pinecone/core-2020-05-10-deduplication huggingface dataset:
Quark masses and mixings in the RS1 model with a condensing 4th
  generation

We study the hierarchy of quark masses and mixings in a model based on a
5-dimensional spacetime with constant curvature of Randall-Sundrum type with
two branes, where the Electroweak Symmetry Breaking is caused dynamically by
the condensation of a 4th generation of quarks, due to underlying physics from
the 5D bulk and the first KK gluons. We first study the hierarchy of quark
masses and mixings that can be obtained from purely adjusting the profile
localizations, finding that realistic masses are not reproduced unless non
trivial hierarchies of underlying 4-fermion interactions from the bulk are
included. Then we study global U(1) symmetries that can be imposed in order to
obtain non-symmetric modified Fritzsch-like textures in the mass matrices that
reproduce reasonably well quark masses and CKM mixings.Comment: Minor changes. Version accepted for publication in JHE
Hairy black hole entropy and the role of solitons in three dimensions

Scalar fields minimally coupled to General Relativity in three dimensions are
considered. For certain families of self-interaction potentials, new exact
solutions describing solitons and hairy black holes are found. It is shown that
they fit within a relaxed set of asymptotically AdS boundary conditions, whose
asymptotic symmetry group coincides with the one for pure gravity and its
canonical realization possesses the standard central extension. Solitons are
devoid of integration constants and their (negative) mass, fixed and determined
by nontrivial functions of the self-interaction couplings, is shown to be
bounded from below by the mass of AdS spacetime. Remarkably, assuming that a
soliton corresponds to the ground state of the sector of the theory for which
the scalar field is switched on, the semiclassical entropy of the corresponding
hairy black hole is exactly reproduced from Cardy formula once nonvanishing
lowest eigenvalues of the Virasoro operators are taking into account, being
precisely given by the ones associated to the soliton. This provides further
evidence about the robustness of previous results, for which the ground state
energy instead of the central charge appears to play the leading role in order
to reproduce the hairy black hole entropy from a microscopic counting.Comment: Version accepted for publication in JHE
Universality of Phases in QCD and QCD-like Theories

We argue that the whole or the part of the phase diagrams of QCD and QCD-like
theories should be universal in the large-N_c limit through the orbifold
equivalence. The whole phase diagrams, including the chiral phase transitions
and the BEC-BCS crossover regions, are identical between SU(N_c) QCD at finite
isospin chemical potential and SO(2N_c) and Sp(2N_c) gauge theories at finite
baryon chemical potential. Outside the BEC-BCS crossover region in these
theories, the phase diagrams are also identical to that of SU(N_c) QCD at
finite baryon chemical potential. We give examples of the universality in some
solvable cases: (i) QCD and QCD-like theories at asymptotically high density
where the controlled weak-coupling calculations are possible, (ii) chiral
random matrix theories of different universality classes, which are solvable
large-N (large volume) matrix models of QCD. Our results strongly suggest that
the chiral phase transition and the QCD critical point at finite baryon
chemical potential can be studied using sign-free theories, such as QCD at
finite isospin chemical potential, in lattice simulations.Comment: v1: 35 pages, 6 figures; v2: 37 pages, 6 figures, minor improvements,
  conclusion unchanged; v3: version published in JHE
Real-virtual corrections for gluon scattering at NNLO.

We use the antenna subtraction method to isolate the mixed real-virtual infrared singularities present in gluonic scattering amplitudes at next-to-next-to-leading order. In a previous paper, we derived the subtraction term that rendered the double real radiation tree-level process finite in the single and double unresolved regions of phase space. Here, we show how to construct the real-virtual subtraction term using antenna functions with both initial- and final-state partons which removes the explicit infrared poles present in the one-loop amplitude, as well as the implicit singularities that occur in the soft and collinear limits. As an explicit example, we write down the subtraction term that describes the single unresolved contributions from the five-gluon one-loop process. The infrared poles are explicitly and locally cancelled in all regions of phase space prior to integration, leaving a finite remainder that can be safely evaluated numerically in four-dimensions. We show numerically that the subtraction term correctly approximates the matrix elements in the various single unresolved configurations
Subluminal Galilean Genesis

