pinecone/core-2020-05-10-deduplication huggingface dataset:
Some aspects of QGP phase in a hQCD model

We continue to study the holographic QCD (hQCD) model, proposed in a previous
paper, in an Einstein-Maxwell-Dilaton (EMD) system. In this paper we discuss
some aspects of quark gluon plasma (QGP) in the hQCD model, such as drag force,
jet quenching parameter and screening length. The results turn out to be
consistent with those as expected in QCD qualitatively. By calculating free
energy of the background black hole solution, we find that there exists a
Hawking-Page phase transition between small black hole and big black hole when
chemical potential $\mu $ is less than a critical one $ \mu_c$, and the phase
transition is absent when chemical potential is beyond the critical one.Comment: 31 pages,15 figures, LaTeX, Statements and figures have been
  improved. Accepted by JHE
Coupling spans of the Higgs-like boson

Using the LHC and Tevatron data, we set upper and lower limits on the total
width of the Higgs-like boson. The upper limit is based on the well-motivated
assumption that the Higgs coupling to a W or Z pair is not much larger than in
the Standard Model. These width limits allow us to convert the rate
measurements into ranges for the Higgs couplings to various particles. A
corollary of the upper limit on the total width is an upper limit on the
branching fraction of exotic Higgs decays. Currently, this limit is 47% at the
95% CL if the electroweak symmetry is broken only by doublets.Comment: 18 pages, 2 figures; v2: Minor clarifications, references adde
Vacuum Stability of Standard Model^{++}

The latest results of the ATLAS and CMS experiments point to a preferred
narrow Higgs mass range (m_h \simeq 124 - 126 GeV) in which the effective
potential of the Standard Model (SM) develops a vacuum instability at a scale
10^{9} -10^{11} GeV, with the precise scale depending on the precise value of
the top quark mass and the strong coupling constant. Motivated by this
experimental situation, we present here a detailed investigation about the
stability of the SM^{++} vacuum, which is characterized by a simple extension
of the SM obtained by adding to the scalar sector a complex SU(2) singlet that
has the quantum numbers of the right-handed neutrino, H", and to the gauge
sector an U(1) that is broken by the vacuum expectation value of H". We derive
the complete set of renormalization group equations at one loop. We then pursue
a numerical study of the system to determine the triviality and vacuum
stability bounds, using a scan of 10^4 random set of points to fix the initial
conditions. We show that, if there is no mixing in the scalar sector, the top
Yukawa coupling drives the quartic Higgs coupling to negative values in the
ultraviolet and, as for the SM, the effective potential develops an instability
below the Planck scale. However, for a mixing angle -0.35 \alt \alpha \alt
-0.02 or 0.01 \alt \alpha \alt 0.35, with the new scalar mass in the range 500
GeV \alt m_{h"} \alt 8 TeV, the SM^{++} ground state can be absolutely stable
up to the Planck scale. These results are largely independent of TeV-scale free
parameters in the model: the mass of the non-anomalous U(1) gauge boson and its
branching fractions.Comment: 17 revtex pages, 8 figures; to be published in JHE
Mass hierarchy, 2-3 mixing and CP-phase with Huge Atmospheric Neutrino
  Detectors

We explore the physics potential of multi-megaton scale ice or water
Cherenkov detectors with low ($\sim 1$ GeV) threshold. Using some proposed
characteristics of the PINGU detector setup we compute the distributions of
events versus neutrino energy $E_\nu$ and zenith angle $\theta_z$, and study
their dependence on yet unknown neutrino parameters. The $(E_\nu - \theta_z)$
regions are identified where the distributions have the highest sensitivity to
the neutrino mass hierarchy, to the deviation of the 2-3 mixing from the
maximal one and to the CP-phase. We evaluate significance of the measurements
of the neutrino parameters and explore dependence of this significance on the
accuracy of reconstruction of the neutrino energy and direction. The effect of
degeneracy of the parameters on the sensitivities is also discussed. We
estimate the characteristics of future detectors (energy and angle resolution,
volume, etc.) required for establishing the neutrino mass hierarchy with high
confidence level. We find that the hierarchy can be identified at $3\sigma$ --
$10\sigma$ level (depending on the reconstruction accuracies) after 5 years of
PINGU operation.Comment: 39 pages, 21 figures. Description of Fig.3 correcte
The NMSSM with F-theory unified boundary conditions.

