pinecone/core-2020-05-10-deduplication huggingface dataset:
Let there be light from a second light Higgs doublet

In this article, we demonstrate that the unexpected peak at around $95 \,
{\rm GeV}$ as seen recently by CMS in the di-photon final state can be
explained within the type-I~two-Higgs-doublet model by means of a
moderately-to-strongly fermiophobic CP-even Higgs $H$. Depending on the Higgs
mass spectrum, the production of such~a~$H$ arises dominantly from vector boson
fusion or through a cascade in either $pp \to t \bar t$ with $\overset{(-)}{t}
\to H^{\pm} \overset{(-)}{b} \to W^{\pm \, \ast} H \overset{(-)}{b}$ or $pp \to
A$ with $A \to W^{\mp} H^{\pm} \to W^{\mp} W^{\pm} H$ or via $pp \to W^{\pm \,
\ast} \to H^\pm H$. In this context, we also discuss other Higgs anomalies such
as the LEP excess in Higgsstrahlung and the observation of enhanced rates in $t
\bar t h$ at both the Tevatron and the LHC, showing that parameters capable of
explaining the CMS di-photon signal can address the latter deviations as well.
The Higgs spectra that we explore comprise masses between $80 \, {\rm GeV}$ and
$350\, {\rm GeV}$. While at present all constraints from direct and indirect
searches for spin-0 resonances can be shown to be satisfied for such light
Higgses, future LHC data will be able to probe the parameter space that leads
to a simultaneous explanation of the discussed anomalies.Comment: 21 pages, 14 figures; v3: matches version published in JHE
On the On-Shell: The Action of AdS$_4$ Black Holes

We compute the on-shell action of static, BPS black holes in AdS$_4$ from
${\cal N}=2$ gauged supergravity coupled to vector multiplets and show that it
is equal to minus the entropy of the black hole. Holographic renormalization is
used to demonstrate that with appropriate boundary conditions on the scalar
fields, the divergent and finite contributions from the asymptotic boundary
vanish. The entropy arises from the extrinsic curvature on $\Sigma_g\times S^1$
evaluated at the horizon, where $\Sigma_g$ may have any genus $g\geq 0$. This
provides a clarification of the equivalence between the partition function of
the twisted ABJM theory on $\Sigma_g\times S^1$ and the entropy of the dual
black hole solutions. It also demonstrates that the complete entropy resides on
the AdS$_2\times \Sigma_g$ horizon geometry, implying the absence of hair for
these gravity solutions.Comment: 16 pages, v2 minor corrections references adde
Lepton mixing and the charged-lepton mass ratios

We construct a class of renormalizable models for lepton mixing that generate
predictions given in terms of the charged-lepton mass ratios. We show that one
of those models leads, when one takes into account the known experimental
values, to almost maximal CP-breaking phases and to almost maximal neutrinoless
double-beta decay. We study in detail the scalar potential of the models,
especially the bounds imposed by unitarity on the values of the quartic
couplings.Comment: 39 pages, 9 figures; revised version addressed the criticism of the
  editor, matches now the published versio
FRW and domain walls in higher spin gravity

We present exact solutions to Vasiliev's bosonic higher spin gravity
equations in four dimensions with positive and negative cosmological constant
that admit an interpretation in terms of domain walls, quasi-instantons and
Friedman-Robertson-Walker (FRW) backgrounds. Their isometry algebras are
infinite dimensional higher-spin extensions of spacetime isometries generated
by six Killing vectors. The solutions presented are obtained by using a method
of holomorphic factorization in noncommutative twistor space and gauge
functions. In interpreting the solutions in terms of Fronsdal-type fields in
spacetime, a field-dependent higher spin transformation is required, which is
implemented at leading order. To this order, the scalar field solves
Klein-Gordon equation with conformal mass in (anti) de Sitter space. We
interpret the FRW solution with de Sitter asymptotics in the context of
inflationary cosmology and we expect that the domain wall and FRW solutions are
associated with spontaneously broken scaling symmetries in their holographic
description. We observe that the factorization method provides a convenient
framework for setting up a perturbation theory around the exact solutions, and
we propose that the nonlinear completion of particle excitations over FRW and
domain wall solutions requires black hole-like states.Comment: 63 page
$N=2$ dilaton Weyl multiplet in 4D supergravity