We put forward an improved version of the Galilean Genesis model that
addresses the problem of superluminality. We demote the full conformal group to
Poincare symmetry plus dilations, supplemented with approximate galilean shift
invariance in the UV and at small field values. In this way fluctuations around
the NEC-violating cosmological background are made substantially subluminal,
and superluminality cannot be reached by any small change of the solution, in
contrast with the original model. Dilation invariance still protects the
scale-invariance of correlation functions of a massless test scalar - which is
the source of the observed cosmological fluctuations - but the explicit
breaking of the conformal group can be potentially observed in higher-order
correlators. We also highlight a subtlety in matching the NEC-violating phase
with the standard cosmological evolution, and discuss the possible couplings of
the Galileon to gravity.Comment: 18 pages, 1 figur
Resummation of rapidity logarithms in $B$ meson wave functions

We construct an evolution equation for the $B$ meson wave functions in the
$k_T$ factorization theorem, whose solutions sum the double logarithms
associated with the light-cone singularities, namely, the rapidity logarithms.
The derivation is subtler than that of the Sudakov resummation for an energetic
light hadron, due to the involvement of the effective heavy-quark field. The
renormalization-group evolution in the factorization scale needs to be included
in order to derive an ultraviolet-finite and scale-invariant kernel for
resumming the rapidity logarithms. It is observed that this kernel is similar
to that of the joint resummation for QCD processes in extreme kinematic
regions, which combines the threshold and $k_T$ resummations. We show that the
resummation effect maintains the normalization of the $B$ meson wave functions,
and strengths their convergent behavior at small spectator momentum. The
resummation improved $B$ meson wave functions are then employed in the
leading-order analysis of the $B\to\pi$ transition form factors, which lead to
approximately 25% deduction in the large recoil region.Comment: 12 pages, 4 figures, accepted for publication in JHE
Isolated prompt photon pair production at hadron colliders with
  kt-factorization

In the framework of the kt-factorization approach, the isolated prompt photon
pair production in pp and p \bar p collisions at high energies is studied. The
consideration is based on the quark-antiquark annihilation, quark-gluon
scattering and gluon-gluon fusion subprocesses, where the non-zero transverse
momenta of incoming partons are taken into account. The unintegrated quark and
gluon densities in a proton are determined using the Kimber-Martin-Ryskin
prescription. The numerical analysis covers the total and differential
production cross sections and extends to specific angular correlations between
the produced prompt photons. Theoretical uncertainties of our evaluations are
studied and comparison with the NLO pQCD calculations is performed. The
numerical predictions are compared with the recent experimental data taken by
the D0, CDF, CMS and ATLAS collaborations at the Tevatron and LHC energies.Comment: 30 pages, 15 figures, 3 table
Boosted black string bombs

We study the formation of superradiant bound states for massive scalar fields
in five-dimensional rotating black string geometries with a non-vanishing
Kaluza-Klein momentum along the compact direction. Even though all Kaluza-Klein
modes may form bound states in this geometry, in realistic extra-dimensional
models and astrophysical black holes only the zero-mode is sufficiently light
for superradiant instabilities to develop, provided the field has a small but
non-vanishing mass, as for example for axion-like particles. We use analytical
and numerical methods to show that, although the Kaluza-Klein momentum
decreases the upper bound on the field mass for an instability to develop, it
may enhance its maximum growth rate by more than 50%, thus boosting the black
hole bomb mechanism. We discuss the possible observational consequences of this
result and its potential as an astrophysical probe of non-trivial
extra-dimensional compactifications.Comment: 15 pages, 6 figures; revised version published in JHE
Construction of New D=3, N=4 Quiver Gauge Theories

In this paper we propose a special class of 3-algebras, called
double-symplectic 3-algebras. We further show that a consistent contraction of
the double-symplectic 3-algebra gives a new 3-algebra, called an N=4
three-algebra, which is then identified as the exact gauged three-algebra in
the N=4 quiver gauge theories. A systematic construction is proposed for the
3-brackets and fundamental identities used in building up the N=4 theories, by
starting with two superalgebras whose bosonic parts share at least one simple
factor or U(1) factor. This leads to a systematic way of constructing D=3, N=4
quiver theories, of which several examples with new gauge groups are presented
in detail. The general N=4 superconformal Chern-Simons matter theories in terms
of ordinary Lie algebras can be also re-derived in our new 3-algebra approach.Comment: 35 pages, minor changes, version published in JHE
Superpotential de-sequestering in string models

