pinecone/core-2020-05-10-deduplication huggingface dataset:
Pinning down the large-x gluon with NNLO top-quark pair differential
  distributions

Top-quark pair production at the LHC is directly sensitive to the gluon PDF
at large x. While total cross-section data is already included in several PDF
determinations, differential distributions are not, because the corresponding
NNLO calculations have become available only recently. In this work we study
the impact on the large-x gluon of top-quark pair differential distributions
measured by ATLAS and CMS at $\sqrt{s}=8$ TeV. Our analysis, performed in the
NNPDF3.0 framework at NNLO accuracy, allows us to identify the optimal
combination of LHC top-quark pair measurements that maximize the constraints on
the gluon, as well as to assess the compatibility between ATLAS and CMS data.
We find that differential distributions from top-quark pair production provide
significant constraints on the large-x gluon, comparable to those obtained from
inclusive jet production data, and thus should become an important ingredient
for the next generation of global PDF fits.Comment: 42 pages, 21 figures, 11 tables, this version match the version
  accepted for publication in JHE
Quantum Quenches in a Holographic Kondo Model

We study non-equilibrium dynamics and quantum quenches in a recent
gauge/gravity duality model for a strongly coupled system interacting with a
magnetic impurity with $SU(N)$ spin. At large $N$, it is convenient to write
the impurity spin as a bilinear in Abrikosov fermions. The model describes an
RG flow triggered by the marginally relevant Kondo operator. There is a phase
transition at a critical temperature, below which an operator condenses which
involves both an electron and an Abrikosov fermion field. This corresponds to a
holographic superconductor in AdS$_2$ and models the impurity screening. We
study the time dependence of the condensate induced by quenches of the Kondo
coupling. The timescale for equilibration is generically given by the
lowest-lying quasinormal mode of the dual gravity model. This mode also governs
the formation of the screening cloud, which is obtained as the decrease of
impurity degrees of freedom with time. In the condensed phase, the leading
quasinormal mode is imaginary and the relaxation of the condensate is
over-damped. For quenches whose final state is close to the critical point of
the large $N$ phase transition, we study the critical slowing down and obtain
the combination of critical exponents $z\nu=1$. When the final state is exactly
at the phase transition, we find that the exponential ringing of the
quasinormal modes is replaced by a power-law behaviour of the form $\sim
t^{-a}\sin(b\log t)$. This indicates the emergence of a discrete scale
invariance.Comment: 23 pages + appendices, 11 figure
Study of the sign change of the Sivers function from STAR Collaboration
  W/Z production data

Recent data on the transverse single spin asymmetry $A_N$ measured by the
STAR Collaboration for $p^\uparrow \, p \to W^\pm/Z^0 \, X$ reactions at RHIC
allow the first investigation of the Sivers function in Drell-Yan processes and
of its expected sign change with respect to SIDIS processes. A new extraction
of the Sivers functions from the latest SIDIS data is performed and a critical
assessment of the significance of the STAR data is attempted.Comment: 17 pages, 16 pdf figures, uses jheppub.st
Exact renormalization of the photino mass in softly broken ${\cal N}=1$
  SQED with $N_f$ flavors regularized by higher derivatives

We consider the softly broken ${\cal N}=1$ supersymmetric electrodynamics,
regularized by higher derivatives. For this theory we demonstrate that the
renormalization of the photino mass is determined by integrals of double total
derivatives in the momentum space in all orders. Consequently, it is possible
to derive the NSVZ-like exact relation between the photino mass anomalous
dimension and the anomalous dimension of the matter superfields in the rigid
theory by direct summation of supergraphs. It is important that both these
renormalization group functions are defined in terms of the bare coupling
constant, so that the considered NSVZ-like relation is valid independently of
the subtraction scheme in the case of using the higher derivative
regularization. The factorization of integrals defining the photino mass
renormalization into integrals of double total derivatives is verified by an
explicit two-loop calculation.Comment: 32 pages, 8 figures; the version accepted for publication in JHE
Thermodynamic Volume and the Extended Smarr Relation