We construct the dilaton Weyl multiplet for $N=2$ conformal supergravity in
four dimensions. Beginning from an on-shell vector multiplet coupled to the
standard Weyl multiplet, the equations of motion can be used to eliminate the
supergravity auxiliary fields, following a similar pattern as in five and six
dimensions. The resulting 24+24 component multiplet includes two gauge vectors
and a gauge two-form and provides a variant formulation of $N=2$ conformal
supergravity. We also show how this dilaton Weyl multiplet is contained in the
minimal 32+32 Poincare supergravity multiplet introduced by Muller in
superspace.Comment: 15 page
Topological Strings on Singular Elliptic Calabi-Yau 3-folds and Minimal
  6d SCFTs

We apply the modular approach to computing the topological string partition
function on non-compact elliptically fibered Calabi-Yau 3-folds with higher
Kodaira singularities in the fiber. The approach consists in making an ansatz
for the partition function at given base degree, exact in all fiber classes to
arbitrary order and to all genus, in terms of a rational function of weak
Jacobi forms. Our results yield, at given base degree, the elliptic genus of
the corresponding non-critical 6d string, and thus the associated BPS
invariants of the 6d theory. The required elliptic indices are determined from
the chiral anomaly 4-form of the 2d worldsheet theories, or the 8-form of the
corresponding 6d theories, and completely fix the holomorphic anomaly equation
constraining the partition function. We introduce subrings of the known rings
of Weyl invariant Jacobi forms which are adapted to the additional symmetries
of the partition function, making its computation feasible to low base wrapping
number. In contradistinction to the case of simpler singularities, generic
vanishing conditions on BPS numbers are no longer sufficient to fix the modular
ansatz at arbitrary base wrapping degree. We show that to low degree, imposing
exact vanishing conditions does suffice, and conjecture this to be the case
generally.Comment: 67 pages; v2 typos corrected, references adde
Time-Dependent Observables in Heavy Ion Collisions II: in Search of
  Pressure Isotropization in the $\varphi^4$ Theory

To understand the dynamics of thermalization in heavy ion collisions in the
perturbative framework it is essential to first find corrections to the
free-streaming classical gluon fields of the McLerran-Venugopalan model. The
corrections that lead to deviations from free streaming (and that dominate at
late proper time) would provide evidence for the onset of isotropization (and,
possibly, thermalization) of the produced medium. To find such corrections we
calculate the late-time two-point Green function and the energy-momentum tensor
due to a single $2 \to 2$ scattering process involving two classical fields. To
make the calculation tractable we employ the scalar $\varphi^4$ theory instead
of QCD. We compare our exact diagrammatic results for these quantities to those
in kinetic theory and find disagreement between the two. The disagreement is in
the dependence on the proper time $\tau$ and, for the case of the two-point
function, is also in the dependence on the space-time rapidity $\eta$: the
exact diagrammatic calculation is, in fact, consistent with the free streaming
scenario. Kinetic theory predicts a build-up of longitudinal pressure, which,
however, is not observed in the exact calculation. We conclude that we find no
evidence for the beginning of the transition from the free-streaming classical
fields to the kinetic theory description of the produced matter after a single
$2 \to 2$ rescattering.Comment: 46 pages, 9 figure
Time-Dependent Observables in Heavy Ion Collisions I: Setting up the
  Formalism

We adapt the Schwinger-Keldysh formalism to study heavy-ion collisions in
perturbative QCD. Employing the formalism, we calculate the two-point gluon
correlation function $G_{22}^{a\mu,b\nu}$ due to the lowest-order classical
gluon fields in the McLerran-Venugopalan model of heavy ion collisions and
observe an interesting transition from the classical fields to the
quasi-particle picture at later times. Motivated by this observation, we push
the formalism to higher orders in the coupling and calculate the contribution
to $G_{22}^{a\mu,b\nu}$ coming from the diagrams representing a single
rescattering between two of the produced gluons. We assume that the two gluons
go on mass shell both before and after the rescattering. The result of our
calculation depends on the ordering between the proper time of the rescattering
$\tau_Z$ and the proper time $\tau$ when the gluon distribution is measured.
For (i) $\tau_Z\gg 1/Q_s$ and $\tau-\tau_Z\gg 1/Q_s$ (with $Q_s$ the saturation
scale) we obtain the same results as from the Boltzmann equation. For (ii)
$\tau-\tau_Z\gg \tau_Z\gg 1/Q_s$ we end up with a result very different from
kinetic theory and consistent with a picture of "free-streaming" particles. Due
to the approximations made, our calculation is too coarse to indicate whether
the ordering (i) or (ii) is the correct one: to resolve this controversy, we
shall present a detailed diagrammatic calculation of the rescattering
correction in the $\varphi^4$ theory in the second paper of this duplex.Comment: 45 pages, 9 figure
Observation of deconfinement in a cold dense quark medium

