion representations and the SM leptons is highly constrained by neutrino oscillation measurements. In particular, we show that in some regions of the parameters space of type I and type II see-saw models, the Dirac and Majorana phases of the neutrino mixing matrix, the ordering and hierarchy of the active neutrino mass spectrum as well as the value of the reactor mixing angle θ 13 may considerably affect the size of the LFV observables. The interplay of the latter clearly allows to discriminate among the different low energy see-saw possibilities. © 2012 SISSA
|
The μ - e conversion in nuclei, μ → eγ, μ → 3e decays and TeV scale see-saw scenarios of neutrino mass generation
|
the μ - e conversion in nuclei, μ → eγ, μ → 3e decays and tev scale see-saw scenarios of neutrino mass generation
|
lepton flavour violation extensions viable electroweak scale. conversion nuclei. flavour yukawa couplings fermion representations leptons constrained oscillation measurements. dirac majorana ordering hierarchy reactor considerably observables. interplay discriminate possibilities. sissa
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non_dup
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60620856
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10.1007/JHEP08(2012)130
|
Journal of High Energy Physics 2012.8 (2012): 130 reproduced by permission of Scuola Internazionale Superiore di Studi Avanzati (SISSA)Artículo escrito por un elevado número de autores, solo se referencian el que aparece en primer lugar, el nombre del grupo de colaboración, si le hubiere, y los autores pertenecientes a la UAMThe first measurement of the charged component of the underlying event using the novel "jet-area/median" approach is presented for proton-proton collisions at centre-of-mass energies of 0.9 and 7 TeV. The data were recorded in 2010 with the CMS experiment at the LHC. A new observable, sensitive to soft particle production, is introduced and investigated inclusively and as a function of the event scale defined by the transverse momentum of the leading jet. Various phenomenological models are compared to data, with and without corrections for detector effects. None of the examined models describe the data satisfactoril
|
Measurement of the underlying event activity in pp collisions at √s = 0.9 and 7 TeV with the novel jet-area/median approach
|
measurement of the underlying event activity in pp collisions at √s = 0.9 and 7 tev with the novel jet-area/median approach
|
reproduced permission scuola internazionale superiore studi avanzati sissa artículo escrito elevado número autores solo referencian aparece primer lugar nombre grupo colaboración hubiere autores pertenecientes uamthe proton proton collisions tev. lhc. observable inclusively jet. phenomenological effects. none satisfactoril
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non_dup
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5258959
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10.1007/JHEP08(2012)131
|
We discuss the gravity duals of 4d N=2 superconformal field theories (SCFTs)
arising from the low-energy limit of brane configurations of D4-branes
stretched between and intersecting NS5-branes and D6-branes. This gives rise to
a product of SU(N_i) groups, with bi-fundamental matter between adjacent
groups, and extra fundamental hypermultiplets. The most general configuration
in 11d (or type IIA) supergravity that is dual to a 4d N=2 SCFT (when the dual
of this SCFT is a weakly curved background) was written down by Gaiotto and
Maldacena, but finding it explicitly involves solving a complicated Toda
equation. This equation simplifies only when the solution can be reduced to
type IIA supergravity, so we ask for which SCFTs of this type is there a type
IIA dual that is weakly coupled and weakly curved (away from NS5-branes and
D6-branes). We find that such solutions (a special case of which was analyzed
by Reid-Edwards and Stefanski) exist when there is a large number of gauge
groups, with large ranks, and with large 't Hooft couplings for all but a
finite number of groups. The general solution of this type is given by solving
an axially symmetric Laplace equation in three dimensions, with specific
boundary conditions. We match the parameters of the 4d SCFTs, including the
exactly marginal coupling constants, with the boundary conditions for the
Laplace equation.Comment: 32 pages, 7 figures. v2: added reference
|
4d N=2 superconformal linear quivers with type IIA duals
|
4d n=2 superconformal linear quivers with type iia duals
|
duals superconformal scfts arising brane configurations branes stretched intersecting branes branes. adjacent extra hypermultiplets. supergravity scft scft weakly curved gaiotto maldacena explicitly involves solving complicated toda equation. simplifies supergravity scfts weakly weakly curved away branes branes reid edwards stefanski ranks hooft couplings groups. solving axially laplace conditions. match scfts marginal laplace pages figures.
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non_dup
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5234222
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10.1007/JHEP08(2012)134
|
We derive a set of integral equations of the TBA type for the generalized
cusp anomalous dimension, or the quark antiquark potential on the three sphere,
as a function of the angles. We do this by considering a family of local
operators on a Wilson loop with charge L. In the large L limit the problem can
be solved in terms of a certain boundary reflection matrix. We determine this
reflection matrix by using the symmetries and the boundary crossing equation.
The cusp is introduced through a relative rotation between the two boundaries.
Then the TBA trick of exchanging space and time leads to an exact equation for
all values of L. The L=0 case corresponds to the cusped Wilson loop with no
operators inserted. We then derive a slightly simplified integral equation
which describes the small angle limit. We solve this equation up to three loops
in perturbation theory and match the results that were obtained with more
direct approaches.Comment: 63 pages, 12 figures. v2: references added, typos correcte
|
The quark anti-quark potential and the cusp anomalous dimension from a
TBA equation
|
the quark anti-quark potential and the cusp anomalous dimension from a tba equation
|
derive cusp anomalous antiquark sphere angles. wilson solved reflection matrix. reflection symmetries crossing equation. cusp boundaries. trick exchanging cusped wilson inserted. derive simplified describes limit. solve loops perturbation match pages figures. typos correcte
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non_dup
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[] |
5252385
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10.1007/JHEP08(2012)135
|
Weinberg sum-rules have been used in the past to successfully predict the
electromagnetic contribution to the charged-pion mass as a function of the
meson masses. Following the same approach we calculate in the minimal composite
Higgs model (MCHM) the Higgs mass as a function of the fermionic resonance
masses. The simplicity of the method allows us to study several versions of the
MCHM and show that a Higgs with a mass around 125 GeV requires, quite
generically, fermionic resonances below the TeV, and therefore accessible at
the LHC. We also examine the couplings of the Higgs to the SM fermions and
calculate their deviation from the SM value.Comment: Version to be published in JHE
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The Composite Higgs and Light Resonance Connection
|
the composite higgs and light resonance connection
|
weinberg successfully predict electromagnetic pion meson masses. composite mchm fermionic masses. simplicity versions mchm generically fermionic resonances accessible lhc. examine couplings fermions
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non_dup
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[] |
6207729
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10.1007/JHEP08(2012)136
|
We study flavour-violating processes which involve heavy B- and D-mesons and
are mediated by Kaluza-Klein modes of gauge bosons in a previously suggested
model where three generations of the Standard Model fermions originate from a
single generation in six dimensions. We find the bound on the size R of the
extra spatial dimensions 1/R>3.3 TeV, which arises from the three-body decay
B_s to K mu e. Due to the still too low statistics this bound is much less
stringent than the constraint arising from K to mu e, 1/R>64 TeV, which was
found in a previous work (Frere et al., JHEP, 2003). Nevertheless, we argue
that a clear signature of the model would be an observation of K to mu e and
B_s to K mu e decays without observations of other flavour and lepton number
changing processes at the same precision level.Comment: 15 page
|
Heavy-meson physics and flavour violation with a single generation
|
heavy-meson physics and flavour violation with a single generation
|
flavour violating involve mesons kaluza klein bosons generations fermions originate dimensions. extra arises stringent arising frere jhep nevertheless argue signature decays flavour lepton changing precision
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non_dup
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[] |
5255349
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10.1007/JHEP08(2012)138
|
We revisit the potential of a Linear Collider concerning the study of lepton
flavour violation, in view of new LHC bounds and of the (very) recent
developments in lepton physics. Working in the framework of a type I
supersymmetric seesaw, we evaluate the prospects of observing seesaw-induced
lepton flavour violating final states of the type e \mu + missing energy,
arising from e+ e- and e- e- collisions. In both cases we address the potential
background from standard model and supersymmetric charged currents. We also
explore the possibility of electron and positron beam polarisation. The
statistical significance of the signal, even in the absence of kinematical
and/or detector cuts, renders the observation of such flavour violating events
feasible over large regions of the parameter space. We further consider the
\mu-\mu- + E^T_miss final state in the e- e- beam option finding that, due to a
very suppressed background, this process turns out to be a truly clear probe of
a supersymmetric seesaw, assuming the latter to be the unique source of lepton
flavour violation.Comment: 30 pages, 48 figure
|
Lepton flavour violation: physics potential of a Linear Collider
|
lepton flavour violation: physics potential of a linear collider
|
revisit collider concerning lepton flavour violation bounds developments lepton physics. supersymmetric seesaw prospects observing seesaw lepton flavour violating missing arising collisions. supersymmetric currents. explore positron polarisation. kinematical cuts renders flavour violating feasible space. miss option suppressed turns truly supersymmetric seesaw lepton flavour pages
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non_dup
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[] |
5251836
|
10.1007/JHEP08(2012)140
|
We obtain the complete set of equations of motion for the interacting system
of supermembrane and dynamical D=4 N = 1 supergravity by varying its complete
superfield action and writing the resulting superfield equations in the special
gauge where the supermembrane Goldstone field is set to zero. We solve the
equations for auxiliary fields and discuss the effect of dynamical generation
of cosmological constant in the Einstein equation of interacting system and its
renormalization due to some regular contributions from supermembrane. These two
effects (discussed in late 70th and 80th, in the bosonic perspective and in the
supergravity literature) result in that, generically, the cosmological constant
has different values in the branches of the spacetime separated by the
supermembrane worldvolume.Comment: 23 pages, no figures. V2 two references added, 24 page
|
Supermembrane interaction with dynamical D=4 N=1 supergravity.
Superfield Lagrangian description and spacetime equations of motion
|
supermembrane interaction with dynamical d=4 n=1 supergravity. superfield lagrangian description and spacetime equations of motion
|
interacting supermembrane supergravity superfield writing superfield supermembrane goldstone zero. solve auxiliary cosmological einstein interacting renormalization supermembrane. bosonic perspective supergravity generically cosmological branches spacetime separated supermembrane pages figures.