We continue to explore the scaling transformation in the reduced action
formalism of gravity models. As an extension of our construction, we consider
the extended forms of the Smarr relation for various black holes, adopting the
cosmological constant as the bulk pressure as in some literatures on black
holes. Firstly, by using the quasi-local formalism for charges, we show that,
in a general theory of gravity, the volume in the black hole thermodynamics
could be defined as the thermodynamic conjugate variable to the bulk pressure
in such a way that the first law can be extended consistently. This, so called,
thermodynamic volume can be expressed explicitly in terms of the metric and
field variables. Then, by using the scaling transformation allowed in the
reduced action formulation, we obtain the extended Smarr relation involving the
bulk pressure and the thermodynamic volume. In our approach, we do not resort
to Euler's homogeneous scaling of charges while incorporating the would-be
hairy contribution without any difficulty.Comment: 1+21 pages, plain LaTeX; v2 typo fixed and references adde
Effective field theory for magnetic compactifications

Magnetic flux plays an important role in compactifications of field and
string theories in two ways, it generates a multiplicity of chiral fermion zero
modes and it can break supersymmetry. We derive the complete four-dimensional
effective action for N=1 supersymmetric Abelian and non-Abelian gauge theories
in six dimensions compactified on a torus with flux. The effective action
contains the tower of charged states and it accounts for the mass spectrum of
bosonic and fermionic fields as well as their level-dependent interactions.
This allows us to compute quantum corrections to the mass and couplings of
Wilson lines. We find that the one-loop corrections vanish, contrary to the
case without flux. This can be traced back to the spontaneous breaking of a
symmetry of the six-dimensional theory by the background gauge field, with the
Wilson line as Goldstone boson.Comment: 34 pages, 6 figures; published versio
Soft Black Hole Absorption Rates as Conservation Laws

The absorption rate of low-energy, or soft, electromagnetic radiation by
spherically symmetric black holes in arbitrary dimensions is shown to be fixed
by conservation of energy and large gauge transformations. We interpret this
result as the explicit realization of the Hawking-Perry-Strominger Ward
identity for large gauge transformations in the background of a non-evaporating
black hole. Along the way we rederive and extend previous analytic results
regarding the absorption rate for the minimal scalar and the photon.Comment: 20 Pages, 1 figur
The Schouten tensor as a connection in the unfolding of 3D conformal
  higher-spin fields

A first-order differential equation is provided for a one-form, spin-s
connection valued in the two-row, width-(s-1) Young tableau of GL(5). The
connection is glued to a zero-form identified with the spin-s Cotton tensor.
The usual zero-Cotton equation for a symmetric, conformal spin-s tensor gauge
field in 3D is the flatness condition for the sum of the GL(5) spin-s and
background connections. This presentation of the equations allows to
reformulate in a compact way the cohomological problem studied in 1511.07389,
featuring the spin-s Schouten tensor. We provide full computational details for
spin 3 and 4 and present the general spin-s case in a compact way.Comment: 24 pages, references added, paragraph added in proo
Cardy Formula for 4d SUSY Theories and Localization

We study 4d $\mathcal{N}=1$ supersymmetric theories on a compact Euclidean
manifold of the form $S^1 \times\mathcal{M}_3$. Partition functions of gauge
theories on this background can be computed using localization, and explicit
formulas have been derived for different choices of the compact manifold
$\mathcal{M}_3$. Taking the limit of shrinking $S^1$, we present a general
formula for the limit of the localization integrand, derived by simple
effective theory considerations, generalizing the result of arXiv:1512.03376.
The limit is given in terms of an effective potential for the holonomies around
the $S^1$, whose minima determine the asymptotic behavior of the partition
function. If the potential is minimized in the origin, where it vanishes, the
partition function has a Cardy-like behavior fixed by $\mathrm{Tr}(R)$, while a
nontrivial minimum gives a shift in the coefficient. In all the examples that
we consider, the origin is a minimum if $\mathrm{Tr}(R) \leq 0$.Comment: 43 pages, v2: references added, changed slightly discussion in
  section
The analytic structure of conformal blocks and the generalized
  Wilson-Fisher fixed points