In this paper we study the confinement/deconfinement transition in lattice
$SU(2)$ QCD at finite quark density and zero temperature. The simulations are
performed on an $32^4$ lattice with rooted staggered fermions at a lattice
spacing $a = 0.044 \mathrm{~fm}$. This small lattice spacing allowed us to
reach very large baryon density (up to quark chemical potential $\mu_q > 2000
\mathrm{~MeV}$) avoiding strong lattice artifacts. In the region $\mu_q\sim
1000 \mathrm{~MeV}$ we observe for the first time the confinement/deconfinement
transition which manifests itself in rising of the Polyakov loop and vanishing
of the string tension $\sigma$. After the deconfinement is achieved at $\mu_q >
1000 \mathrm{~MeV}$, we observe a monotonous decrease of the spatial string
tension $\sigma_s$ which ends up with $\sigma_s$ vanishing at $\mu_q > 2000
\mathrm{~MeV}$. From this observation we draw the conclusion that the
confinement/deconfinement transition at finite density and zero temperature is
quite different from that at finite temperature and zero density. Our results
indicate that in very dense matter the quark-gluon plasma is in essence a
weakly interacting gas of quarks and gluons without a magnetic screening mass
in the system, sharply different from a quark-gluon plasma at large
temperature.Comment: 6 pages, 4 figure
3d N=4 super-Yang-Mills on a lattice.

In this paper we explore a new approach to studying three-dimensional   N=4  super-Yang-Mills on a lattice. Our strategy is to complexify the Donaldson-Witten twist of four-dimensional   N=2  super-Yang-Mills to make it amenable to a lattice formulation and we find that lattice gauge invariance forces the model to live in at most three dimensions. We analyze the renormalization of the lattice theory and show that uncomplexified three-dimensional   N=4 super-Yang-Mills can be reached in the continuum limit by supplementing the lattice action with appropriate mass terms
Classifying Global Symmetries of 6D SCFTs

We characterize the global symmetries for the conjecturally complete
collection of six dimensional superconformal field theories (6D SCFTs) which
are realizable in F-theory and have no frozen singularities. We provide
comprehensive checks of earlier 6D SCFT classification results via an
alternative geometric approach yielding new restrictions which eliminate
certain theories. We achieve this by directly constraining elliptically fibered
Calabi-Yau (CY) threefold Weierstrass models. This allows bypassing all anomaly
cancellation machinery and reduces the problem of classifying the 6D SCFT gauge
and global symmetries realizable in F-theory models before RG-flow to
characterizing features of associated elliptic fibrations involving analysis of
polynomials determining their local models. We supply an algorithm with
implementation producing from a given SCFT base an explicit listing of all
compatible gauge enhancements and their associated global symmetry maxima
consistent with these geometric constraints making explicit the possible
Kodaira type realizations of each algebra summand. In mathematical terms, this
amounts to determining all potentially viable non-compact CY threefold elliptic
fibrations at finite distance in the moduli space with Weil-Petersson metric
meeting certain requirements including transverse pairwise intersection of
singular locus components. We provide local analysis exhausting nearly all CY
consistent transverse singular fiber collisions, global analysis treating all
viable gluings of these local models into larger configurations, and many novel
constraints on singular locus component pair intersections and global fiber
arrangements. We also investigate which transitions between 6D SCFTs can result
from gauging of global symmetries and find that continuous degrees of freedom
can be lost during such transitions.Comment: 90 pages, ancillary files include code implementation, matches
  published version and previous version up to minor arXiv abstract edit
Connecting Holographic Wess--Zumino Consistency Conditions to the
  Holographic Anomaly