We study the phenomenological viability of a constrained NMSSM with parameters subject to unified boundary conditions from F-theory GUTs. We find that very simple assumptions about modulus dominance SUSY breaking in F-theory unification lead to a predictive set of boundary conditions, consistent with all phenomenological constraints. The second lightest scalar Higgs H2 can get a mass m H 2  ≃125 \ud
mH2≃125\ud
 GeV and has properties similar to the SM Higgs. On the other hand the lightest scalar H1, with a dominant singlet component, would have barely escaped detection at LEP and could be observable at LHC as a peak in H1 → γγ at around 100 GeV. The LSP is mostly singlino and is consistent with WMAP constraints due to coannihilation with the lightest stau, whose mass is in the range 100 − 250 GeV. Such light staus may lead to very characteristic signatures at LHC and be directly searched at linear colliders. In these models tan β is large, of order 50, still the branching ratio for Bs → μ+μ− is consistent with the LHCb bounds and in many cases is also even smaller than the SM prediction. Gluinos and squarks have masses in the 2−3 TeV region and may be accessible at the LHC at 14TeV. No large enhancement of the H2 → γγ rate over that of the SM Higgs is expected
Can New Colored Particles Illuminate the Higgs?

We analyze the behavior of Higgs to diphoton rate and Higgs gluon-gluon
production cross section in minimal extensions of the Standard Model comprising
new colored vector-like fermions that do not mix with the ordinary ones. We
compare these information with constraints coming from electroweak precision
measurements. We compute pair production cross sections for the lightest
fermion and discuss the LHC bounds. Finally, we study the phenomenology of
possible quarkonium states composed by these new colored fermions.Comment: 18 pages, 7 figures. v2: typos fixed, references added, small
  improvements mad
NLO QCD corrections to tW' and tZ' production in forward-backward
  asymmetry models

We consider Z' and W' models recently proposed to explain the top
forward-backward asymmetry at the Tevatron. We present the next-to-leading
order QCD corrections to associated production of such vector bosons together
with top quarks at the Large Hadron Collider, for centre-of-mass energies of 7
and 8 TeV. The corrections are significant, modifying the total production
cross-section by 30-50%. We consider the effects of the corrections on the top
and vector-boson kinematics. The results are directly applicable to current
experimental searches, for both the ATLAS and CMS collaborations.Comment: 62 pages, 13 figures, 36 tables. v3 Updated to correspond to Journal
  version and incorporate supplementary materia
Probing higher spin black holes

We study the propagation of scalar fields on various backgrounds in three
dimensional higher spin gravity. Our main emphasis is on obtaining the
bulk-boundary propagator, which can be efficiently computed using group theory
and higher spin gauge symmetry and from which we can extract scalar two-point
functions in the dual CFT. As an illustration, we obtain a simple closed form
expression for the propagator in a particular spin-3 deformation of AdS_3. In
the case of higher spin black holes, we prove on general grounds that the
propagator respects an imaginary time periodicity consistent with the thermal
nature of the black hole; in doing so we make progress in understanding the
group exponentiation of the higher spin Lie algebra hs[\lambda], and its
center. We also explicitly compute the propagator in the black hole background
at first order in the higher spin charge. Evaluated on the Lorentzian section,
the result is consistent with an interpretation in which the black hole has two
causally disconnected boundary components, as is the case for the BTZ black
hole.Comment: 41 pages. v3: corrected typo
Effective field theory in time-dependent settings

We use the in-in or Schwinger-Keldysh formalism to explore the construction
and interpretation of effective field theories for time-dependent systems
evolving out of equilibrium. Starting with a simple model consisting of a heavy
and a light scalar field taken to be in their free vacuum states at a finite
initial time, we study the effects from the heavy field on the dynamics of the
light field by analyzing the equation of motion for the expectation value of
the light background field. New terms appear which cannot arise from a local
action of an effective field theory in terms of the light field, though they
disappear in the adiabatic limit. We discuss the origins of these terms as well
as their possible implications for time dependent situations such as inflation.Comment: 37 pages, 5 figure
The classification of two-loop integrand basis in pure four-dimension