We describe in detail the method used in our previous work arXiv:1611.10344
to study the Wilson-Fisher critical points nearby generalized free CFTs,
exploiting the analytic structure of conformal blocks as functions of the
conformal dimension of the exchanged operator. Our method is equivalent to the
mechanism of conformal multiplet recombination set up by null states. We
compute, to the first non-trivial order in the $\epsilon$-expansion, the
anomalous dimensions and the OPE coefficients of infinite classes of scalar
local operators using just CFT data. We study single-scalar and
$O(N)$-invariant theories, as well as theories with multiple deformations. When
available we agree with older results, but we also produce a wealth of new
ones. Unitarity and crossing symmetry are not used in our approach and we are
able to apply our method to non-unitary theories as well. Some implications of
our results for the study of the non-unitary theories containing partially
conserved higher-spin currents are briefly mentioned.Comment: 38 pages, no figures; v2: 40 pages, typos corrected, references
  added; v3: matches published JHEP version, one reference adde
Siegel Modular Forms and Black Hole Entropy

We discuss the application of Siegel Modular Forms to Black Hole entropy
counting. The role of the Igusa cusp form $\chi_{10}$ in the D1D5P system is
well-known, and its transformation properties are what allows precision
microstate counting in this case. We apply a similar method to extract the
Fourier coefficients of other Siegel modular and paramodular forms, and we show
that they could serve as candidates for other types of black holes. We
investigate the growth of their coefficients, identifying the dominant
contributions and the leading logarithmic corrections in various regimes. We
also discuss similarities and differences to the behavior of $\chi_{10}$, and
possible physical interpretations of such forms both from a microscopic and
gravitational point of view.Comment: 41 pages + appendices. V2: typos fixed and references adde
Compensating strong coupling with large charge

We study some (conformal) field theories with global symmetries in the sector
where the value of the global charge $Q$ is large. We find (as expected) that
the low energy excitations of this sector are described by the general form of
Goldstone's theorem in the non-relativistic regime. We also derive the
unexpected result, first presented in [Hellerman et al. 2015], that the
effective field theory describing such sector of fixed $Q$ contains effective
couplings $\lambda_{\text{eff}}\sim \lambda^b /Q^{a}$, where $\lambda$ is the
original coupling. Hence, large charge leads to weak coupling. In the last
section of the paper we present an outline of how to compute anomalous
dimensions of the $O(n)$ model in this limit.Comment: 20 pages, 2 figures. Version accepted by JHE
Model-independent determination of the two-photon exchange contribution
  to hyperfine splitting in muonic hydrogen

We obtain a model-independent prediction for the two-photon exchange
contribution to the hyperfine splitting in muonic hydrogen. We use the relation
of the Wilson coefficients of the spin-dependent dimension-six four-fermion
operator of NRQED applied to the electron-proton and to the muon-proton
sectors. Their difference can be reliably computed using chiral perturbation
theory, whereas the Wilson coefficient of the electron-proton sector can be
determined from the hyperfine splitting in hydrogen. This allows us to give a
precise model-independent determination of the Wilson coefficient for the
muon-proton sector, and consequently of the two-photon exchange contribution to
the hyperfine splitting in muonic hydrogen, which reads $\delta \bar
E_{p\mu,\rm HF}^{\rm TPE}(nS)=-\frac{1}{n^3}1.161(20)$ meV. Together with the
associated QED analysis, we obtain a prediction for the hyperfine splitting in
muonic hydrogen that reads $E^{\rm th}_{p\mu,\rm HF}(1S)=182.623(27)$ meV and
$E^{\rm th}_{p\mu,\rm HF}(2S)=22.8123(33)$ meV. The error is dominated by the
two-photon exchange contribution.Comment: 18 pages, 4 figures, 3 tables. v2: Minor corrections to meet journal
  version, references adde
Multi-Boundary Entanglement in Chern-Simons Theory and Link Invariants