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non_dup
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[] |
5258943
|
10.1007/JHEP08(2012)142
|
The moduli space of the supersymmetric massive IIA AdS4xS2(B4) vacua, where
S2(B4) is a two-sphere bundle over a four-dimensional Kaehler-Einstein base B4,
includes three independent parameters which can be thought of as corresponding
to the sizes of AdS4, B4 and the S2 fiber. It might therefore be expected that
these vacua do not suffer from the absence of scale separation. We show that
the independence of the geometric moduli survives flux quantization. However,
we uncover an attractor behavior whereby all sizes flow to equality in some
neighborhood of spacetime independently of the initial conditions set by the
parameters of the solution. This is further confirmed by the study of the ratio
of internal to external scalar curvatures. We also show that the asymptotic
Kaluza-Klein spectrum of a ten-dimensional massive scalar is governed by a
scale of the order of the AdS4 radius. Furthermore we point out that the
curvature ratio in supersymmetric IIA AdS4 vacua with rigid SU(3) structure is
of order one, indicating the absence of scale separation in this large class of
vacua.Comment: 21 pages, 2 figures; v2 typos correcte
|
Supersymmetric AdS vacua and separation of scales
|
supersymmetric ads vacua and separation of scales
|
moduli supersymmetric massive vacua sphere bundle kaehler einstein thought sizes fiber. vacua suffer separation. independence geometric moduli survives quantization. uncover attractor whereby sizes equality neighborhood spacetime independently solution. confirmed curvatures. asymptotic kaluza klein massive governed radius. curvature supersymmetric vacua rigid pages typos correcte
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non_dup
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5233648
|
10.1007/JHEP08(2012)147
|
We investigate the mapping of conformal correlators and of their anomalies
from configuration to momentum space for general dimensions, focusing on the
anomalous correlators $TOO$, $TVV$ - involving the energy-momentum tensor $(T)$
with a vector $(V)$ or a scalar operator ($O$) - and the 3-graviton vertex
$TTT$. We compute the $TOO$, $TVV$ and $TTT$ one-loop vertex functions in
dimensional regularization for free field theories involving conformal scalar,
fermion and vector fields. Since there are only one or two independent tensor
structures solving all the conformal Ward identities for the $TOO$ or $TVV$
vertex functions respectively, and three independent tensor structures for the
$TTT$ vertex, and the coefficients of these tensors are known for free fields,
it is possible to identify the corresponding tensors in momentum space from the
computation of the correlators for free fields. This works in general $d$
dimensions for $TOO$ and $TVV$ correlators, but only in 4 dimensions for $TTT$,
since vector fields are conformal only in $d=4$. In this way the general
solution of the Ward identities including anomalous ones for these correlators
in (Euclidean) position space, found by Osborn and Petkou is mapped to the
ordinary diagrammatic one in momentum space. We give simplified expressions of
all these correlators in configuration space which are explicitly Fourier
integrable and provide a diagrammatic interpretation of all the contact terms
arising when two or more of the points coincide. We discuss how the anomalies
arise in each approach [...]Comment: 57 pages, 7 figures. Refs adde
|
Graviton Vertices and the Mapping of Anomalous Correlators to Momentum
Space for a General Conformal Field Theory
|
graviton vertices and the mapping of anomalous correlators to momentum space for a general conformal field theory
|
conformal correlators anomalies focusing anomalous correlators involving graviton regularization involving conformal fermion fields. solving conformal ward identities tensors tensors correlators fields. correlators conformal ward identities anomalous correlators euclidean osborn petkou mapped ordinary diagrammatic space. simplified expressions correlators explicitly fourier integrable diagrammatic arising coincide. anomalies arise comment pages figures. refs adde
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non_dup
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[] |
5256857
|
10.1007/JHEP08(2012)148
|
We consider the effective stress-energy tensors for the foreground and
background sectors in ghost-free bimetric gravity. By considering the
symmetries of the theory, we show that the foreground and background null
energy conditions (NECs) are strongly anti-correlated. In particular, the NECs
can only be simultaneously fulfilled when they saturate, corresponding to
foreground and background cosmological constants. In all other situations,
either the foreground or the background is subject to a NEC-violating
contribution to the total stress-energy.Comment: v1: 16 pages; v2: 2 references adde
|
Null Energy Condition violations in bimetric gravity
|
null energy condition violations in bimetric gravity
|
tensors foreground sectors ghost bimetric gravity. symmetries foreground necs correlated. necs simultaneously fulfilled saturate foreground cosmological constants. situations foreground violating pages adde
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non_dup
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[] |
5252768
|
10.1007/JHEP08(2012)150
|
The presence of new matter fields charged under the Standard Model gauge
group at intermediate scales below the Grand Unification scale modifies the
renormalization group evolution of the gauge couplings. This can in turn
significantly change the running of the Minimal Supersymmetric Standard Model
parameters, in particular the gaugino and the scalar masses. In the absence of
new large Yukawa couplings we can parameterise all the intermediate scale
models in terms of only two parameters controlling the size of the unified
gauge coupling. As a consequence of the modified running, the low energy
spectrum can be strongly affected with interesting phenomenological
consequences. In particular, we show that scalar over gaugino mass ratios tend
to increase and the regions of the parameter space with neutralino Dark Matter
compatible with cosmological observations get drastically modified. Moreover,
we discuss some observables that can be used to test the intermediate scale
physics at the LHC in a wide class of models.Comment: 24 pages, 16 figure
|
Postcards from oases in the desert: phenomenology of SUSY with
intermediate scales
|
postcards from oases in the desert: phenomenology of susy with intermediate scales
|
grand unification modifies renormalization couplings. running supersymmetric gaugino masses. yukawa couplings parameterise controlling unified coupling. running phenomenological consequences. gaugino tend neutralino compatible cosmological drastically modified. observables pages
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non_dup
|
[] |
5251395
|
10.1007/JHEP08(2012)154
|
The process of gluon-initiated double Higgs production is sensitive to
non-linear interactions of the Higgs boson. In the context of the Standard
Model, studies of this process focused on the extraction of the Higgs trilinear
coupling. In a general parametrization of New Physics effects, however, an even
more interesting interaction that can be tested through this channel is the
(ttbar hh) coupling. This interaction vanishes in the Standard Model and is a
genuine signature of theories in which the Higgs boson emerges from a
strongly-interacting sector. In this paper we perform a model-independent
estimate of the LHC potential to detect anomalous Higgs couplings in
gluon-fusion double Higgs production. We find that while the sensitivity to the
trilinear is poor, the perspectives of measuring the new (ttbar hh) coupling
are rather promising.Comment: 22 pages, 9 figures. v2: plots of Figs.8 and 9 redone to include
experimental uncertainty on the Higgs couplings, references adde
|
Anomalous Couplings in Double Higgs Production
|
anomalous couplings in double higgs production
|
gluon initiated boson. focused extraction trilinear coupling. parametrization ttbar coupling. vanishes genuine signature boson emerges interacting sector. detect anomalous couplings gluon fusion production. trilinear perspectives measuring ttbar pages figures. plots figs. redone couplings adde
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non_dup
|
[] |
5239220
|
10.1007/JHEP08(2012)156
|
Measurements of the Higgs-boson production cross section at the LHC are an
important tool for studying electroweak symmetry breaking at the quantum level,
since the main production mechanism gg-->h is loop-suppressed in the Standard
Model (SM). Higgs production in extra-dimensional extensions of the SM is
sensitive to the Kaluza-Klein (KK) excitations of the quarks, which can be
exchanged as virtual particles in the loop. In the context of the minimal
Randall-Sundrum (RS) model with bulk fields and a brane-localized Higgs sector,
we derive closed analytical expressions for the gluon-gluon fusion process,
finding that the effect of the infinite tower of virtual KK states can be
described in terms of a simple function of the fundamental (5D) Yukawa
matrices. Given a specific RS model, this will allow one to easily constrain
the parameter space, once a Higgs signal has been established. We explain that
discrepancies between existing calculations of Higgs production in RS models
are related to the non-commutativity of two limits: taking the number of KK
states to infinity and removing the regulator on the Higgs-boson profile, which
is required in an intermediate step to make the relevant overlap integrals well
defined. Even though the one-loop gg-->h amplitude is finite in RS scenarios
with a brane-localized Higgs sector, it is important to introduce a consistent
ultraviolet regulator in order to obtain the correct result.Comment: 27 pages, 3 figures; discussion in Sections 2 and 7 improved and
extended, version accepted for publication in JHE
|
Higgs Production in a Warped Extra Dimension
|
higgs production in a warped extra dimension
|
boson studying electroweak breaking suppressed extra extensions kaluza klein excitations quarks exchanged virtual loop. randall sundrum brane localized derive expressions gluon gluon fusion infinite tower virtual yukawa matrices. constrain established. discrepancies commutativity infinity removing regulator boson overlap integrals defined. scenarios brane localized ultraviolet regulator pages publication
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non_dup
|
[] |
5251569
|
10.1007/JHEP08(2012)158
|
We describe the systematical construction of the first order formalism for
multi-centered black holes with flat three dimensional base-space, within the
so-called $T^{3}$ model of N=2, D=4 ungauged Maxwell-Einstein supergravity. The
three possible flow classes (BPS, composite non-BPS and almost-BPS) are
analyzed in detail, and various solutions, such as single-centered (static or
under-rotating) and all known multi-centered black holes, are recovered in this
unified framework. We also consider the possibility of obtaining new solutions.