In this paper, we have made the attempt to classify the integrand basis of
all two-loop diagrams in pure four-dimension space-time. Our classification
includes the topology of two-loop diagrams which determines the structure of
denominators, and the set of numerators under different kinematic
configurations of external momenta by using Gr\"{o}bner basis method. In our
study, the variety defined by setting all propagators to on-shell has played an
important role. We discuss the structure of variety and how it splits to
various irreducible branches when external momenta at each corner of diagrams
satisfy some special kinematic conditions. This information is crucial to the
numerical or analytical fitting of coefficients for integrand basis in
reduction process.Comment: 52 pages, 9 figures. v2 reference added, v3 published versio
Accidental SUSY: Enhanced bulk supersymmetry from brane back-reaction

We compute how bulk loops renormalize both bulk and brane effective interactions for codimension-two branes in 6D gauged chiral supergravity, as functions of the brane tension and brane-localized flux. We do so by explicitly integrating out hyper- and gauge-multiplets in 6D gauged chiral supergravity compactified to 4D on a flux-stabilized 2D rugby-ball geometry, specializing the results of a companion paper, arXiv:1210.3753 , to the supersymmetric case. While the brane back-reaction generically breaks supersymmetry, we show that the bulk supersymmetry can be preserved if the amount of brane- localized flux is related in a specific BPS-like way to the brane tension, and verify that the loop corrections to the brane curvature vanish in this special case. In these systems it is the brane-bulk couplings that fix the size of the extra dimensions, and we show that in some circumstances the bulk geometry dynamically adjusts to ensure the supersymmetric BPS-like condition is automatically satisfied. We investigate the robustness of this residual supersymmetry to loops of non-supersymmetric matter on the branes, and show that supersymmetry- breaking effects can enter only through effective brane-bulk interactions involving at least two derivatives. We comment on the relevance of this calculation to proposed applications of codimension-two 6D models to solutions of the hierarchy and cosmological constant problems
BCJ duality and the double copy in the soft limit

We examine the structure of infrared singularities in QCD and quantum General
Relativity, from the point of view of the recently conjectured double copy
property which relates scattering amplitudes in non-Abelian gauge theories with
gravitational counterparts. We show that IR divergences in both theories are
consistent with the double copy procedure, to all orders in perturbation
theory, thus providing all loop-level evidence for the conjecture. We further
comment on the relevance, or otherwise, to the so-called dipole formula, a
conjecture for the complete structure of IR singularities in QCD.Comment: 33 pages, 10 figures. Sections 3.1 and 3.2 corrected and expanded; to
  appear in JHE
New spinorial particle model in tensorial space-time and interacting
  higher spin fields

The Maxwell-covariant particle model is formulated in tensorial extended D=4
space-time (x_mu, z_{mu nu}) parametrized by ten-dimensional coset of D=4
Maxwell group, with added auxiliary Weyl spinors lambda_alpha, y^alpha. We
provide the Hamiltonian quantization of the model and demonstrate that first
class constraints modify the known equations obtained for massless higher spin
fields in flat tensorial space-time. We obtain the Maxwell-covariant field
equations for new infinite dimensional spin multiplets. The component fields
assigned to different spin values are linked by couplings proportional to
rescaled electromagnetic coupling constant \tilde e = em, where m is the
mass-like parameter introduced in our model. We discuss briefly the geometry of
our tensorial space-time with constant torsion and its relation with the
presence of constant electromagnetic background.Comment: 19 pages, LaTeX; v2:version which appears in JHE
Gauge invariant definition of the jet quenching parameter

In the framework of Soft-Collinear Effective Theory, the jet quenching
parameter, $\hat{q}$, has been evaluated by adding the effect of Glauber gluon
interactions to the propagation of a highly-energetic collinear parton in a
medium. The result, which holds in covariant gauges, has been expressed in
terms of the expectation value of two Wilson lines stretching along the
direction of the four-momentum of the parton. In this paper, we show how that
expression can be generalized to an arbitrary gauge by the addition of
transverse Wilson lines. The transverse Wilson lines are explicitly computed by
resumming interactions of the parton with Glauber gluons that appear only in
non-covariant gauges. As an application of our result, we discuss the
contribution to $\hat{q}$ coming from transverse momenta of order $g^2T$ in a
medium that is a weakly-coupled quark-gluon plasma.Comment: 31 pages, 7 figures; journal versio
On recursion relations in topological string theory

