pinecone/core-2020-05-10-deduplication huggingface dataset:
Does the `Higgs' have Spin Zero?

The Higgs boson is predicted to have spin zero. The ATLAS and CMS experiments
have recently reported of an excess of events with mass ~ 125 GeV that has some
of the characteristics expected for a Higgs boson. We address the questions
whether there is already any evidence that this excess has spin zero, and how
this possibility could be confirmed in the near future. The excess observed in
the gamma gamma final state could not have spin one, leaving zero and two as
open possibilities. We calculate the angular distribution of gamma gamma pairs
from the decays of a spin-two boson produced in gluon-gluon collisions, showing
that is unique and distinct from the spin-zero case. We also calculate the
distributions for lepton pairs that would be produced in the W W* decays of a
spin-two boson, which are very different from those in Higgs decays, and note
that the kinematics of the event selection used to produce the excess observed
in the W W* final state have reduced efficiency for spin two.Comment: 22 pages, 22 figures, Version accepted for publication in JHEP,
  includes additional plots of dilepton mass distribution
Non-equilibrium Dynamics of O(N) Nonlinear Sigma models: a Large-N
  approach

We study the time evolution of the mass gap of the O(N) non-linear sigma
model in 2+1 dimensions due to a time-dependent coupling in the large-$N$
limit. Using the Schwinger-Keldysh approach, we derive a set of equations at
large $N$ which determine the time dependent gap in terms of the coupling.
These equations lead to a criterion for the breakdown of adiabaticity for slow
variation of the coupling leading to a Kibble-Zurek scaling law. We describe a
self-consistent numerical procedure to solve these large-$N$ equations and
provide explicit numerical solutions for a coupling which starts deep in the
gapped phase at early times and approaches the zero temperature equilibrium
critical point $g_c$ in a linear fashion. We demonstrate that for such a
protocol there is a value of the coupling $g= g_c^{\rm dyn}> g_c$ where the gap
function vanishes, possibly indicating a dynamical instability. We study the
dependence of $g_c^{\rm dyn}$ on both the rate of change of the coupling and
the initial temperature. We also verify, by studying the evolution of the mass
gap subsequent to a sudden change in $g$, that the model does not display
thermalization within a finite time interval $t_0$ and discuss the implications
of this observation for its conjectured gravitational dual as a higher spin
theory in $AdS_4$.Comment: 22 pages, 9 figures. Typos corrected, references rearranged and
  added.v3 : sections rearranged, abstract modified, comment about Kibble-Zurek
  scaling correcte
Large N Free Energy of 3d N=4 SCFTs and AdS/CFT

We provide a non-trivial check of the AdS_4/CFT_3 correspondence recently
proposed in arXiv:1106.4253 by verifying the GKPW relation in the large N
limit. The CFT free energy is obtained from the previous works
(arXiv:1105.2551, arXiv:1105.4390) on the S^3 partition function for
3-dimensional N=4 SCFT T[SU(N)]. This is matched with the computation of the
type IIB action on the corresponding gravity background. We unexpectedly find
that the leading behavior of the free energy at large N is 1/2 N^2 ln N. We
also extend our results to richer theories and argue that 1/2 N^2 ln N is the
maximal free energy at large N in this class of gauge theories.Comment: 20 pages, 3 figure
Ramond-Ramond Cohomology and O(D,D) T-duality

In the name of supersymmetric double field theory, superstring effective
actions can be reformulated into simple forms. They feature a pair of vielbeins
corresponding to the same spacetime metric, and hence enjoy double local
Lorentz symmetries. In a manifestly covariant manner --with regard to O(D,D)
T-duality, diffeomorphism, B-field gauge symmetry and the pair of local Lorentz
symmetries-- we incorporate R-R potentials into double field theory. We take
them as a single object which is in a bi-fundamental spinorial representation
of the double Lorentz groups. We identify cohomological structure relevant to
the field strength. A priori, the R-R sector as well as all the fermions are
O(D,D) singlet. Yet, gauge fixing the two vielbeins equal to each other
modifies the O(D,D) transformation rule to call for a compensating local
Lorentz rotation, such that the R-R potential may turn into an O(D,D) spinor
and T-duality can flip the chirality exchanging type IIA and IIB
supergravities.Comment: 1+37 pages, no figure; Structure reorganized, References added, To
  appear in JHEP. cf. Gong Show of Strings 2012
  (http://wwwth.mpp.mpg.de/members/strings/strings2012/strings_files/program/Talks/Thursday/Gongshow/Lee.pdf
IIA Perspective On Cascading Gauge Theory