Non-perturbative superpotential cross-couplings between visible sector matter
and K\"ahler moduli can lead to significant flavour-changing neutral currents
in compactifications of type IIB string theory. Here, we compute corrections to
Yukawa couplings in orbifold models with chiral matter localised on D3-branes
and non-perturbative effects on distant D7-branes. By evaluating a threshold
correction to the D7-brane gauge coupling, we determine conditions under which
the non-perturbative corrections to the Yukawa couplings appear. The flavour
structure of the induced Yukawa coupling generically fails to be aligned with
the tree-flavour structure. We check our results by also evaluating a
correlation function of two D7-brane gauginos and a D3-brane Yukawa coupling.
Finally, by calculating a string amplitude between n hidden scalars and visible
matter we show how non-vanishing vacuum expectation values of distant D7-brane
scalars, if present, may correct visible Yukawa couplings with a flavour
structure that differs from the tree-level flavour structure.Comment: 37 pages + appendices, 8 figure
N=1 supersymmetric higher spin holography on AdS_3

We propose a duality between a higher spin N=1 supergravity on AdS_3 and a
large N limit of a family of N=(1,1) superconformal field theories. The gravity
theory is an N=1 truncation of the N=2 supergravity found by Prokushkin and
Vasiliev, and the dual conformal field theory is defined by a supersymmetric
coset model. We check this conjecture by comparing one loop partition functions
and find agreement. Moreover, we study the symmetry of the dual coset model and
in particular compute fields of the coset algebra of dimension 3/2, 2, 2 and
5/2 explicitely.Comment: 31 pages, 1 figur
Scalar Resonances in the Non-linearly Realized Electroweak Theory

We introduce a physical scalar sector in a SU(2)xU(1) electroweak theory in
which the gauge group is realized non linearly. By invoking theoretical as well
as experimental constraints, we build a phenomenologically viable model in
which a minimum of four scalar resonances appear, and the mass of the CP even
scalar is controlled by a vacuum expectation value; however, the masses of all
other particles (both matter as well as vector boson fields) are unrelated to
spontaneous symmetry breaking and generated by the St\"uckelberg mechanism. We
evaluate in this model the CP-even scalar decay rate to two photons and use
this amplitude to perform a preliminary comparison with the recent LHC
measurements. As a result, we find that the model exhibits a preference for a
negative Yukawa coupling between the top quark and the CP-even resonance.Comment: 21 pages, 3 figures; typos correcte
Multiple CP non-conserving mechanisms of (ββ)0ν -decay and nuclei with largely different nuclear matrix elements

We investigate the possibility to discriminate between different pairs of CP non-conserving mechanisms inducing the neutrinoless double beta (ββ)0ν -decay by using data on (ββ) 0ν -decay half-lives of nuclei with largely different nuclear matrix elements (NMEs). The mechanisms studied are: light Majorana neutrino exchange, heavy left-handed (LH) and heavy right-handed (RH) Majorana neutrino exchanges, lepton charge non-conserving couplings in SUSY theories with R-parity breaking giving rise to the "dominant gluino exchange" and the "squark-neutrino" mechanisms. The nuclei considered are 76Ge, 82Se, 100Mo, 130Te and 136Xe. Four sets of nuclear matrix elements (NMEs) of the decays of these five nuclei, derived within the Self-consistent Renormalized Quasiparticle Random Phase Approximation (SRQRPA), were employed in our analysis. While for each of the five single mechanisms discussed, the NMEs for 76Ge, 82Se, 100Mo and 130Te differ relatively little, the relative difference between the NMEs of any two nuclei not exceeding 10%, the NMEs for 136 Xe differ significantly from those of 76Ge, 82 Se, 100Mo and 130Te, being by a factor ~ (1.3 - 2.5) smaller. This allows, in principle, to draw conclusions about the pair of non-interfering (interfering) mechanisms possibly inducing the (ββ)0ν -decay from data on the half-lives of 136 Xe and of at least one (two) more isotope(s) which can be, e.g., any of the four, 76 Ge, 82 Se, 100 Mo and 130 Te. Depending on the sets of mechanisms considered, the conclusion can be independent of, or can depend on, the NMEs used in the analysis. The implications of the EXO lower bound on the half-life of 136 Xe for the problem studied are also exploited. © 2013 SISSA, Trieste, Italy
Chern-Simons EM-flation