The almost-BPS class is proved to split into two general sub-classes,
corresponding to a positive or negative value of the duality-invariant
polynomial for the total charge; the well known almost BPS system is shown to
be a particular solution of the second sub-class.Comment: 17 pages,no figure
|
Multi-Centered Black Hole Flows
|
multi-centered black hole flows
|
systematical formalism centered holes ungauged maxwell einstein supergravity. composite centered rotating centered holes recovered unified framework. obtaining solutions. proved split duality pages
|
non_dup
|
[] |
2186670
|
10.1007/JHEP08(2012)159
|
Gauge mediated supersymmetry breaking (GMSB) is a theoretically
well-motivated framework with rich and varied collider phenomenology. In this
paper, we study the Tevatron limits and LHC discovery potential for a wide
class of GMSB scenarios in which the next-to-lightest superpartner (NLSP) is a
promptly-decaying neutralino. These scenarios give rise to signatures involving
hard photons, $W$'s, $Z$'s, jets and/or higgses, plus missing energy. In order
to characterize these signatures, we define a small number of minimal spectra,
in the context of General Gauge Mediation, which are parameterized by the mass
of the NLSP and the gluino. Using these minimal spectra, we determine the most
promising discovery channels for general neutralino NLSPs. We find that the
2010 dataset can already cover new ground with strong production for all NLSP
types. With the upcoming 2011-2012 dataset, we find that the LHC will also have
sensitivity to direct electroweak production of neutralino NLSPs.Comment: 26 page
|
General Neutralino NLSPs at the Early LHC
|
general neutralino nlsps at the early lhc
|
supersymmetry breaking gmsb theoretically motivated varied collider phenomenology. tevatron discovery gmsb scenarios lightest superpartner nlsp promptly decaying neutralino. scenarios signatures involving photons jets higgses missing energy. characterize signatures mediation parameterized nlsp gluino. promising discovery neutralino nlsps. dataset cover nlsp types. upcoming dataset electroweak neutralino
|
non_dup
|
[] |
5239737
|
10.1007/JHEP08(2012)160
|
New particles at the TeV-scale may have sizeable decay rates into boosted
Higgs bosons or other heavy scalars. Here, we investigate the possibility of
identifying such processes when the Higgs/scalar subsequently decays into a
pair of W bosons, constituting a highly distinctive "diboson-jet." These can
appear as a simple dilepton (plus MET) configuration, as a two-prong jet with
an embedded lepton, or as a four-prong jet. We study jet substructure methods
to discriminate these objects from their dominant backgrounds. We then
demonstrate the use of these techniques in the search for a heavy spin-one Z'
boson, such as may arise from strong dynamics or an extended gauge sector,
utilizing the decay chain Z' -> Zh -> Z(WW^(*)). We find that modes with
multiple boosted hadronic Zs and Ws tend to offer the best prospects for the
highest accessible masses. For 100/fb luminosity at the 14 TeV LHC, Z' decays
into a standard 125 GeV Higgs can be observed with 5-sigma significance for
masses of 1.5-2.5 TeV for a range of models. For a 200 GeV Higgs (requiring
nonstandard couplings, such as fermiophobic), the reach may improve to up to
2.5-3.0 TeV.Comment: 23 pages plus appendices, 9 figure
|
Diboson-Jets and the Search for Resonant Zh Production
|
diboson-jets and the search for resonant zh production
|
sizeable boosted bosons scalars. identifying subsequently decays bosons constituting distinctive diboson jet. dilepton prong embedded lepton prong jet. substructure discriminate backgrounds. boson arise utilizing boosted hadronic tend offer prospects accessible masses. luminosity decays sigma models. requiring nonstandard couplings fermiophobic pages appendices
|
non_dup
|
[] |
5259321
|
10.1007/JHEP08(2012)162
|
The type II seesaw mechanism introduces a hypercharged Higgs triplet to
explain the observed neutrino masses and mixing. Among three triplet
components, the doubly charged Higgs boson can be the lightest and decay mainly
to same-sign di-leptons. Furthermore, the heavier singly charged or neutral
Higgs boson produces a doubly charged Higgs boson through its fast gauge decay.
This leads to a novel signature of same-sign tetra-leptons resulting from a
pair production of same-sign doubly charged Higgs bosons caused by the nearly
degenerate neutral scalar mixing which can be sizable for an appropriate choice
of the model parameters. After studying production cross-sections for the
same-sign tetra-lepton signal in the parameter space of the mass splitting
among triplet components and the triplet vacuum expectation value, we provide a
LHC analysis of the same-sign tetra-lepton signal for a benchmark point chosen
to maximize the event number.Comment: 18 pages, 7 figures, Comment on constraints from LFV processes added,
version published in JHE
|
Same-Sign Tetra-Leptons from Type II Seesaw
|
same-sign tetra-leptons from type ii seesaw
|
seesaw introduces hypercharged triplet mixing. triplet doubly boson lightest leptons. heavier singly neutral boson produces doubly boson decay. signature tetra leptons doubly bosons nearly degenerate neutral sizable parameters. studying tetra lepton splitting triplet triplet expectation tetra lepton benchmark maximize pages comment
|
non_dup
|
[] |
2254530
|
10.1007/JHEP08(2012)165
|
We study flavour susceptibilities in the ${\cal N}=4$ SU(N) super Yang-Mills
plasma coupled to two quark flavours at strong coupling and large $N$ by means
of its gravity dual. The off-diagonal susceptibility is 1/N-suppressed and we
compute it as a one-loop effect on the gravity side. Contrary to naive
extrapolation from perturbative results, it attains a finite value in the
infinite-coupling limit. Moreover, its parametric form is independent of
whether or not meson bound states exist in the plasma. We conclude that caution
must be exercised when drawing conclusions about the QCD plasma from lattice
calculations of quark susceptibilities.Comment: 4 page
|
Off-diagonal Flavour Susceptibilities from AdS/CFT
|
off-diagonal flavour susceptibilities from ads/cft
|
flavour susceptibilities super mills flavours dual. diagonal susceptibility suppressed side. contrary naive extrapolation perturbative attains infinite limit. parametric meson plasma. caution exercised drawing
|
non_dup
|
[] |
5256957
|
10.1007/JHEP08(2012)166
|
We derive the exact supergravity profile for the twisted scalar field emitted
by a system of fractional D3 branes at a Z2 orbifold singularity supporting N=2
quiver gauge theories with unitary groups and bifundamental matter. At the
perturbative level this twisted field is "dual" to the gauge coupling but it is
corrected non-perturbatively by an infinite tower of fractional D-instantons.
The explicit microscopic description allows to derive the gravity profile from
disk amplitudes computing the emission rate of the twisted scalar field in
terms of chiral correlators in the dual gauge theory. We compute these quantum
correlators using multi-instanton localization techniques and/or Seiberg-Witten
analysis. Finally, we discuss a non-perturbative relation between the twisted
scalar and the effective coupling of the gauge theory for some simple choices
of the brane set ups.Comment: 42 pages. 3 figures, PDFLaTe
|
Non-perturbative gauge/gravity correspondence in N=2 theories
|
non-perturbative gauge/gravity correspondence in n=2 theories
|
derive supergravity twisted emitted fractional branes orbifold singularity supporting quiver unitary bifundamental matter. perturbative twisted corrected perturbatively infinite tower fractional instantons. microscopic derive amplitudes twisted chiral correlators theory. correlators instanton localization seiberg witten analysis. perturbative twisted choices brane pages. pdflate
|
non_dup
|
[] |
5256624
|
10.1007/JHEP08(2012)167
|
We examine the structure of the shear viscosity to entropy density ratio
eta/s in holographic theories of gravity coupled to a scalar field, in the
presence of higher derivative corrections. Thanks to a non-trivial scalar field
profile, eta/s in this setup generically runs as a function of temperature. In
particular, its temperature behavior is dictated by the shape of the scalar
potential and of the scalar couplings to the higher derivative terms. We
consider a number of dilatonic setups, but focus mostly on phenomenological
models that are QCD-like. We determine the geometric conditions needed to
identify local and global minima for eta/s as a function of temperature, which
translate to restrictions on the signs and ranges of the higher derivative
couplings. Finally, such restrictions lead to an holographic argument for the
existence of a global minimum for eta/s in these models, at or above the
deconfinement transition.Comment: references adde
|
On the Temperature Dependence of the Shear Viscosity and Holography
|
on the temperature dependence of the shear viscosity and holography
|
examine viscosity holographic corrections. thanks trivial setup generically runs temperature. dictated couplings terms. dilatonic setups mostly phenomenological like. geometric minima translate restrictions signs ranges couplings. restrictions holographic argument deconfinement adde
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non_dup
|
[] |
5253617
|
10.1007/JHEP08(2012)168
|
We develop a new renormalization group approach to the large-N limit of
matrix models. It has been proposed that a procedure, in which a matrix model
of size (N-1) \times (N-1) is obtained by integrating out one row and column of
an N \times N matrix model, can be regarded as a renormalization group and that
its fixed point reveals critical behavior in the large-N limit. We instead
utilize the fuzzy sphere structure based on which we construct a new map
(renormalization group) from N \times N matrix model to that of rank N-1. Our
renormalization group has great advantage of being a nice analog of the
standard renormalization group in field theory. It is naturally endowed with
the concept of high/low energy, and consequently it is in a sense local and
admits derivative expansions in the space of matrices. In construction we also
find that our renormalization in general generates multi-trace operators, and
that nonplanar diagrams yield a nonlocal operation on a matrix, whose action is
to transport the matrix to the antipode on the sphere. Furthermore the
noncommutativity of the fuzzy sphere is renormalized in our formalism. We then
analyze our renormalization group equation, and Gaussian and nontrivial fixed
points are found. We further clarify how to read off scaling dimensions from
our renormalization group equation. Finally the critical exponent of the model
of two-dimensional gravity based on our formalism is examined.Comment: 1+42 pages, 4 figure
|
Renormalization group approach to matrix models via noncommutative space
|
renormalization group approach to matrix models via noncommutative space
|
renormalization models. integrating regarded renormalization reveals limit. utilize fuzzy sphere renormalization renormalization great advantage nice analog renormalization theory. naturally endowed admits expansions matrices. renormalization generates trace nonplanar diagrams nonlocal antipode sphere. noncommutativity fuzzy sphere renormalized formalism. analyze renormalization nontrivial found. clarify read renormalization equation. exponent formalism pages
|
non_dup
|
[] |
24934935
|
10.1007/JHEP08(2013)003
|
We investigate deformations of Gauss-Bonnet-Lifshitz holography in $(n+1)$
dimensional spacetime. Marginally relevant operators are dynamically generated
by a momentum scale $\Lambda \sim 0$ and correspond to slightly deformed
Gauss-Bonnet-Lifshitz spacetimes via a holographic picture. To admit
(non-trivial) sub-leading orders of the asymptotic solution for the marginal
mode, we find that the value of the dynamical critical exponent $z$ is
restricted by $z= n-1-2(n-2) \tilde{\alpha}$, where $\tilde{\alpha}$ is the
(rescaled) Gauss-Bonnet coupling constant. The generic black hole solution,
which is characterized by the horizon flux of the vector field and
$\tilde{\alpha}$, is obtained in the bulk, and we explore its thermodynamic
properties for various values of $n$ and $\tilde{\alpha}$.Comment: 40 pages, 13 figure
|
Deformations of Lifshitz holography with the Gauss-Bonnet term in
($n+1$) dimensions
|
deformations of lifshitz holography with the gauss-bonnet term in ($n+1$) dimensions
|
deformations gauss bonnet lifshitz holography spacetime. marginally dynamically lambda deformed gauss bonnet lifshitz spacetimes holographic picture. admit trivial orders asymptotic marginal exponent restricted tilde alpha tilde alpha rescaled gauss bonnet constant. generic horizon tilde alpha explore thermodynamic tilde alpha .comment pages
|
non_dup
|
[] |
24933175
|
10.1007/JHEP08(2013)008
|
Right-handed light quarks could be significantly composite, yet compatible
with experimental searches at the LHC and precision tests on Standard Model
couplings. In these scenarios, that are motivated by flavor physics, one
expects large cross sections for the production of new resonances coupled to
light quarks. We study experimental strong signatures of right-handed
compositeness at the LHC, and constrain the parameter space of these models
with recent results by ATLAS and CMS. We show that the LHC sensitivity could be
significantly improved if dedicated searches were performed, in particular in
multi-jet signals.Comment: 37 pages, 24 figures, version 2 updated to JHEP 08 (2013) 00
|
Strong Signatures of Right-Handed Compositeness
|
strong signatures of right-handed compositeness
|
handed quarks composite compatible searches precision couplings. scenarios motivated flavor expects resonances quarks. signatures handed compositeness constrain atlas cms. dedicated searches pages updated jhep