We study the N=1 supersymmetric cascading gauge theory found in type IIB
string theory on p regular and M fractional D3-branes at the tip of the
conifold, using the T-dual type IIA description. We reproduce the
supersymmetric vacuum structure of this theory, and show that the IIA analog of
the non-supersymmetric state found by Kachru, Pearson and Verlinde in the IIB
description is metastable in string theory, but the barrier for tunneling to
the supersymmetric vacuum goes to infinity in the field theory limit. We also
comment on the N=2 supersymmetric gauge theory corresponding to regular and
fractional D3-branes on a near-singular K3, and clarify the origin of the
cascade in this theory.Comment: 43 pages, 18 figures, harvma
The Effective Field Theory of Cosmological Large Scale Structures

Large scale structure surveys will likely become the next leading
cosmological probe. In our universe, matter perturbations are large on short
distances and small at long scales, i.e. strongly coupled in the UV and weakly
coupled in the IR. To make precise analytical predictions on large scales, we
develop an effective field theory formulated in terms of an IR effective fluid
characterized by several parameters, such as speed of sound and viscosity.
These parameters, determined by the UV physics described by the Boltzmann
equation, are measured from N-body simulations. We find that the speed of sound
of the effective fluid is c_s^2 10^(-6) and that the viscosity contributions
are of the same order. The fluid describes all the relevant physics at long
scales k and permits a manifestly convergent perturbative expansion in the size
of the matter perturbations \delta(k) for all the observables. As an example,
we calculate the correction to the power spectrum at order \delta(k)^4. The
predictions of the effective field theory are found to be in much better
agreement with observation than standard cosmological perturbation theory,
already reaching percent precision at this order up to a relatively short scale
k \sim 0.24 h/Mpc.Comment: v2: typos corrected, JHEP published versio
Orientifolds and the Refined Topological String

We study refined topological string theory in the presence of orientifolds by
counting second-quantized BPS states in M-theory. This leads us to propose a
new integrality condition for both refined and unrefined topological strings
when orientifolds are present. We define the SO(2N) refined Chern-Simons theory
which computes refined open string amplitudes for branes wrapping Seifert
three-manifolds. We use the SO(2N) refined Chern-Simons theory to compute new
invariants of torus knots that generalize the Kauffman polynomials. At large N,
the SO(2N) refined Chern-Simons theory on the three-sphere is dual to refined
topological strings on an orientifold of the resolved conifold, generalizing
the Gopakumar-Sinha-Vafa duality. Finally, we use the (2,0) theory to define
and solve refined Chern-Simons theory for all ADE gauge groups
Constraints on the Universal Varying Yukawa Couplings: from SM-like to
  Fermiophobic

Varying the Standard Model (SM) fermion Yukawa couplings universally by a
generic positive scale factor ($F_{Yu}$), we study the phenomenological fit to
the current available experimental results for the Higgs boson search at hadron
colliders. We point out that the Higgs production cross section and its decay
branching ratio to $\gamma\gamma$ can be varied oppositely by $F_{Yu}$ to make
their product almost invariant. Thus, our scenario and the SM Higgs are
indistinguishable in the inclusive $H\to \gamma\gamma$ channel. The current
measurements on direct Yukawa coupling strength in the $H\to b\bar{b}/\tau\tau$
channel are not precise enough to fix the scale factor $F_{Yu}$. The most
promising is the vector-boson-fusion channel in which the CMS has already
observed possible suppression effect on the Yukawa couplings. Further more, the
global $\chi^2$ fit of the experimental data can get the optimal value by
introducing a suppression factor $F_{Yu}\sim1/2$ on the SM Yukawa couplings.Comment: 16 pages, 12 figures, 5 tables, update analysis is supplemente
Three-point functions of BMN operators at weak and strong coupling II.
  One loop matching

In a previous paper, arXiv:1204.3096, we have shown that the fully dynamical
three-point correlation functions of BMN operators are identical at the tree
level in the planar limit of perturbative field theory and, on the string
theory side, calculated by means of the Dobashi-Yoneya three string vertex in
the Penrose limit. Here we present a one-loop calculation of the same quantity
both on the field-theory and string-theory side, where a complete identity
between the two results is demonstrated.Comment: 14 pages, 2 figures, references adde
d-Wave holographic superconductors with backreaction in external
  magnetic fields