We propose a new, generic mechanism of inflation mediated by a balance
between potential forces and a Chern-Simons interaction. Such quasi-topological
interactions are ubiquitous in string theory. In the minisuperspace
approximation, their effect on the dynamics can be mapped onto the problem of a
charged particle in an electromagnetic field together with an external
potential; slow roll arises when the motion is dominated by the analogue of
`magnetic drift'. This mechanism is robust against radiative corrections. We
suggest a possible experimental signature which, if observed, might be
considered strong evidence for string theory.Comment: 30 pages, no figures. v2: several errors correcte
Natural Islands for a 125 GeV Higgs in the scale-invariant NMSSM

We study whether a 125 GeV standard model-like Higgs boson can be
accommodated within the scale-invariant NMSSM in a way that is natural in all
respects, i.e., not only is the stop mass and hence its loop contribution to
Higgs mass of natural size, but we do not allow significant tuning of NMSSM
parameters as well. We pursue as much as possible an analytic approach which
gives clear insights on various ways to accommodate such a Higgs mass, while
conducting complementary numerical analyses. We consider both scenarios with
singlet-like state being heavier and lighter than SM-like Higgs. With A-terms
being small, we find for the NMSSM to be perturbative up to GUT scale, it is
not possible to get 125 GeV Higgs mass, which is true even if we tune
parameters of NMSSM. If we allow some of the couplings to become
non-perturbative below the GUT scale, then the non-tuned option implies that
the singlet self-coupling, kappa, is larger than the singlet-Higgs coupling,
lambda, which itself is order 1. This leads to a Landau pole for these
couplings close to the weak scale, in particular below ~10^4 TeV. In both the
perturbative and non-perturbative NMSSM, allowing large A_lambda, A_kappa gives
"more room" to accommodate a 125 GeV Higgs, but a tuning of these A-terms may
be needed. In our analysis we also conduct a careful study of the constraints
on the parameter space from requiring global stability of the desired vacuum
fitting a 125 GeV Higgs, which is complementary to existing literature. In
particular, as the singlet-Higgs coupling lambda increases, vacuum stability
becomes more serious of an issue.Comment: 34 pages, 4 figures, references added, minor corrections to text and
  figures, version to be published in JHE
Multi-Lepton Signals of Multiple Higgs Bosons

We identify and investigate novel multi-lepton signatures of extended Higgs
sectors at the LHC in the guise of CP- and flavor-conserving two-Higgs-doublet
models (2HDMs). Rather than designing individual searches tailored to specific
2HDM signals, we employ the combination of many exclusive multi-lepton search
channels to probe the collective signal from the totality of production and
decay processes. Multi-lepton signals of 2HDMs can arise from a variety of
sources, including Standard Model-like production of the CP-even scalars, $h$
and $H$, through gluon-fusion with $h,H \to ZZ^{(*)}$, or associated production
with vector bosons or top quarks, with $h,H \to WW^{(*)}, ZZ^{(*)},\tau\tau$.
Additional sources include gluon-fusion production of the heavy CP-even scalar
with decays through the light CP-even scalar, the CP-odd scalar, $A$, or the
charged scalar, $H^\pm$, such as $H \to hh$, $H \to AA$, $H \to H^+ H^-$, $H
\to ZA$, with $A \to Zh, \tau\tau$, $H^\pm \to Wh$, and $h \to WW^*,
ZZ^*,\tau\tau$. Altogether, the combined multi-lepton signal may greatly exceed
that of the Standard Model Higgs boson and provides a sensitive probe of
extended Higgs sectors. As a proof of principle, we use a factorized mapping
procedure between model parameters and signatures to determine multi-lepton
sensitivities in four different flavor conserving 2HDM parameter spaces by
simulating the acceptance times efficiency in 20 exclusive multi-lepton
channels for 222 independent production and decay topologies that arise for
four benchmark 2HDM spectra within each parameter space. A comparison of these
sensitivities with the results of a multi-lepton search conducted by the CMS
collaboration using 5 fb$^{-1}$ of data collected from 7 TeV $pp$ collisions
yields new limits in regions of 2HDM parameter space that have not previously
been covered by other types of direct experimental searches.Comment: 39 pages, 11 tables, 11 figure
Even tiers and resonances on the Real Projective Plane