We consider Chern-Simons theory for gauge group $G$ at level $k$ on
3-manifolds $M_n$ with boundary consisting of $n$ topologically linked tori.
The Euclidean path integral on $M_n$ defines a quantum state on the boundary,
in the $n$-fold tensor product of the torus Hilbert space. We focus on the case
where $M_n$ is the link-complement of some $n$-component link inside the
three-sphere $S^3$. The entanglement entropies of the resulting states define
framing-independent link invariants which are sensitive to the topology of the
chosen link. For the Abelian theory at level $k$ ($G= U(1)_k$) we give a
general formula for the entanglement entropy associated to an arbitrary
$(m|n-m)$ partition of a generic $n$-component link into sub-links. The formula
involves the number of solutions to certain Diophantine equations with
coefficients related to the Gauss linking numbers (mod $k$) between the two
sublinks. This formula connects simple concepts in quantum information theory,
knot theory, and number theory, and shows that entanglement entropy between
sublinks vanishes if and only if they have zero Gauss linking (mod $k$). For $G
= SU(2)_k$, we study various two and three component links. We show that the
2-component Hopf link is maximally entangled, and hence analogous to a Bell
pair, and that the Whitehead link, which has zero Gauss linking, nevertheless
has entanglement entropy. Finally, we show that the Borromean rings have a
"W-like" entanglement structure (i.e., tracing out one torus does not lead to a
separable state), and give examples of other 3-component links which have
"GHZ-like" entanglement (i.e., tracing out one torus does lead to a separable
state).Comment: 37 pages, 19 figure
On four-derivative terms in IIB Calabi-Yau orientifold reductions

We perform a Kaluza-Klein reduction of IIB supergravity including purely
gravitational $\alpha '^3$-corrections on a Calabi-Yau threefold, and perform
the orientifold projection accounting for the presence of $O3/O7$-planes. We
consider infinitesimal K\"{a}hler deformations of the Calabi-Yau background and
derive the complete set of four-derivative couplings quadratic in these
fluctuations coupled to gravity. In particular, we find four-derivative
couplings of the K\"{a}hler moduli fields in the four-dimensional effective
supergravity theory, which are referred to as friction couplings in the context
of inflation.Comment: 19 pages, 0 figure
Hunting for Heavy Majorana Neutrinos with Lepton Number Violating
  Signatures at LHC

The neutrinophilic two-Higgs-doublet model ($\nu$2HDM) provides a natural way
to generate tiny neutrino mass from interactions with the new doublet scalar
$\Phi_\nu$ ($H^\pm,~H,~A$) and singlet neutrinos $N_R$ of TeV scale. In this
paper, we perform detailed simulations for the lepton number violating (LNV)
signatures at LHC arising from cascade decays of the new scalars and neutrinos
with the mass order $m_{N_R}<m_{\Phi_\nu}$. Under constraints from lepton
flavor violating processes and direct collider searches, their decay properties
are explored and lead to three types of LNV signatures: $2\ell^\pm
4j+\cancel{E}_T$, $3\ell^\pm 4j+\cancel{E}_T$, and $3\ell^\pm\ell^\mp 4j$. We
find that the same-sign trilepton signature $3\ell^\pm4j+\cancel{E}_T$ is quite
unique and is the most promising discovery channel at the high-luminosity LHC.
Our analysis also yields the $95\%$ C.L. exclusion limits in the plane of the
$\Phi_\nu$ and $N_R$ masses at 13 (14) TeV LHC with an integrated luminosity of
100~(3000)/fb.Comment: 31 pages, 17 figures, 6 tables; v2: added a few refs and updated one
  ref, without other change
Quintic quasi-topological gravity