We study the d-wave holographic superconductors (the d-wave model proposed in
[arXiv:1003.2991[hep-th]]) immersed in constant external magnetic fields by
using the analytic matching method and numerical computation. In the probe
limit, we calculate the spatially dependent condensate solution in the presence
of the magnetism and find that the expression for the upper critical magnetic
field satisfies the relation given in the Ginzburg-Landau theory. The result
shows that the upper critical field gradually increases to its maximum value
$B_{c2}$ at absolute zero temperature T=0, while vanishing at the critical
temperature $T=T_c$. Moving away from the probe limit, we investigate the
effect of spacetime backreaction on the critical temperature and the upper
critical magnetic field. The magnetic fields as well as the electric fields
acting as gravitational sources reduce the critical temperature of the
superconductor and actually result in a dyonic black hole solution to the
leading order. We obtain the expression for the upper critical magnetic field
up to $\mathcal{O}(\kappa^2)$ order. The analytic result is consistent with the
numerical findings.Comment: 23 pages, 7 figures. typos corrected. to appear in JHEP. arXiv admin
  note: text overlap with arXiv:1105.433
Higher Derivative BLG: Lagrangian and Supersymmetry Transformations

Working to lowest non-trivial order in fermions, we consider the
four-derivative order corrected Lagrangian and supersymmetry transformations of
the Euclidean Bagger-Lambert-Gustavsson theory. By demonstrating supersymmetric
invariance of the Lagrangian we determine all numerical coefficients in the
system. In addition, the supersymmetry algebra is shown to close on the scalar
and gauge fields. We also comment on the extension to Lorentzian and other
non-Euclidean $\mathcal{N}=8$ 3-algebra theories.Comment: 23 page
Novel Parity Violating Transport Coefficients in 2+1 Dimensions from
  Holography

We construct a 3+1 dimensional holographic model dual to a parity violating
hydrodynamic system in 2+1 dimensions. Our model contains gravitational and
electrodynamic Chern-Simons terms coupled to a neutral pseudo scalar $\theta$,
and a potential composed of quadratic and quartic terms in $\theta$. The
background is a charged black brane. We study the hydrodynamics to first order
in spacetime derivatives near the probe limit of the pseudo scalar, by
extracting the transport coefficients from the scalar, vector, and tensor modes
of bulk perturbations. We study two mechanisms for breaking the parity of the
boundary fluid: the parity is either spontaneously broken by the nonzero vev of
the dual pseudo scalar operator, or by the pseudo scalar source on the
boundary. The resulting transport coefficients have unusual behaviors compared
to those in ordinary materials.Comment: Latex, 1+34 pages, 13 figures. v2 typos corrected, 4 references
  added, a paragraph discussing ref [37] added in Section 5. v3 to match the
  published versio
Diffractive Higgs Production by AdS Pomeron Fusion

The double diffractive Higgs production at central rapidity is formulated in
terms of the fusion of two AdS gravitons/Pomerons first introduced by Brower,
Polchinski, Strassler and Tan in elastic scattering. Here we propose a simple
self-consistent holographic framework capable of providing phenomenologically
compelling estimates of diffractive cross sections at the LHC. As in the
traditional weak coupling approach, we anticipate that several phenomenological
parameters must be tested and calibrated through factorization for a
self-consistent description of other diffractive process such as total cross
sections, deep inelastic scattering and heavy quark production in the central
region.Comment: 53 pages, 8 figure
Duality covariant non-BPS first order systems

We study extremal black hole solutions to four dimensional N=2 supergravity
based on a cubic symmetric scalar manifold. Using the coset construction
available for these models, we define the first order flow equations implied by
the corresponding nilpotency conditions on the three-dimensional scalar momenta
for the composite non-BPS class of multi-centre black holes. As an application,
we directly solve these equations for the single-centre subclass, and write the
general solution in a manifestly duality covariant form. This includes all
single-centre under-rotating non-BPS solutions, as well as their
non-interacting multi-centre generalisations.Comment: 31 pages, v2: Discussion of the quadratic constraint clarified,
  references added, typos corrected, published versio
Dirac Gauginos, Negative Supertraces and Gauge Mediation