In this work we focus on various phenomenological aspects of the lightest
even tiers, (2,0) and (0,2), in models based on a Real Projective Plane in 6
dimensions. We discuss the spectrum of the levels due to loop corrections, and
the limit when the two radii are equal, in which case the two levels mix with
each other and a new basis is defined. We also discuss the dependence of the
spectrum on the ratio of the two radii. These results are essential to
understand the phenomenology of the model at colliders (LHC) and to predict the
relic abundance of Dark Matter. Finally, we estimate the bounds on the radius
from resonant decays of the even tiers at the LHC, showing that they can be in
the 600 GeV range after the complete analysis of the 2011 data.Comment: 43 pages, 10 figure
The treatment of the infrared region in perturbative QCD

We discuss the contribution coming from the infrared region to NLO matrix
elements and/or coefficient functions of hard QCD processes. Strictly speaking,
this contribution is not known theoretically, since it is beyond perturbative
QCD. For DGLAP evolution all the infrared contributions are collected in the
phenomenological input parton distribution functions (PDFs), at some relatively
low scale Q_0; functions which are obtained from a fit to the `global' data.
However dimensional regularization sometimes produces a non-zero result coming
from the infrared region. Instead of this conventional regularization
treatment, we argue that the proper procedure is to first subtract from the NLO
matrix element the contribution already generated at the same order in \alpha_s
by the LO DGLAP splitting function convoluted with the LO matrix element. This
prescription eliminates the logarithmic infrared divergence, giving a
well-defined result which is consistent with the original idea that everything
below Q_0 is collected in the PDF input. We quantify the difference between the
proposed treatment and the conventional approach using low-mass Drell-Yan
production and deep inelastic electron-proton scattering as examples; and
discuss the potential impact on the `global' PDF analyses. We present arguments
to show that the difference cannot be regarded as simply the use of an
alternative factorization scheme.Comment: 15 pages, 5 figures, title changed, text considerably modified to
  improve presentation, and discussion section enlarge
Singularities in K-space and Multi-brane Solutions in Cubic String Field
  Theory

In a previous paper [arXiv:1111.2389], we studied the multi-brane solutions
in cubic string field theory by focusing on the topological nature of the
"winding number" N which counts the number of branes. We found that N can be
non-trivial owing to the singularity from the zero-eigenvalue of K of the KBc
algebra, and that solutions carrying integer N and satisfying the EOM in the
strong sense is possible only for N=0,\pm 1. In this paper, we extend the
construction of multi-brane solutions to |N|\ge 2. The solutions with N=\pm 2
is made possible by the fact that the correlator is invariant under a
transformation exchanging K with 1/K and hence K=\infty eigenvalue plays the
same role as K=0. We further propose a method of constructing solutions with
|N|\ge 3 by expressing the eigenvalue space of K as a sum of intervals where
the construction for |N|\le 2 is applicable.Comment: 20 pages, no figures, v4: version published in JHE
Null-polygonal minimal surfaces in AdS4 from perturbed W minimal models

We study the null-polygonal minimal surfaces in AdS4, which correspond to the gluon scattering amplitudes/Wilson loops in N = 4 super Yang-Mills theory at strong coupling. The area of the minimal surfaces with n cusps is characterized by the thermodynamic Bethe ansatz (TBA) integral equations or the Y-system of the homogeneous sine-Gordon model, which is regarded as the SU(n − 4)4 /U(1) n−5 generalized parafermion theory perturbed by the weight-zero adjoint operators. Based on the relation to the TBA systems of the perturbed W minimal models, we solve the TBA equations by using the conformal perturbation theory, and obtain the analytic expansion of the remainder function around the UV/regular-polygonal limit for n = 6 and 7. We compare the rescaled remainder function for n = 6 with the two-loop one, to observe that they are close to each other similarly to the AdS3 case