The Holographic Wess--Zumino (HWZ) consistency conditions are shown through a
step by step mapping of renormalization group flows to Hamiltonian systems, to
lead to the Holographic anomaly. These conditions codify how the energy scale,
when treated as the emergent bulk direction in Holographic theories, is put on
equal footing as the other directions of the space the field theory inhabits.
So, this is a defining feature of theories possessing local Holographic bulk
duals. In four dimensional Holographic conformal field theories, the $a$ and
$c$ anomaly coefficients are equated, and this is seen as a defining property
of theories which possess General Relativity coupled to matter as a dual.
Hence, showing how the former consistency conditions leads to the latter
relation between anomaly coefficients adds evidence to the claim that the HWZ
conditions are a defining feature of theories possessing local gravity duals.Comment: 21 pages, no figures, minor typos corrected, references added,
  various sections expanded to make certain arguments cleare
Measurement of differential cross sections in the kinematic angular
  variable $\phi^*$ for inclusive Z boson production in pp collisions at
  $\sqrt{s}=$ 8 TeV

Measurements of differential cross sections d$\sigma$/d$\phi^*$ and
double-differential cross sections d$^2\sigma$/d$\phi^*\,$d$|y|$ for inclusive
Z boson production are presented using the dielectron and dimuon final states.
The kinematic observable $\phi^*$ correlates with the dilepton transverse
momentum but has better resolution, and $y$ is the dilepton rapidity. The
analysis is based on data collected with the CMS experiment at a centre-of-mass
energy of 8 TeV corresponding to an integrated luminosity of 19.7 fb$^{-1}$.
The normalised cross section (1/$\sigma$)$\,$d$\sigma$/d$\phi^*$, within the
fiducial kinematic region, is measured with a precision of better than 0.5% for
$\phi^*$ < 1. The measurements are compared to theoretical predictions and they
agree, typically, within few percent.Comment: Replaced with the published version. Added the journal reference and
  the DOI. All the figures and tables can be found at
  http://cms-results.web.cern.ch/cms-results/public-results/publications/SMP-17-002
  (CMS Public Pages)
Neutrino Mass Generation at TeV Scale and New Physics Signatures from
  Charged Higgs at the LHC for Photon Initiated Processes

We consider the collider phenomenology of a simple extension of the Standard
Model (SM), which consists of an EW isospin $3/2$ scalar, $\Delta$ and a pair
of EW isospin $1$ vector like fermions, $\Sigma$ and $\bar{\Sigma}$,
responsible for generating tiny neutrino mass via the effective dimension seven
operator. This scalar quadruplet with hypercharge Y = 3 has a plethora of
implications at the collider experiments. Its signatures at TeV scale colliders
are expected to be seen, if the quadruplet masses are not too far above the
electroweak symmetry breaking scale. In this article, we study the
phenomenology of multi-charged quadruplet scalars. In particular, we study the
multi-lepton signatures at the Large Hadron Collider (LHC) experiment, arising
from the production and decays of triply and doubly charged scalars. We studied
Drell-Yan (DY) pair production as well as pair production of the charged
scalars via photon-photon fusion. For doubly and triply charged scalars, photon
fusion contributes significantly for large scalar masses. We also studied LHC
constraints on the masses of doubly charged scalars in this model. We derive a
lower mass limit of 725 GeV on doubly charged quadruplet scalar.Comment: 31 pages, 22 figures, published version in JHE
Fully-differential Top-Pair Production at a Lepton Collider: From
  Threshold to Continuum

We present an approach to predict exclusive $W^+bW^-\bar{b}$ production at
lepton colliders that correctly describes the top-anti-top threshold as well as
the continuum region. We incorporate $t\bar{t}$ form factors for the NLL
threshold resummation derived in NRQCD into a factorized relativistic cross
section using an extended double-pole approximation, which accounts for
fixed-order QCD corrections to the top decays at NLO. This is combined with the
full fixed-order QCD result at NLO for $W^+bW^-\bar{b}$ production to obtain
predictions that are not only valid at threshold but smoothly transition to the
continuum region. Our implementation is based on the Monte Carlo event
generator WHIZARD and the code TOPPIK and allows to compute fully-differential
threshold-resummed cross sections including the interference with non-resonant
background processes. For the first time it is now possible to systematically
study general differential observables at future lepton colliders involving the
decay products of the top quarks at energies close to the pair production
threshold and beyond.Comment: 78 pages, 28 figure
Coherence effects in disordered geometries with a field-theory dual