|
non_dup
|
[] |
24767381
|
10.1007/JHEP08(2013)010
|
We calculate the anomalous magnetic moment of the muon in the minimal
Randall-Sundrum model with standard model fields in five-dimensional (5D)
warped space and a brane-localized Higgs. We use a fully 5D framework to
compute the one-loop matching coefficients of the effective theory at the
electroweak scale. The extra contribution to the anomalous magnetic moment from
the model-independent gauge-boson exchange contributions \Delta a_\mu is
approximately 8.8*10^-11 (1TeV/T)^2, where 1/T denotes the location of the TeV
brane in conformal coordinates, and is related to the mass of the lowest gauge
boson KK excitation, which is roughly 2.5T. The result constitutes the first
complete determination of the gauge-boson contribution to g-2 and is robust
against the variation of the bulk fermion masses and 5D Yukawa coupling. We
also determine the strongly model-parameter dependent effect of Higgs-exchange
diagrams.Comment: 73 pages, 9 figures (V2: extended discussion of Higgs contributions
and effects of wrong-chirality Higgs couplings added, typos corrected,
references added, matches version published on JHEP
|
The muon anomalous magnetic moment in the Randall-Sundrum model
|
the muon anomalous magnetic moment in the randall-sundrum model
|
anomalous moment muon randall sundrum warped brane localized higgs. matching electroweak scale. extra anomalous moment boson delta brane conformal boson roughly constitutes boson robust fermion yukawa coupling. pages wrong chirality couplings typos corrected matches jhep
|
non_dup
|
[] |
24936051
|
10.1007/JHEP08(2013)012
|
We consider holographic entanglement entropy in higher derivative gravity
theories. Recently Lewkowycz and Maldacena arXiv:1304.4926 have provided a
method to derive the equations for the entangling surface from first
principles. We use this method to compute the entangling surface in four
derivative gravity. Certain interesting differences compared to the two
derivative case are pointed out. For Gauss-Bonnet gravity, we show that in the
regime where this method is applicable, the resulting equations coincide with
proposals in the literature as well as with what follows from considerations of
the stress tensor on the entangling surface. Finally we demonstrate that the
area functional in Gauss-Bonnet holography arises as a counterterm needed to
make the Euclidean action free of power law divergences.Comment: 24 pages, 1 figure. v3: typos corrected, published versio
|
Entanglement entropy in higher derivative holography
|
entanglement entropy in higher derivative holography
|
holographic entanglement theories. lewkowycz maldacena derive entangling principles. entangling gravity. pointed out. gauss bonnet applicable coincide proposals considerations entangling surface. gauss bonnet holography arises counterterm euclidean pages figure. typos corrected versio
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non_dup
|
[] |
24935913
|
10.1007/JHEP08(2013)013
|
We proceed to study the integrable structures of two-dimensional non-linear
sigma models defined on three-dimensional Schrodinger spacetimes. We show that
anisotropic Lax pairs are equivalent with isotropic Lax pairs with flat
conserved currents under non-local gauge transformations. Then a quite
non-trivial realization of the undeformed Yangian symmetry Y(sl(2)) is revealed
after an appropriate gauge fixing, which is determined by comparing the gauge
transformation to a quantum Jordanian twist. As a result, an exotic symmetry
found in arXiv:1209.4147 may be interpreted as a Jordanian deformation of
Y(sl(2)).Comment: 40 pages, 2 figures, LaTeX, typos corrected, references added,
further clarificatio
|
Schrodinger Sigma Models and Jordanian Twists
|
schrodinger sigma models and jordanian twists
|
proceed integrable sigma schrodinger spacetimes. anisotropic isotropic conserved currents transformations. trivial realization undeformed yangian fixing jordanian twist. exotic interpreted jordanian deformation .comment pages latex typos corrected clarificatio
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non_dup
|
[] |
24930678
|
10.1007/JHEP08(2013)014
|
Conformal blocks in any number of dimensions depend on two variables z, zbar.
Here we study their restrictions to the special "diagonal" kinematics z = zbar,
previously found useful as a starting point for the conformal bootstrap
analysis. We show that conformal blocks on the diagonal satisfy ordinary
differential equations, third-order for spin zero and fourth-order for the
general case. These ODEs determine the blocks uniquely and lead to an efficient
numerical evaluation algorithm. For equal external operator dimensions, we find
closed-form solutions in terms of finite sums of 3F2 functions.Comment: 21 pages; v2: misprints in Eqs. 2.17 and 4.9 corrected; v3: misprints
in A.5 and A.6 correcte
|
Diagonal Limit for Conformal Blocks in d Dimensions
|
diagonal limit for conformal blocks in d dimensions
|
conformal blocks zbar. restrictions diagonal kinematics zbar conformal bootstrap analysis. conformal blocks diagonal satisfy ordinary fourth case. odes blocks uniquely algorithm. sums pages misprints eqs. corrected misprints correcte
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non_dup
|
[] |
24930358
|
10.1007/JHEP08(2013)021
|
We present a renormalizable non supersymmetric Grand Unified SO(10) model
which, at the price of a large fine tuning, is compatible with all compelling
phenomenological requirements below the unification scale and thus realizes a
minimal extension of the SM, unified in SO(10) and describing all known physics
below $M_{GUT}$. These requirements include coupling unification at a large
enough scale to be compatible with the bounds on proton decay; a Yukawa sector
in agreement with all the data on quark and lepton masses and mixings and with
leptogenesis as the origin of the baryon asymmetry of the Universe; an axion
arising from the Higgs sector of the model, suitable to solve the strong CP
problem and to account for the observed amount of Dark Matter. The above
constraints imposed by the data are very stringent and single out a particular
breaking chain with the Pati-Salam group at an intermediate scale
$M_I\sim10^{11}$ GeV.Comment: references added, minor changes in the text, version to appear in
JHE
|
A non Supersymmetric SO(10) Grand Unified Model for All the Physics
below $M_{GUT}$
|
a non supersymmetric so(10) grand unified model for all the physics below $m_{gut}$
|
renormalizable supersymmetric grand unified fine tuning compatible compelling phenomenological unification realizes unified describing unification compatible bounds proton yukawa lepton mixings leptogenesis baryon asymmetry universe axion arising solve matter. imposed stringent breaking pati salam minor
|
non_dup
|
[] |
24938396
|
10.1007/JHEP08(2013)028
|
We derive an infinite set of recursion formulae for Nekrasov instanton
partition function for linear quiver U(N) supersymmetric gauge theories in 4D.
They have a structure of a deformed version of W_{1+\infty} algebra which is
called SH^c algebra (or degenerate double affine Hecke algebra) in the
literature. The algebra contains W_N algebra with general central charge
defined by a parameter \beta, which gives the $\Omega$ background in Nekrasov's
analysis. Some parts of the formulae are identified with the conformal Ward
identity for the conformal block function of Toda field theory.Comment: 21 pages, 3 figures; v2: minor modifications, typos corrected,
references added; v3: references added, typos corrected; v4: major revision
of section 6, to be published in JHE
|
Extended Conformal Symmetry and Recursion Formulae for Nekrasov
Partition Function
|
extended conformal symmetry and recursion formulae for nekrasov partition function
|
derive infinite recursion formulae nekrasov instanton partition quiver supersymmetric deformed infty degenerate affine hecke literature. beta omega nekrasov analysis. formulae conformal ward conformal toda pages minor modifications typos corrected typos corrected revision
|
non_dup
|
[] |
5238077
|
10.1007/JHEP08(2013)030
|
We compute the asymptotic symmetry of the higher-spin supergravity theory in
AdS_3 and obtain an infinite-dimensional non-linear superalgebra, which we call
the super-W_infinity[lambda] algebra. According to the recently proposed
supersymmetric duality between higher-spin supergravity in an AdS_3 background
and the 't Hooft limit of the N=2 CP^n Kazama-Suzuki model on the boundary,
this symmetry algebra should agree with the 't Hooft limit of the chiral
algebra of the CFT, SW_n. We provide two nontrivial checks of the duality. By
comparing the algebras, we explicitly match the lowest-spin commutation
relations in the super-W_infinity[lambda] with the corresponding commutation
relations in the 't Hooft limit on the CFT side. We also consider the
degenerate representations of the two algebras and find that the spectra of the
chiral primary fields are identical.Comment: 33 pages, references added, some errors corrected, discussions about
the truncation of the shs[lambda] algebra and reobtaining the original
shs[lambda] algebra from the super-W_infinity[lambda] algebra adde
|
Symmetries of Holographic Super-Minimal Models
|
symmetries of holographic super-minimal models
|
asymptotic supergravity infinite superalgebra call super infinity lambda algebra. supersymmetric duality supergravity hooft kazama suzuki agree hooft chiral nontrivial checks duality. algebras explicitly match commutation super infinity lambda commutation hooft side. degenerate representations algebras chiral pages corrected discussions truncation lambda reobtaining lambda super infinity lambda adde
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non_dup
|
[] |
24934866
|
10.1007/JHEP08(2013)032
|
We investigate the thermal photon production from constant magnetic field in
a strongly coupled and anisotropic plasma via the gauge/gravity duality. The
dual geometry with pressure anisotropy is generated from the axion-dilaton
gravity action introduced by Mateos and Trancancelli and the magnetic field is
coupled to fundamental matters(quarks) through the D3/D7 embeddings. We find
that the photon spectra with different quark mass are enhanced at large
frequency when the photons are emitted parallel to the anisotropic direction
with larger pressure or perpendicular to the magnetic field. However, in the
opposite conditions for the emitted directions, the spectra approximately
saturate isotropic results in the absence of magnetic field. On the other hand,
a resonance emerges at moderate frequency for the photon spectrum with heavy
quarks when the photons move perpendicular to the magnetic field. The resonance
is more robust when the photons are polarized along the magnetic field. On the
contrary, in the presence of pressure anisotropy, the resonance will be
suppressed. There exist competing effects of magnetic field and pressure
anisotropy on meson melting in the strongly coupled super Yang-Mills plasma,
while we argue that the suppression led by anisotropy may not be applied to the
quark gluon plasma.Comment: 22 pages, 16 figures, references added, journal versio
|
Holographic Photon Production with Magnetic Field in Anisotropic Plasmas
|
holographic photon production with magnetic field in anisotropic plasmas
|
anisotropic duality. anisotropy axion dilaton mateos trancancelli matters quarks embeddings. photons emitted anisotropic perpendicular field. opposite emitted directions saturate isotropic field. emerges moderate quarks photons move perpendicular field. robust photons polarized field. contrary anisotropy suppressed. competing anisotropy meson melting super mills argue suppression anisotropy gluon pages versio
|
non_dup
|
[] |
24940107
|
10.1007/JHEP08(2013)034
|
At high energy the standard model possesses conformal symmetry at the
classical level. This is reflected at the quantum level by relations between
the different beta functions of the model. These relations are known as the
Weyl consistency conditions. We show that it is possible to satisfy them order
by order in perturbation theory, provided that a suitable coupling constant
counting scheme is used. As a direct phenomenological application, we study the
stability of the standard model vacuum at high energies and compare with
previous computations violating the Weyl consistency conditions.Comment: RevTeX, 13 pages, 5 figure
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Standard Model Vacuum Stability and Weyl Consistency Conditions
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standard model vacuum stability and weyl consistency conditions
|
possesses conformal level. reflected beta model. weyl consistency conditions. satisfy perturbation counting used. phenomenological computations violating weyl consistency revtex pages
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non_dup
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24931594
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10.1007/JHEP08(2013)035
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We investigate the thermalization time scale in the planar limit of the SU(N)
N=4 SYM plasma at strong yet finite 't Hooft coupling by considering its
supergravity dual description, including the full O(alpha'^3) type IIB string
theory corrections. We also discuss on the effects of the leading non-planar
corrections. We use extended geometric probes in the bulk which are dual to
different non-local observables in the N=4 SYM theory. This is carried out
within the framework of dynamical holographic thermalization.Comment: 19 pages, 4 figures. V2: References added, 1 figure added, 1 figure
corrected, enlarged discussions about extended probes, typos corrected.