We discuss a link between the topological recursion relations derived
algebraically by Witten and the holomorphic anomaly equation of Bershadsky,
Cecotti, Ooguri and Vafa. This is obtained through the definition of an
operator ${\cal{W}}_s$ that reproduces the recursion relations for topological
string theory coupled to worldsheet gravity a la BCOV. This operator is
contained inside an algebra that generalizes the tt* equations and whose direct
consequence is the holomorphic anomaly equation itself.Comment: v3: matches the version to appear on JHE
Strange Couplings to the Higgs

We explored the coupling of strange quark to the state of mass close to 126
GeV recently observed by the ATLAS and CMS experiments at the LHC. An enhanced
coupling relative to the expectations for a SM Higgs has the effect of
increasing both the inclusive production cross section and the partial decay
width into jets. For very large modifications, the latter dominates and the net
rate into non-jet decay modes such as diphotons is suppressed, with the result
that one can use observations of the diphoton decay mode to place an upper
limit on the strange quark coupling. We find that the current observations of
the diphoton decay mode imply that the coupling of the new resonance to strange
quark can be at most ~ 50 times the SM expectation at the 95 % C.L., if one
assumes at most a O(1) modification of the coupling to gluons.Comment: 10 pages, 3 figure
Cosmologically viable gauge mediation

Gauge mediation provides us with a complete picture of supersymmetry breaking
and its mediation within the effective field theories, and thus allows us to
discuss consistencies with low-energy particle physics as well as cosmological
observations. We study in detail the cosmological evolution of the
pseudo-modulus field in the supersymmetry breaking sector and also the
production of the gravitinos in the early Universe in a simple (but a complete)
model of gauge mediation. Under fairly reasonable assumptions, it is found that
there exists a parameter region where dark matter of the Universe is explained
by both thermally and non-thermally produced gravitinos, while the baryon
asymmetry of the Universe is generated through the thermal leptogenesis.Comment: 25 pages, 6 figure
All solutions of the localization equations for N=2 quantum black hole
  entropy

We find the most general bosonic solution to the localization equations
describing the contributions to the quantum entropy of supersymmetric black
holes in four-dimensional N=2 supergravity coupled to n_v vector multiplets.
This requires the analysis of the BPS equations of the corresponding off-shell
supergravity (including fluctuations of the auxiliary fields) with AdS2 \times
S2 attractor boundary conditions. Our work completes and extends the results of
arXiv:1012.0265 that were obtained for the vector multiplet sector, to include
the fluctuations of all the fields of the off-shell supergravity. We find that,
when the auxiliary SU(2) gauge field strength vanishes, the most general
supersymmetric configuration preserving four supercharges is labelled by n_v+1
real parameters corresponding to the excitations of the conformal mode of the
graviton and the scalars of the n_v vector multiplets. In the general case, the
localization manifold is labelled by an additional SU(2) triplet of one-forms
and a scalar function.Comment: 27 page
Up asymmetries from exhilarated composite flavor structures