We investigate the holographic dual of a probe scalar in an asymptotically
Anti-de-Sitter (AdS) disordered background which is an exact solution of
Einstein's equations in three bulk dimensions. Unlike other approaches to model
disorder in holography, we are able to explore quantum wave-like interference
effects between an oscillating or random source and the geometry. In the
weak-disorder limit, we compute analytically and numerically the one-point
correlation function of the dual field theory for different choices of sources
and backgrounds. The most interesting feature is the suppression of the
one-point function in the presence of an oscillating source and weak random
background. We have also computed analytically and numerically the two-point
function in the weak disorder limit. We have found that, in general, the
perturbative contribution induces an additional power-law decay whose exponent
depends on the distribution of disorder. For certain choices of the gravity
background, this contribution becomes dominant for large separations which
indicates breaking of perturbation theory and the possible existence of a phase
transition induced by disorder.Comment: 36 pages, 19 figs, v3 accepted versio
Fermionic one-loop amplitudes of the RNS superstring

We investigate massless n-point one-loop amplitudes of the open RNS
superstring with two external fermions and determine their worldsheet
integrands. The contributing correlation functions involving spin-1/2 and
spin-3/2 operators from the fermion vertices are evaluated to any multiplicity.
Moreover, we introduce techniques to sum these correlators over the spin
structures of the worldsheet fermions such as to manifest all cancellations due
to spacetime supersymmetry. These spin sums require generalizations of the
Riemann identities among Jacobi theta functions, and the results can be
expressed in terms of doubly-periodic functions known from the mathematics
literature on elliptic multiple zeta values. On the boundary of moduli space,
our spin-summed correlators specialize to compact representations of fermionic
one-loop integrands for ambitwistor strings.Comment: 42+24 pages, v2: published version, minor corrections in (4.5), (4.8)
  and (4.15
$(q,t)$-KZ equations for quantum toroidal algebra and Nekrasov partition
  functions on ALE spaces

We describe the general strategy for lifting the Wess-Zumino-Witten model
from the level of one-loop Kac-Moody $U_q(\widehat{\mathfrak{g}})_k$ to generic
quantum toroidal algebras. A nearly exhaustive presentation is given for the
two series $U_{q,t}(\widehat{\widehat{\mathfrak{gl}}}_1)$ and
$U_{q,t}(\widehat{\widehat{\mathfrak{gl}}}_n)$, when screenings do not exist
and thus all the correlators are purely algebraic, i.e. do not include
additional hypergeometric type integrations/summations. Generalizing the
construction of the intertwiner (refined topological vertex) of the
Ding-Iohara-Miki (DIM) algebra, we obtain the intertwining operators of the
Fock representations of the quantum toroidal algebra of type $A_n$. The
correlation functions of these operators satisfy the
$(q,t)$-Knizhnik-Zamolodchikov (KZ) equation, which features the ${\cal
R}$-matrix. Matching with the Nekrasov function for the instanton counting on
the ALE space is worked out explicitly. We also present an important
application of the DIM formalism to the study of $6d$ gauge theories described
by the double elliptic integrable systems. We show that the modular and
periodicity properties of the gauge theories are neatly explained by the
network matrix models providing solutions to the elliptic $(q,t)$-KZ equations.Comment: 56 page
On the prevalence of elliptic and genus one fibrations among toric hypersurface Calabi-Yau threefolds

We systematically analyze the fibration structure of toric hypersurface Calabi-Yau threefolds with large and small Hodge numbers. We show that there are only four such Calabi-Yau threefolds with h1,1 ≥ 140 or h2,1 ≥ 140 that do not have manifest elliptic or genus one fibers arising from a fibration of the associated 4D polytope. There is a genus one fibration whenever either Hodge number is 150 or greater, and an elliptic fibration when either Hodge number is 228 or greater. We find that for small h1,1 the fraction of polytopes in the KS database that do not have a genus one or elliptic fibration drops exponentially as h1,1 increases. We also consider the different toric fiber types that arise in the polytopes of elliptic Calabi-Yau threefolds.SCOAP
Leptogenesis from low energy CP violation.

We revisit the possibility of producing the observed baryon asymmetry of the Universe via thermal leptogenesis, where CP violation comes exclusively from the low-energy phases of the neutrino mixing matrix. We demonstrate the viability of thermal flavoured leptogenesis across seven orders of magnitude (106< T (GeV) < 1013), using modern numerical machinery, where the lower bound can be reached only if flavour effects are taken into account and its value depends on the allowed degree of cancellation between the tree-level and radiative contributions to the light neutrino masses. At very high scales (T ≫1012 GeV), we clarify that thermal leptogenesis is sensitive to the low-energy phases, in contradiction with what is usually claimed in the literature. In particular we demonstrate that Majorana-phase leptogenesis is in general viable while Dirac-phase leptogenesis requires some level of fine-tunin