Published versio
|
Quantum corrections to dynamical holographic thermalization:
entanglement entropy and other non-local observables
|
quantum corrections to dynamical holographic thermalization: entanglement entropy and other non-local observables
|
thermalization planar hooft supergravity alpha corrections. planar corrections. geometric probes observables theory. holographic pages figures. corrected enlarged discussions probes typos corrected. versio
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non_dup
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24936640
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10.1007/JHEP08(2013)036
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The Standard Model electroweak vacuum has been found to be metastable, with
the true stable vacuum given by a large, phenomenologically unacceptable vacuum
expectation value $\approx M_{P}$. Moreover, it may be unstable in an
inflationary universe. Motivated by the necessity of physics beyond the
Standard Model and to accommodate non-zero neutrino masses, we investigate
vacuum stability within type-II seesaw and left-right symmetric models. Our
analysis is performed by solving the renormalisation group equations, carefully
taking into account the relevant threshold corrections. We demonstrate that a
phenomenologically viable left-right symmetric model can be constructed by
matching it with the SM at one-loop. In both models we demonstrate the
existence of a large area of parameter space where the Higgs vacuum is
absolutely stable.Comment: 31 pages, 11 figure
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Neutrino Masses and Higgs Vacuum Stability
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neutrino masses and higgs vacuum stability
|
electroweak metastable phenomenologically unacceptable expectation approx unstable inflationary universe. motivated necessity accommodate seesaw models. solving renormalisation carefully corrections. phenomenologically viable matching loop. absolutely pages
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non_dup
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24940104
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10.1007/JHEP08(2013)039
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We investigate a recent proposal for a distinguished vacuum state of a free
scalar quantum field in an arbitrarily curved spacetime, known as the
Sorkin-Johnston (SJ) vacuum, by applying it to de Sitter space. We derive the
associated two-point functions on both the global and Poincar\'e (cosmological)
patches in general d+1 dimensions. In all cases where it is defined, the SJ
vacuum belongs to the family of de Sitter invariant alpha-vacua. We obtain
different states depending on the spacetime dimension, mass of the scalar
field, and whether the state is evaluated on the global or Poincar\'e patch. We
find that the SJ vacuum agrees with the Euclidean/Bunch-Davies state for heavy
("principal series") fields on the global patch in even spacetime dimensions.
We also compute the SJ vacuum on a causal set corresponding to a causal diamond
in 1+1 dimensional de Sitter space. Our simulations show that the mean of the
SJ two-point function on the causal set agrees well with its expected continuum
counterpart.Comment: 35 pages, 9 figure
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A preferred ground state for the scalar field in de Sitter space
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a preferred ground state for the scalar field in de sitter space
|
proposal distinguished arbitrarily curved spacetime sorkin johnston sitter space. derive poincar cosmological patches dimensions. belongs sitter alpha vacua. spacetime poincar patch. agrees euclidean bunch davies principal patch spacetime dimensions. causal causal diamond sitter space. causal agrees continuum pages
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non_dup
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24944230
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10.1007/JHEP08(2013)041
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Starting from the known unfaithful spinorial representations of the compact
subalgebra K(E10) of the split real hyperbolic Kac-Moody algebra E10 we
construct new fermionic `higher spin' representations of this algebra (for
`spin-5/2' and `spin-7/2', respectively) in a second quantized framework. Our
construction is based on a simplified realization of K(E10) on the Dirac and
the vector spinor representations in terms of the associated roots, and on a
re-definition of the vector spinor first introduced by Damour and Hillmann. The
latter replaces manifestly SO(10) covariant expressions by new expressions that
are covariant w.r.t. SO(1,9), the invariance group of the DeWitt metric
restricted to the space of scale factors. We present explicit expressions for
all K(E10) elements that are associated to real roots of the hyperbolic algebra
(of which there are infinitely many), as well as novel explicit realizations of
the generators associated to imaginary roots and their multiplicities. We also
discuss the resulting realizations of the Weyl group.Comment: 33 page
|
On higher spin realizations of K(E10)
|
on higher spin realizations of k(e10)
|
unfaithful spinorial representations subalgebra split hyperbolic moody fermionic representations quantized framework. simplified realization dirac spinor representations roots spinor damour hillmann. replaces manifestly covariant expressions expressions covariant w.r.t. invariance dewitt restricted factors. expressions roots hyperbolic infinitely realizations generators imaginary roots multiplicities. realizations weyl
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non_dup
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24938413
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10.1007/JHEP08(2013)042
|
We construct supersymmetric completions of various curvature squared terms in
five dimensional supergravity with eight supercharges. Adopting the dilaton
Weyl multiplet, we obtain the minimal off-shell supersymmetric Ricci scalar
squared as well as all vector multiplets coupled curvature squared invariants.
Since the minimal off-shell supersymmetric Riemann tensor squared and
Gauss-Bonnet combination in the dilaton Weyl multiplet have been obtained
before, both the minimal off-shell and the vector multiplets coupled curvature
squared invariants in the dilation Weyl multiplet are complete. We also
constructed an off-shell Ricci scalar squared invariant utilizing the standard
Weyl multiplet. The supersymmetric Ricci scalar squared in the standard Weyl
multiplet is coupled to n number of vector multiplets by construction, and it
deforms the very special geometry. We found that in the supersymmetric AdS_5
vacuum, the very special geometry defined on the moduli space is modified in a
simple way. Finally, we study the magnetic string and electric black hole
solutions in the presence of supersymmetric Ricci scalar squared.Comment: 28 pages, v3: Typos Corrected, Version appeared in JHE
|
All Off-Shell R^2 Invariants in Five Dimensional N=2 Supergravity
|
all off-shell r^2 invariants in five dimensional n=2 supergravity
|
supersymmetric completions curvature squared supergravity eight supercharges. adopting dilaton weyl multiplet supersymmetric ricci squared multiplets curvature squared invariants. supersymmetric riemann squared gauss bonnet dilaton weyl multiplet multiplets curvature squared invariants dilation weyl multiplet complete. ricci squared utilizing weyl multiplet. supersymmetric ricci squared weyl multiplet multiplets deforms geometry. supersymmetric moduli way. supersymmetric ricci pages typos corrected appeared
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non_dup
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16517548
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10.1007/JHEP08(2013)043
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We bootstrap the all-loop dynamic S-matrix for the homogeneous psu(1,1|2)^2 spin-chain believed to correspond to the discretization of the massive modes of string theory on AdS_3 x S^3 x T^4. The S-matrix is the tensor product of two copies of the su(1|1)^2 invariant S-matrix constructed recently for the d(2,1;alpha)^2 chain, and depends on two antisymmetric dressing phases. We write down the crossing equations that these phases have to satisfy. Furthermore, we present the corresponding Bethe Ansatz, which differs from the one previously conjectured, and discuss how our construction matches several recent perturbative calculations
|
The all-loop integrable spin-chain for strings on AdS_3 x S^3 x T^4: the massive sector
|
the all-loop integrable spin-chain for strings on ads_3 x s^3 x t^4: the massive sector
|
bootstrap homogeneous believed discretization massive copies alpha antisymmetric dressing phases. crossing satisfy. bethe ansatz differs conjectured matches perturbative
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non_dup
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24936638
|
10.1007/JHEP08(2013)045
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We study the holographic light meson spectra and their mass splitting in the
nuclear medium. In order to describe the nuclear matter, we take into account
the thermal charged AdS geometry with two flavor charges, which can be
reinterpreted as the number densities of proton and neutron after some field
redefinitions. We show that the meson mass splitting occurs when there exists
the density difference between proton and neutron. Depending on the flavor
charge, the mass of the positively (negatively) charged meson increases
(decreases) as the density difference increases, whereas the neutral meson mass
is independent of the density difference. In the regime of the large nucleon
density with a relatively large number difference between proton and neutron,
we find that negatively charged pion becomes massless in the nuclear medium, so
the pion condensate can occur. We also investigate the binding energy of a
heavy quarkonium in the nuclear medium, in which the binding energy of a heavy
quarkonium becomes weaker as the density difference increases.Comment: 22 pages, 5 figures, references adde
|
Holographic meson mass splitting in the Nuclear Matter
|
holographic meson mass splitting in the nuclear matter
|
holographic meson splitting medium. flavor charges reinterpreted densities proton neutron redefinitions. meson splitting proton neutron. flavor positively negatively meson neutral meson difference. nucleon proton neutron negatively pion massless pion condensate occur. quarkonium quarkonium weaker pages adde
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non_dup
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[] |
24931751
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10.1007/JHEP08(2013)047
|
We study open spin chains for strings stretched between giant graviton states
in the N=4 SYM field theory in the collective coordinate approach. We study the
boundary conditions and the effective Hamiltonian of the corresponding spin
chain to two loop order.