In an attempt to maximize General Gauge Mediated parameter space, I propose
simple models in which gauginos and scalars are generated from disconnected
mechanisms. In my models Dirac gauginos are generated through the supersoft
mechanism, while independent R-symmetric scalar masses are generated through
operators involving non-zero messenger supertrace. I propose several new
methods for generating negative messenger supertraces which result in viable
positive mass squareds for MSSM scalars. The resultant spectra are novel,
compressed and may contain light fermionic SM adjoint fields.Comment: 16 pages 3 figure
The concept of quasi-integrability for modified non-linear Schrodinger
  models

We consider modifications of the nonlinear Schrodinger model (NLS) to look at
the recently introduced concept of quasi-integrability. We show that such
models possess an infinite number of quasi-conserved charges which present
intriguing properties in relation to very specific space-time parity
transformations. For the case of two-soliton solutions where the fields are
eigenstates of this parity, those charges are asymptotically conserved in the
scattering process of the solitons. Even though the charges vary in time their
values in the far past and the far future are the same. Such results are
obtained through analytical and numerical methods, and employ adaptations of
algebraic techniques used in integrable field theories. Our findings may have
important consequences on the applications of these models in several areas of
non-linear science. We make a detailed numerical study of the modified NLS
potential of the form V = |psi|^(2(2+epsilon)), with epsilon being a
perturbation parameter. We perform numerical simulations of the scattering of
solitons for this model and find a good agreement with the results predicted by
the analytical considerations. Our paper shows that the quasi-integrability
concepts recently proposed in the context of modifications of the sine-Gordon
model remain valid for perturbations of the NLS model.Comment: 39 pages, 12 figure
Charge Expulsion from Black Brane Horizons, and Holographic Quantum
  Criticality in the Plane

Quantum critical behavior in 2+1 dimensions is established via holographic
methods in a 5+1-dimensional Einstein gravity theory with gauge potential form
fields of rank 1 and 2. These fields are coupled to one another via a
tri-linear Chern-Simons term with strength k. The quantum phase transition is
physically driven by the expulsion of the electric charge from inside the black
brane horizon to the outside, where it gets carried by the gauge fields which
acquire charge thanks to the Chern-Simons interaction. At a critical value
k=k_c, zero temperature, and any finite value of the magnetic field, the IR
behavior is governed by a near-horizon Lifshitz geometry. The associated
dynamical scaling exponent depends on the magnetic field. For k<k_c, the flow
towards low temperature is governed by a Reissner-Nordstrom-like black brane
whose charge and entropy density are non-vanishing at zero temperature. For k >
k_c, the IR flow is towards the purely magnetic brane in AdS_6. Its
near-horizon geometry is AdS_4 \times R^2, so that the entropy density vanishes
quadratically with temperature, and all charge is carried by the gauge fields
outside of the horizon.Comment: 37 pages v2: reference added and cosmetic improvement
The Higgs sector of the phenomenological MSSM in the light of the Higgs
  boson discovery

The long awaited discovery of a new light scalar at the LHC opens up a new
era of studies of the Higgs sector in the SM and its extensions. In this paper
we discuss the consequences of the observation of a light Higgs boson with the
mass and rates reported by the ATLAS and CMS collaborations on the parameter
space of the phenomenological MSSM, including also the so far unsuccessful LHC
searches for the heavier Higgs bosons and supersymmetric particle partners in
missing transverse momentum as well as the constraints from B physics and dark
matter. We explore the various regimes of the MSSM Higgs sector depending on
the parameters MA and tan beta and show that only two of them are still allowed
by all present experimental constraints: the decoupling regime where there is
only one light and standard--like Higgs boson and the supersymmetric regime in
which there are light supersymmetric particle partners affecting the decay
properties of the Higgs boson, in particular its di-photon and invisible
decays.Comment: 21 pages, 9 figures v2 - Discussion of the impact of LHC data
  extended, scan statistics increased, a few figures added and typos correcte
The gluino-glue particle and finite size effects in supersymmetric
  Yang-Mills theory

The spectrum of particles in supersymmetric Yang-Mills theory is expected to
contain a spin 1/2 bound state of gluons and gluinos, the gluino-glue particle.
We study the mass of this particle in softly broken supersymmetric Yang-Mills
theory on a lattice by means of numerical simulations. The main focus is the
estimation of finite size effects. We extrapolate the mass first to the
infinite volume and then to the limit of a vanishing gluino mass. The results
indicate that finite size effects are tolerable on lattices of moderate size,
and that remaining deviations from supersymmetry are probably due to finite
lattice spacing effects
Suppression of high transverse momentum D mesons in central Pb-Pb collisions at psNN = 2.76TeV