We present a class of warped extra dimension (composite Higgs) models which conjointly accommodates the tt¯forward-backward asymmetry observed at the Tevatron and the direct CP asymmetry in singly Cabibbo suppressed D decays first reported by the LHCb collaboration. We argue that both asymmetries, if arising dominantly from new physics beyond the Standard Model, hint for a flavor paradigm within partial compositeness models in which the right-handed quarks of the first two generations are not elementary fields but rather composite objects. We show that this class of models is consistent with current data on flavor and CP violating physics, electroweak precision observables, dijet and top pair resonance searches at hadron colliders. These models have several predictions which will be tested in forthcoming experiments. The CP asymmetry in D decays is induced through an effective operator of the form (¯uc)V +A(¯ss)V +A at the charm scale, which implies a larger CP asymmetry in the D0 → K+K− rate relative the D0 → π +π − channel. This prediction is distinctive from other Standard Model or dipole-based new physics interpretation of the LHCb result. CP violation in D−D¯ mixing as well as an an excess of dijet production of the LHC are also predicted to be observed in a near future. A large top asymmetry originates from the exchange of an axial resonance which dominantly produces left-handed top pairs. As a result a negative contribution to the lepton-based forward-backward asymmetry in tt¯ production, as well as O(10%) forward-backward asymmetry in b ¯b production above mb¯b ≃ 600 GeV at the Tevatron is expected.Fil: Da Rold, Leandro. Comisión Nacional de Energía Atómica. Centro Atómico Bariloche; Argentina. Comisión Nacional de Energía Atómica. Gerencia del Area de Energía Nuclear. Instituto Balseiro; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas; ArgentinaFil: Delaunay, Cédric. Cern - European Organization For Nuclear Research; SuizaFil: Grojean, Christophe. Cern - European Organization For Nuclear Research; SuizaFil: Perez, Gilad. Cern - European Organization For Nuclear Research; Suiza. Weizmann Institute of Science; Israe
Non-dissipative hydrodynamics : effective actions versus entropy current.

While conventional hydrodynamics incorporating dissipative effects is hard to derive from an action principle, it is nevertheless possible to construct classical actions when the dissipative terms are switched off. In this note we undertake a systematic exploration of such constructions from an effective field theory approach and argue for the existence of non-trivial second order non-dissipative hydrodynamics involving pure energy-momentum transport. We find these fluids to be characterized by five second-order transport coefficients based on the effective action (a three parameter family is Weyl invariant). On the other hand since all flows of such fluids are non-dissipative, they entail zero entropy production; one can therefore understand them using the entropy current formalism which has provided much insight into hydrodynamic transport. An analysis of the most general stress tensor with zero entropy production however turns out to give a seven parameter family of non-dissipative hydrodynamics (a four parameter sub-family being Weyl invariant). The non-dissipative fluids derived from the effective action approach are a special case of the fluid dynamics constrained by conservation of the entropy current. We speculate on the reasons for the mismatch and potential limitations of the effective action approach
The second order hydrodynamic transport coefficient κ for the gluon plasma from the lattice

The quark gluon plasma produced in heavy ion collisions behaves like an almost ideal fluid described by viscous hydrodynamics with a number of transport coefficients. The second order coefficient κ is related to a Euclidean correlator of the energy-momentum tensor at vanishing frequency and low momentum. This allows for a lattice determination without maximum entropy methods or modelling, but the required lattice sizes represent a formidable challenge. We calculate κ in leading order lattice perturbation theory and simulations on 120 3  × 6, 8 lattices with a  < 0.1 fm. In the temperature range 2 T c  − 10 T c we find κ  = 0.36(15) T 2 . The error covers both a suitably rescaled AdS/CFT prediction as well as, remarkably, the result of leading order perturbation theory. This suggests that appropriate noise reduction methods on the lattice and NLO perturbative calculations could provide an accurate QCD prediction in the near future
Transition magnetic moment of Majorana neutrinos in the μν SSM

The nonzero vacuum expectative values of sneutrinos induce spontaneously R-parity and lepton number violation, and generate three tiny Majorana neutrino masses through the seesaw mechanism in the μν SSM, which is one of Supersymmetric extensions beyond Standard Model. Applying effective Lagrangian method, we study the transition magnetic moment of Majorana neutrinos in the model here. Under the constraints from neutrino oscillations, we consider the two possibilities on the neutrino mass spectrum with normal or inverted ordering
N=1 SUSY AdS4 vacua in IIB SUGRA on group manifolds

We study N=1 compactification of IIB supergravity to AdS4. The internal
manifold must have SU(2)-structure. By putting some restrictions on the SU(2)
torsion classes, we can perform an exhaustive scan of all possible solutions on
group manifolds. We show that sourceless solutions don't exist and that the
presence of O5 and O7 orientifolds is mandatory. We also find a new solution
and relate it by T-duality to a known type IIA solution with O6 planes.Comment: 22 pages, (v2) : Appendix on the name of the solvmanifold added,
  references updated, NS Bianchi Identity rewritte