The ground states of the spin chain have energies that match the relativistic
dispersion relation characteristic of massive W boson particles on the
worldvolume of the giant graviton configurations, up to second order in the
limit where the momentum is much larger than the mass. We find evidence for a
non-renormalization theorem for the ground state wave function of this spin
chain system. We also conjecture a generalization of this result to all loop
orders which makes it compatible with a fully relativistic dispersion relation.
We show that the conjecture follows if one assumes that the spin chain admits a
central charge extension that is sourced by the giant gravitons, generalizing
the giant magnon dispersion relation for closed string excitations. This
provides evidence for ten dimensional local physics mixing AdS directions and
the five-sphere emerging from an N=4 SYM computation in the presence of a
non-trivial background (made of D-branes) that break the conformal field theory
of the system.Comment: 48 pages, 3 figures. v2: typos fixe
|
Open spin chains for giant gravitons and relativity
|
open spin chains for giant gravitons and relativity
|
chains strings stretched giant graviton collective coordinate approach. order. match relativistic massive boson worldvolume giant graviton configurations mass. renormalization system. conjecture generalization orders compatible relativistic relation. conjecture assumes admits sourced giant gravitons generalizing giant magnon excitations. directions sphere emerging trivial branes break conformal pages figures. typos fixe
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non_dup
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[] |
158836161
|
10.1007/JHEP08(2013)048
|
The non-linear second order Born-Infeld equation is reduced to a simpler first order complex equation, which can be trivially solved for the coordinates as functions of the field. Each solution is determined by the choice of a holomorphic function subjected to boundary conditions. The explanation of the method is accompanied by applications to Born-Infeld electrostatics, magnetostatics and wave propagation.Fil: Ferraro, Rafael. Consejo Nacional de Investigaciónes Científicas y Técnicas. Oficina de Coordinación Administrativa Ciudad Universitaria. Instituto de Astronomía y Física del Espacio. - Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales. Instituto de Astronomía y Física del Espacio; Argentin
|
Two-dimensional solutions for Born-Infeld fields
|
two-dimensional solutions for born-infeld fields
|
born infeld simpler trivially solved field. holomorphic subjected conditions. explanation accompanied born infeld electrostatics magnetostatics propagation.fil ferraro rafael. consejo nacional investigaciónes científicas técnicas. oficina coordinación administrativa ciudad universitaria. instituto astronomía física espacio. universidad buenos aires. facultad ciencias exactas naturales. instituto astronomía física espacio argentin
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non_dup
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[] |
24932294
|
10.1007/JHEP08(2013)049
|
We present various (0,2) heterotic supercurrent supermultiplets in (1+1)
dimensional quantum field theories. From the minimal supercurrent
supermultiplets, we deduce conditions on symmetry enhancement such as Lorentz
invariance, (chiral) dilatation invariance, R-invariance, (chiral) conformal
invariance and their various combinations. Our construction covers many
interesting and/or exotic possibilities such as Lifshitz supersymmetry and
warped superconformal algebra. We also discuss the corresponding supergravity
by gauging the supercurrent supermultiplet. In particular, we propose a novel
class of heterotic supergravity based on the virial supercurrent.Comment: 40 pages, minor correction
|
Zoology of heterotic supercurrent supermultiplets in d=2
|
zoology of heterotic supercurrent supermultiplets in d=2
|
heterotic supercurrent supermultiplets theories. supercurrent supermultiplets deduce enhancement lorentz invariance chiral dilatation invariance invariance chiral conformal invariance combinations. covers exotic possibilities lifshitz supersymmetry warped superconformal algebra. supergravity gauging supercurrent supermultiplet. propose heterotic supergravity virial pages minor
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non_dup
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24932039
|
10.1007/JHEP08(2013)050
|
We investigate the entanglement temperature of a small scale subsystem in low
excited states by using holographic method. Especially, we study the
entanglement entropy and entanglement temperature in higher derivative
gravities which are considered as low thermal excitation of pure AdS gravity.
We find that the entanglement entropy are related to the central charges of
boundary CFT. The relation between the variance of entanglement entropy and
energy of a small scale subsystem has been also obtained. Furthermore, the
relation is consistent with the first law-like relation that is proposed by
Phys. Rev. Lett. 110, 091602 (2013). Finally, we derive the formula of the
variance of entanglement entropy in general excited states in gravity
background with the Fefferman-Graham coordinates and the entanglement
temperature can be figured out in special case.Comment: 26 pages, references added, more typos corrected, accepted by JHE
|
Note on Entanglement Temperature for Low Thermal Excited States in
Higher Derivative Gravity
|
note on entanglement temperature for low thermal excited states in higher derivative gravity
|
entanglement subsystem excited holographic method. entanglement entanglement gravities gravity. entanglement charges cft. entanglement subsystem obtained. phys. rev. lett. derive entanglement excited fefferman graham entanglement figured pages typos corrected
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non_dup
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158829082
|
10.1007/JHEP08(2013)052
|
During the '70, several relativistic quantum field theory models in D = 1 + 1 and also in D = 2 + 1 have been constructed in a non-perturbative way. That was done in the so-called constructive quantum field theory approach, whose main results have been obtained by a clever use of Euclidean functional methods. Although in the construction of a single model there are several technical steps, some of them involving long proofs, the constructive quantum field theory approach contains conceptual insights about relativistic quantum field theory that deserved to be known and which are accessible without entering in technical details. The purpose of this note is to illustrate such insights by providing an oversimplified schematic exposition of the simple case of lambda(Phi)4 (with m > 0) in D = 1 + 1. Because of the absence of ultraviolet divergences in its perturbative version, this simple example , although does not capture all the difficulties in the constructive quantum field theory approach, allows to stress those difficulties inherent to the non-perturbative definition. We have made an effort in order to avoid several of the long technical intermediate steps without missing the main ideas and making contact with the usual language of the perturbative approach.Fil: Gueron, Jorge. Universidad Católica Argentina. Facultad de Ciencias Fisico Matemáticas e Ingeniería. Departamento de Matemática; ArgentinaFil: Leston, Mauricio. Consejo Nacional de Investigaciónes Científicas y Técnicas. Oficina de Coordinación Administrativa Ciudad Universitaria. Instituto de Astronomía y Física del Espacio. - Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales. Instituto de Astronomía y Física del Espacio; Argentin
|
Non-perturbative λΦ4 in D=1+1: an example of the constructive quantum field theory approach in a schematic way
|
non-perturbative λφ4 in d=1+1: an example of the constructive quantum field theory approach in a schematic way
|
relativistic perturbative way. constructive clever euclidean methods. involving proofs constructive conceptual insights relativistic deserved accessible entering details. illustrate insights oversimplified schematic exposition lambda ultraviolet divergences perturbative capture difficulties constructive difficulties inherent perturbative definition. effort avoid missing ideas usual perturbative approach.fil gueron jorge. universidad católica argentina. facultad ciencias fisico matemáticas ingeniería. departamento matemática argentinafil leston mauricio. consejo nacional investigaciónes científicas técnicas. oficina coordinación administrativa ciudad universitaria. instituto astronomía física espacio. universidad buenos aires. facultad ciencias exactas naturales. instituto astronomía física espacio argentin
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non_dup
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24936291
|
10.1007/JHEP08(2013)055
|
We present results from a new calculation of two- and three-body decays of
the gravitino including all possible Feynman graphs. The work is done in the
R-parity conserving Minimal Supersymmetric Standard Model, assuming that the
gravitino is unstable. We calculate the full width for the three-body decay
process Gravitino -> \chi_1 X Y, where \chi_1 is the lightest neutralino that
plays the role of the lightest supersymmetric particle, and X, Y are standard
model particles. For calculating the squared amplitudes we use the packages
FeynArts and FormCalc, with appropriate extensions to accommodate the gravitino
with spin 3/2. Our code treats automatically the intermediate exchanged
particles that are on their mass shell, using the narrow width approximation.
This method considerably simplifies the complexity of the evaluation of the
total gravitino width and stabilizes it numerically. At various points of the
supersymmetric parameter space, we compare the full two-body and the three-body
results with approximations used in the past. In addition, we discuss the
relative sizes of the full two-body and the three-body gravitino decay widths.
Our results are obtained using the package GravitinoPack, that will be publicly
available soon, including various handy features.Comment: 29 pages, 24 eps figures. Version to appear in JHE
|
Three-body gravitino decays in the MSSM
|
three-body gravitino decays in the mssm
|
decays gravitino feynman graphs. parity conserving supersymmetric gravitino unstable. gravitino lightest neutralino plays lightest supersymmetric particles. calculating squared amplitudes packages feynarts formcalc extensions accommodate gravitino treats automatically exchanged narrow approximation. considerably simplifies gravitino stabilizes numerically. supersymmetric approximations past. sizes gravitino widths. package gravitinopack publicly soon handy pages figures.
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non_dup
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24940924
|
10.1007/JHEP08(2013)056
|
Day-night asymmetries in active-sterile solar neutrino oscillations are
discussed in the general $3+N_{s}$ mixing framework with three active and N_s
sterile neutrinos. Analytical expressions of the probability of neutrino flavor
transitions in the Earth in the perturbative approximation and in the slab
approximation are presented and the effects of active-sterile mixing and of the
CP-violating phases are discussed. The accuracy of the analytical
approximations and the properties of the day-night asymmetries are illustrated
numerically in the 3+1 neutrino mixing framework.Comment: 30 pages, 8 gigures, publshed in JHE
|
Day-Night Asymmetries in Active-Sterile Solar Neutrino Oscillations
|
day-night asymmetries in active-sterile solar neutrino oscillations
|
night asymmetries sterile oscillations sterile neutrinos. expressions flavor earth perturbative slab sterile violating discussed. approximations night asymmetries illustrated numerically pages gigures publshed
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non_dup
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24936548
|
10.1007/JHEP08(2013)063
|
We compute R\'enyi entropies for a spherical entangling surface in
four-dimensional N=4 super-Yang-Mills at strong coupling using the AdS/CFT
correspondence. Incorporating the effects of the leading \alpha' corrections to
the low energy effective action of type IIB string theory, we calculate the
leading corrections in inverse powers of the 't Hooft coupling (and the number
of colours). The results are compared with known weak coupling calculations.