The production of the prompt charm mesons D0, D+, D∗+, and their antiparticles, was measured with the ALICE detector in Pb-Pb collisions at the LHC, at a centre-of-mass energy √sNN = 2.76 TeV per nucleon- nucleon collision. The pt-differential production yields in the range 2 &lt; pt &lt; 16 GeV/c at central rapidity, |y| &lt; 0.5, were used to calculate the nuclear modification factor RAA with respect to a proton-proton reference obtained from the cross section measured at √s = 7 TeV and scaled to √s = 2.76 TeV. For the three meson species, RAA shows a suppression by a factor 3–4, for transverse momenta larger than 5 GeV/c in the 20% most central collisions. The suppression is reduced for peripheral collisions
Holographic two-point functions for 4d log-gravity

We compute holographic one- and two-point functions of critical
higher-curvature gravity in four dimensions. The two most important operators
are the stress tensor and its logarithmic partner, sourced by ordinary massless
and by logarithmic non-normalisable gravitons, respectively. In addition, the
logarithmic gravitons source two ordinary operators, one with spin-one and one
with spin-zero. The one-point function of the stress tensor vanishes for all
Einstein solutions, but has a non-zero contribution from logarithmic gravitons.
The two-point functions of all operators match the expectations from a
three-dimensional logarithmic conformal field theory.Comment: 35 pages; v2: typos corrected, added reference; v3: shorter
  introduction, minor changes in the text in section 3, added reference;
  published versio
Abelian Non-Global Logarithms from Soft Gluon Clustering

Most recombination-style jet algorithms cluster soft gluons in a complex way.
This leads to correlations in the soft gluon phase space and introduces
logarithmic corrections to jet cross sections. The leading Abelian clustering
logarithms occur at least at next-to leading logarithm (NLL) in the exponent of
the distribution, and we show that new clustering effects contributing at NLL
likely arise at each order. Therefore we find that it is unlikely that
clustering logs can be resummed to NLL. Clustering logarithms make the anti-kT
algorithm theoretically preferred, for which they are power suppressed. They
can arise in Abelian and non-Abelian terms, and we calculate the Abelian
clustering logarithms at two loops for the jet mass distribution using the
Cambridge/Aachen and kT algorithms, including jet radius dependence, which
extends previous results. We find that previously identified logarithms from
clustering effects can be naturally thought of as a class of non-global
logarithms (NGLs), which have traditionally been tied to non-Abelian
correlations in soft gluon emission.Comment: 22 pages + appendices, 8 figure
Global Analysis of the Higgs Candidate with Mass ~ 125 GeV

We analyze the properties of the Higgs candidate with mass ~ 125 GeV
discovered by the CMS and ATLAS Collaborations, constraining the possible
deviations of its couplings from those of a Standard Model Higgs boson. The
CMS, ATLAS and Tevatron data are compatible with Standard Model couplings to
massive gauge bosons and fermions, and disfavour several types of composite
Higgs models unless their couplings resemble those in the Standard Model. We
show that the couplings of the Higgs candidate are consistent with a linear
dependence on particle masses, scaled by the electroweak scale ~ 246 GeV, the
power law and the mass scale both having uncertainties ~ 20%.Comment: 22 pages, 9 figures, v2 incorporates experimental data released
  during July 2012 and corrected (and improved) treatment of mass dependence of
  coupling
Orthogonal multiplet bases in SU(Nc) color space

We develop a general recipe for constructing orthogonal bases for the
calculation of color structures appearing in QCD for any number of partons and
arbitrary Nc. The bases are constructed using hermitian gluon projectors onto
irreducible subspaces invariant under SU(Nc). Thus, each basis vector is
associated with an irreducible representation of SU(Nc). The resulting
multiplet bases are not only orthogonal, but also minimal for finite Nc. As a
consequence, for calculations involving many colored particles, the number of
basis vectors is reduced significantly compared to standard approaches
employing overcomplete bases. We exemplify the method by constructing multiplet
bases for all processes involving a total of 6 external colored partons.Comment: 50 pages, 2 figure