Setting the order of the R\'enyi entropy q to one, it reduces to the
entanglement entropy and the strong and weak coupling results match without any
corrections, as expected. In the limit of q going to 0, the relation between
the strong and weak coupling entropies is connected to the known corrections
for the thermal free energy in flat space. We also compute the correction to
the scaling dimension of twist operators.Comment: 29 pages, 3 figure
|
Holographic R\'enyi Entropies at Finite Coupling
|
holographic r\'enyi entropies at finite coupling
|
enyi entropies spherical entangling super mills correspondence. incorporating alpha powers hooft colours calculations. enyi reduces entanglement match expected. going entropies space. twist pages
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non_dup
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[] |
24942795
|
10.1007/JHEP08(2013)069
|
A dynamical origin of the Yukawa couplings is a promising scenario to explain
the flavour puzzle. The focus of this letter is set on the role of the neutrino
Majorana character: when an $O(2)_{N_R}$ flavour symmetry acts on the
right-handed neutrino sector, the minimum of the scalar potential allows for
large mixing angles -in contrast to the simplest quark case- and predicts a
maximal Majorana phase. This leads to a strong correlation between neutrino
mass hierarchy and mixing pattern. Realistic solutions point to the existence
of three heavy right-handed neutrinos.Comment: 8 pages. V2: references added; results unchange
|
Leptonic Dynamical Yukawa Couplings
|
leptonic dynamical yukawa couplings
|
yukawa couplings promising flavour puzzle. letter majorana character flavour acts handed angles simplest predicts maximal majorana phase. hierarchy pattern. realistic handed pages. unchange
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non_dup
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16488573
|
10.1007/JHEP08(2013)070
|
The two-loop QCD corrections to vector boson pair production at hadron colliders involve a new class of Feynman integrals: two-loop four-point functions with two off-shell external legs. We describe their reduction to a small set of master integrals by solving linear relations among them. We then use differential equations in the external invariants to compute all master integrals that are relevant to planar Feynman amplitudes. Our results are expressed analytically in terms of generalized harmonic polylogarithms. The calculation relies heavily on techniques that exploit the algebraic structure of these functions, which we describe in detail
|
Two-loop master integrals for $ q\overline{q}\to VV $ : the planar topologies
|
two-loop master integrals for $ q\overline{q}\to vv $ : the planar topologies
|
boson hadron colliders involve feynman integrals legs. master integrals solving them. invariants master integrals planar feynman amplitudes. analytically harmonic polylogarithms. relies heavily exploit algebraic
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non_dup
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24765462
|
10.1007/JHEP08(2013)073
|
We discuss the moduli stabilization in a de Sitter compactification model
obtained coupling D-dimensional gravity to scalar and gauge fields. This class
of models is characterized by two moduli: one related to the volume of the
internal space, the other to the warp factor. While the volume modulus can be
fixed by appropriately tuning the gauge field strength, curvature of the
internal space, and cosmological constant, the same mechanism does not work for
the warp modulus. In this paper we discuss a stabilization mechanism based on
quantum effects and show that both moduli can be efficiently stabilized.Comment: 26 pages, 8 figures, Journal versio
|
Moduli Stabilization in a de Sitter Compactification Model
|
moduli stabilization in a de sitter compactification model
|
moduli stabilization sitter compactification fields. moduli warp factor. modulus appropriately tuning curvature cosmological warp modulus. stabilization moduli efficiently pages versio
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non_dup
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24939817
|
10.1007/JHEP08(2013)074
|
We construct a holographic model of heavy-light mesons by extending the
AdS/QCD to incorporate the behavior of the heavy quark limit. In that limit,
the QCD dynamics is governed by the light quark and the heavy quark simply
plays the role of a static color source. The heavy quark spin symmetry can be
treated as a global symmetry in the AdS bulk. As a consequence, the heavy-light
mesons are mapped to "fermions" in the AdS theory. The light flavor chiral
symmetry is naturally built in by this construction, and its breaking produces
the splitting of the parity-doubled heavy-light meson states. The scaling
dependences of physical quantities on the heavy quark mass in the heavy quark
effective theory are reproduced. The mass spectra and decay constants of the B
and D mesons can be well fit by suitable choices of model parameters. The
couplings between the heavy-light mesons and the pions are also calculated. The
holographic model may capture the essence of the long distance effects of QCD
and can serve as a useful tool for studying the non-perturbative hadronic
matrix elements involving heavy-light mesons.Comment: 31 pages, 2 figure
|
A Holographic Model of Heavy-light Mesons
|
a holographic model of heavy-light mesons
|
holographic mesons extending incorporate limit. governed plays source. bulk. mesons mapped fermions theory. flavor chiral naturally built breaking produces splitting parity doubled meson states. dependences quantities reproduced. mesons choices parameters. couplings mesons pions calculated. holographic capture essence serve studying perturbative hadronic involving pages
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non_dup
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24934971
|
10.1007/JHEP08(2013)076
|
We continue to investigate the relationship between the infrared physics of
N=2 supersymmetric gauge theories in four dimensions and various integrable
models such as Gaudin, Calogero-Moser and quantum spin chains. We prove
interesting dualities among some of these integrable systems by performing
different, albeit equivalent, quantizations of the Seiberg-Witten curve of the
four dimensional theory. We also discuss conformal field theories related to
N=2 4d gauge theories by the Alday-Gaiotto-Tachikawa (AGT) duality and the role
of conformal blocks of those CFTs in the integrable systems. As a consequence,
the equivalence of conformal blocks of rank two Toda and
Novikov-Wess-Zumino-Witten (WZNW) theories on the torus with punctures is
found.Comment: 37 pages, 10 figures, references added, figures modified, JHEP
versio
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On the Integrability of Four Dimensional N=2 Gauge Theories in the Omega
Background
|
on the integrability of four dimensional n=2 gauge theories in the omega background
|
continue infrared supersymmetric integrable gaudin calogero moser chains. dualities integrable performing albeit quantizations seiberg witten theory. conformal alday gaiotto tachikawa duality conformal blocks cfts integrable systems. equivalence conformal blocks toda novikov wess zumino witten wznw torus punctures pages jhep versio
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non_dup
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24942414
|
10.1007/JHEP08(2013)077
|
In the NMSSM it is well possible to find an additional Higgs boson with a
mass below 125 GeV which remains invisible in standard Higgs boson search
channels. We study the Higgs pair production cross sections times branching
fractions in this scenario, focusing on gluon fusion and the bb+tautau and
bb+gammagamma final states. Summing over the SM-like and the lighter Higgs
states, the production cross sections times branching fractions are never below
the ones for SM Higgs pair production. Sizable enhancements of the signal rates
are also possible, notably if a lighter Higgs state is produced. However, the
rates involving at least one lighter Higgs boson are not always sufficiently
large to guarantee its discovery.Comment: 14 pages, 17 figures, references adde
|
Higgs pair production in the NMSSM at the LHC
|
higgs pair production in the nmssm at the lhc
|
nmssm boson invisible boson channels. branching fractions focusing gluon fusion tautau gammagamma states. summing lighter branching fractions never production. sizable enhancements notably lighter produced. involving lighter boson sufficiently guarantee pages adde
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non_dup
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24933677
|
10.1007/JHEP08(2013)078
|
In this paper, we move from a "proof of concept" to challenging predictions
in a flavour model emerging from a single fermion family in six dimensions
(6-D) with the two extra dimensions compactified on a sphere. The most striking
predictions (beyond the basic ingredients already demonstrated for a realistic
quark mass pattern) are for the neutrino sector. Not only can 4-D Majorana
masses be generated from 6-D (where no Majorana spinors exist), but Majorana
masses are naturally associated to large mixing. The model favours inverted
hierarchy and a quasi-Dirac partial suppression of neutrinoless double beta
decay.Comment: 18 pages, 1 figure. v2: minor clarifications. Version accepted by
JHE
|
Neutrino hierarchy and fermion spectrum from a single family in six
dimensions: realistic predictions
|
neutrino hierarchy and fermion spectrum from a single family in six dimensions: realistic predictions
|
move challenging flavour emerging fermion extra compactified sphere. striking ingredients realistic sector. majorana majorana spinors majorana naturally mixing. favours inverted hierarchy quasi dirac suppression neutrinoless beta pages figure. minor clarifications.
|
non_dup
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24936227
|
10.1007/JHEP08(2013)081
|
We propose a general formula for the perturbative large N superconformal
index of 5d quiver fixed point theories that have an AdS(6)xS(4)/Z(n)
supergravity dual. This index is obtained from the parent theory by projecting
to orbifold-invariant states and adding the twisted sector contributions. Our
result agrees with expectations from the dual supergravity description. We test
our formula against the direct computation of the index for Z(2) and Z(3) and
find complete agreement.Comment: 18 pages, no figure
|
5d superconformal indices at large N and holography
|
5d superconformal indices at large n and holography
|
propose perturbative superconformal quiver supergravity dual. parent projecting orbifold adding twisted contributions. agrees expectations supergravity description. pages
|
non_dup
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[] |
6206402
|
10.1007/JHEP08(2013)088
|
We consider the prospects for natural SUSY models consistent with current
data. Recent constraints make the standard paradigm unnatural so we consider
what could be a minimal extension consistent with what we now know. The most
promising such scenarios extend the MSSM with new tree-level Higgs interactions
that can lift its mass to at least 125 GeV and also allow for flavor-dependent
soft terms so that the third generation squarks are lighter than current bounds
on the first and second generation squarks. We argue that a common feature of
almost all such models is the need for a new scale near 10 TeV, such as a scale
of Higgsing or confinement of a new gauge group. We consider the question
whether such a model can naturally derive from a single mass scale associated
with supersymmetry breaking. Most such models simply postulate new scales,
leaving their proximity to the scale of MSSM soft terms a mystery. This
coincidence problem may be thought of as a mild tuning, analogous to the usual
mu problem. We find that a single mass scale origin is challenging, but suggest
that a more natural origin for such a new dynamical scale is the gravitino
mass, m_{3/2}, in theories where the MSSM soft terms are a loop factor below
m_{3/2}. As an example, we build a variant of the NMSSM where the singlet S is
composite, and the strong dynamics leading to compositeness is triggered by
masses of order m_{3/2} for some fields. Our focus is the Higgs sector, but our
model is compatible with a light stop (with the other generation squarks heavy,
or with R-parity violation or another mechanism to hide them from current
searches). All the interesting low-energy mass scales, including linear terms
for S playing a key role in EWSB, arise dynamically from the single scale
m_{3/2}. However, numerical coefficients from RG effects and wavefunction
factors in an extra dimension complicate the otherwise simple story.Comment: 32 pages, 3 figures; version accepted by JHE
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Single-Scale Natural SUSY
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single-scale natural susy
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prospects susy data. paradigm unnatural know. promising scenarios extend mssm lift flavor squarks lighter bounds squarks. argue higgsing confinement group. naturally derive supersymmetry breaking. postulate leaving proximity mssm mystery. coincidence thought mild tuning analogous usual problem. challenging gravitino mssm build variant nmssm singlet composite compositeness triggered fields. compatible stop squarks parity violation hide searches playing ewsb arise dynamically wavefunction extra complicate pages
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non_dup
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24937093
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10.1007/JHEP08(2013)089
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We study membrane configurations in AdS_{7/4}xS^{4/7}. The membranes are
wrapped around the compact manifold S^{4/7} and are dynamically equivalent to
bosonic strings in AdS_5. We thus conveniently identify them as "Stringy
Membranes". For the case of AdS_7xS^4, their construction is carried out by
embedding the Polyakov action for classical bosonic strings in AdS_5, into the
corresponding membrane action. Therefore, every string configuration in AdS_5
can be realized by an appropriately chosen stringy membrane in AdS_7xS^4. We
discuss the possibility of this being also the case for stringy membranes in
AdS_4xS^7/Z^k (k > 1 or k = 1). By performing a stability analysis to the
constructed solutions, we find that the (membrane) fluctuations along their
transverse directions are organized in multiple Lam\'{e} stability bands and
gaps in the space of parameters of the configurations. In this membrane
picture, strings exhibit a single band/gap structure.Comment: 40 pages, 9 figures; published versio
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Stringy Membranes in AdS/CFT
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stringy membranes in ads/cft
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configurations membranes wrapped manifold dynamically bosonic strings conveniently stringy membranes embedding polyakov bosonic strings action. realized appropriately stringy stringy membranes performing directions organized gaps configurations. picture strings exhibit pages versio
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non_dup
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[] |
24935814
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10.1007/JHEP08(2013)096
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Recent observations by Belle and BESIII of charged quarkonium-like resonances
give new stimulus for theoretical investigation of exotic hadrons in general
and heavy tetraquarks in particular. We use QED_2, a confining theory, as a
model for the masses and decays of tetraquarks. Here we discuss the states (Q
Qbar q qbar) and (Q Q qbar qbar) (and its anti-particle), where Q and q are two
fermion flavors with masses M and m, so that M > m. We then discuss decay modes
of these states into (Q Qqbar), (q qbar), (Q qbar), (Qbar q). It turns out that
(Q Qbar q qbar) is stable, while (Q Q qbar qbar) is not.Comment: LaTeX, 9 pages, 2 figures; notation clarified, some minor correction
|
Tetraquarks, their Masses and Decays in QED_2
|
tetraquarks, their masses and decays in qed_2
|
belle besiii quarkonium resonances stimulus exotic hadrons tetraquarks particular. confining decays tetraquarks. qbar qbar qbar qbar fermion flavors qqbar qbar qbar qbar turns qbar qbar qbar qbar latex pages notation clarified minor
|
non_dup
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[] |
24933141
|
10.1007/JHEP08(2013)097
|
In continuation with our studies of Lifshitz like D$p$-brane solutions, we
propose a class of 1/4 BPS supersymmetric interpolating solutions which
interpolate between IR Lifshitz solutions and UV AdS solutions smoothly. We
demonstrate properties of these classical solutions near the two fixed points.
These interpolating solutions are then used to calculate the entanglement
entropies of strip-like subsystems. With these bulk solutions the entropy
functional also gets modified. We also make a curious observation about the
electric-magnetic duality and the thermal entropy of the Hodge-dual Lifshitz
D$p$ brane systems.Comment: 18 pages; v2: minor changes, including a bad typo in the eqs of
Sec-(4.3), references adde
|
Lifshitz to AdS flow with interpolating p-brane solutions
|
lifshitz to ads flow with interpolating p-brane solutions
|
continuation lifshitz brane propose supersymmetric interpolating interpolate lifshitz smoothly. points. interpolating entanglement entropies strip subsystems. gets modified. curious duality hodge lifshitz brane pages minor typo adde
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non_dup
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[] |
24944328
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10.1007/JHEP08(2013)099
|
We extend recent work on the relation of 4d and 3d IR dualities of
supersymmetric gauge theories with four supercharges to the case of orthogonal
gauge groups. The distinction between different SO(N) gauge theories in 4d
plays an important role in this relation. We show that the 4d duality leads to
a 3d duality between an SO(N_c) gauge theory with N_f flavors and an
SO(N_f-N_c+2) theory with N_f flavors and extra singlets, and we derive its
generalization in the presence of Chern-Simons terms. There are two different
O(N) theories in 3d, which we denote by O(N)_\pm, and we also show that the
O(N_c)_- gauge theory is dual to a Spin(N_f-N_c+2) theory, and derive from 4d
the known duality between O(N_c)_+ and O(N_f-N_c+2)_+. We verify the
consistency of these 3d dualities by various methods, including index
computations.Comment: 49 pages, harvmac. v2: a minor chang
|
3d dualities from 4d dualities for orthogonal groups
|
3d dualities from 4d dualities for orthogonal groups
|
extend dualities supersymmetric supercharges orthogonal groups. distinction plays relation. duality duality flavors flavors extra singlets derive generalization chern simons terms. derive duality verify consistency dualities pages harvmac. minor chang
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non_dup
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[] |
34596034
|
10.1007/JHEP08(2013)100
|
We deform the action and the supersymmetry transformations of the d=10 and d=4 Maxwell supermultiplets so that at each order of the deformation the theory has 16 Maxwell multiplet deformed supersymmetries as well as 16 Volkov-Akulov type non-linear supersymmetries. The result agrees with the expansion in the string tension of the explicit action of the Dirac-Born-Infeld model and its supersymmetries, extracted from D9 and D3 superbranes, respectively. The half-maximal Dirac-Born-Infeld models with 8 Maxwell supermultiplet deformed supersymmetries and 8 Volkov-Akulov type supersymmetries are described by a new class of d=6 vector branes related to chiral (2,0) supergravity, which we denote as `Vp-branes'. We use a space-filling V5 superbrane for the d=6 model and a V3 superbrane for the d=4 half-maximal Dirac-Born-Infeld (DBI) models. In this way we present a completion to all orders of the deformation of the Maxwell supermultiplets with maximal 16+16 supersymmetries in d=10 and 4, and half-maximal 8+8 supersymmetries in d=6 and 4.status: publishe
|
Dirac-Born-Infeld-Volkov-Akulov and deformation of supersymmetry
|
dirac-born-infeld-volkov-akulov and deformation of supersymmetry
|
deform supersymmetry transformations maxwell supermultiplets deformation maxwell multiplet deformed supersymmetries volkov akulov supersymmetries. agrees tension dirac born infeld supersymmetries superbranes respectively. maximal dirac born infeld maxwell supermultiplet deformed supersymmetries volkov akulov supersymmetries branes chiral supergravity branes filling superbrane superbrane maximal dirac born infeld models. completion orders deformation maxwell supermultiplets maximal supersymmetries maximal supersymmetries .status publishe
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non_dup
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[] |
24932138
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10.1007/JHEP08(2013)101
|
We study the S-matrix of planar $\mathcal{N}=4$ supersymmetric Yang-Mills
theory when external momenta are restricted to a two-dimensional subspace of
Minkowski space. We find significant simplifications and new, interesting
structures for tree and loop amplitudes in two-dimensional kinematics; in
particular, the higher-point amplitudes we consider can be obtained from those
with lowest-points by a collinear uplifting. Based on a compact formula for
one-loop N${}^2$MHV amplitudes, we use an equation proposed previously to
compute, for the first time, the complete two-loop NMHV and three-loop MHV
octagons, which we conjecture to uplift to give the full $n$-point amplitudes
up to simpler logarithmic terms or dilogarithmic terms.Comment: v2: important typos fixed. 38 pages, 4 figures. An ancillary file
with two-loop NMHV "remainders" for n=10,12 can be found at
http://www.nbi.dk/~schuot/nmhvremainders.zi
|
Three-loop octagons and n-gons in maximally supersymmetric Yang-Mills
theory
|
three-loop octagons and n-gons in maximally supersymmetric yang-mills theory
|
planar mathcal supersymmetric mills momenta restricted subspace minkowski space. simplifications amplitudes kinematics amplitudes collinear uplifting. amplitudes nmhv octagons conjecture uplift amplitudes simpler logarithmic dilogarithmic typos fixed. pages figures. ancillary file nmhv remainders www.nbi.dk schuot nmhvremainders.zi
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non_dup
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[] |
24941517
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10.1007/JHEP08(2013)106
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We perform the fit of electroweak precision observables within the Standard
Model with a 126 GeV Higgs boson, compare the results with the theoretical
predictions and discuss the impact of recent experimental and theoretical
improvements. We introduce New Physics contributions in a model-independent way
and fit for the S, T and U parameters, for the $\epsilon_{1,2,3,b}$ ones, for
modified $Zb\bar{b}$ couplings and for a modified Higgs coupling to vector
bosons. We point out that composite Higgs models are very strongly constrained.
Finally, we compute the bounds on dimension-six operators relevant for the
electroweak fit.Comment: 44 pages, 12 figures. v2: references added, version to appear in JHE
|
Electroweak Precision Observables, New Physics and the Nature of a 126
GeV Higgs Boson
|
electroweak precision observables, new physics and the nature of a 126 gev higgs boson
|
electroweak precision observables boson improvements. epsilon couplings bosons. composite constrained. bounds electroweak pages figures.
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non_dup
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[] |
24938858
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10.1007/JHEP08(2013)110
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The precise determination of the cross section for electron-positron
annihilation into hadrons is one of the central tasks of ongoing experiments at
low energy colliders. These measurements have to be complemented by Monte Carlo
generators which simulate a large number of final states and include higher
order radiative corrections. With this motivation in mind the generator
PHOKHARA is extended to allow for the simulation of final states with zero, one
or two real photons. At the same time corrections from the emission of one or
two virtual photons are included, such that a full next-to-next-to leading
order generator is available. The stability and consistency of the program is
tested. The results (for muon-pair final states) are compared to the programs
KKMC and MCGPJ and implications for the analysis of various hadronic final
states are investigated.Comment: references added, minor modifications to the tex
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Simulation of electron-positron annihilation into hadrons with the event
generator PHOKHARA
|
simulation of electron-positron annihilation into hadrons with the event generator phokhara
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precise positron annihilation hadrons tasks ongoing colliders. complemented monte carlo generators simulate radiative corrections. motivation mind generator phokhara photons. virtual photons generator available. consistency tested. muon programs kkmc mcgpj hadronic minor modifications
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non_dup
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