We construct a quintic quasi-topological gravity in five dimensions, i.e. a
theory with a Lagrangian containing $\mathcal{R}^5$ terms and whose field
equations are of second order on spherically (hyperbolic or planar) symmetric
spacetimes. These theories have recently received attention since when
formulated on asymptotically AdS spacetimes might provide for gravity duals of
a broad class of CFTs. For simplicity we focus on five dimensions. We show that
this theory fulfils a Birkhoff's Theorem as it is the case in Lovelock gravity
and therefore, for generic values of the couplings, there is no s-wave
propagating mode. We prove that the spherically symmetric solution is
determined by a quintic algebraic polynomial equation which resembles Wheeler's
polynomial of Lovelock gravity. For the black hole solutions we compute the
temperature, mass and entropy and show that the first law of black holes
thermodynamics is fulfilled. Besides of being of fourth order in general, we
show that the field equations, when linearized around AdS are of second order,
and therefore the theory does not propagate ghosts around this background.
Besides the class of theories originally introduced in arXiv:1003.4773 [gr-qc],
the general geometric structure of these Lagrangians remains an open problem.Comment: 20 pages, no figure
Quasinormal modes of charged magnetic black branes & chiral magnetic
  transport

We compute quasinormal modes (QNMs) of the metric and gauge field
perturbations about black branes electrically and magnetically charged in the
Einstein-Maxwell-Chern-Simons theory. By the gauge/gravity correspondence, this
theory is dual to a particular class of field theories with a chiral anomaly,
in a thermal charged plasma state subjected to a constant external magnetic
field, $B$. The QNMs are dual to the poles of the two-point functions of the
energy-momentum and axial current operators, and they encode information about
the dissipation and transport of charges in the plasma. Complementary to the
gravity calculation, we work out the hydrodynamic description of the dual field
theory in the presence of a chiral anomaly, and a constant external $B$. We
find good agreement with the weak field hydrodynamics, which can extend beyond
the weak $B$ regime into intermediate regimes. Furthermore, we provide results
that can be tested against thermodynamics and hydrodynamics in the strong $B$
regime. We find QNMs exhibiting Landau level behavior, which become long-lived
at large $B$ if the anomaly coefficient exceeds a critical magnitude. Chiral
transport is analyzed beyond the hydrodynamic approximation for the five
(formerly) hydrodynamic modes, including a chiral magnetic wave.Comment: 29 pages + appendix, 14 figures; v2: references added, published
  versio
Cubic interactions of Maxwell-like higher spins

We study the cubic vertices for Maxwell-like higher-spins in flat and (A)dS
background spaces of any dimension. Reducibility of their free spectra implies
that a single cubic vertex involving any three fields subsumes a number of
couplings among different particles of various spins. The resulting vertices do
not involve traces of the fields and in this sense are simpler than their
Fronsdal counterparts. We propose an extension of both the free theory and of
its cubic deformation to a more general class of partially reducible systems,
that one can obtain from the original theory upon imposing trace constraints of
various orders. The key to our results is a version of the Noether procedure
allowing to systematically account for the deformations of the transversality
conditions to be imposed on the gauge parameters at the free level.Comment: 57 pages; added Section 7 including (A)dS off-shell cubic vertices
  and corresponding generating function. Outlook extended with comments on
  Maxwell-like spectra and higher-spin algebra
Perturbative spacetimes from Yang-Mills theory

The double copy relates scattering amplitudes in gauge and gravity theories.
In this paper, we expand the scope of the double copy to construct spacetime
metrics through a systematic perturbative expansion. The perturbative procedure
is based on direct calculation in Yang-Mills theory, followed by squaring the
numerator of certain perturbative diagrams as specified by the double-copy
algorithm. The simplest spherically symmetric, stationary spacetime from the
point of view of this procedure is a particular member of the
Janis-Newman-Winicour family of naked singularities. Our work paves the way for
applications of the double copy to physically interesting problems such as
perturbative black-hole scattering.Comment: v2: 20 pages + refs, minor improvement
Various semiclassical limits of torus conformal blocks

We study four types of one-point torus blocks arising in the large central
charge regime. According to different limits of conformal dimensions we
distinguish between the global block, the light block, the heavy-light block,
and the linearized classical block. We show that they are not independent and
connected to each other by various links. We find that the global, light, and
heavy-light blocks correspond to three different contractions of the Virasoro
algebra. Also, we formulate the c-recursive representation of the one-point
torus blocks which is relevant in the semiclassical approximation.Comment: 23 page
Dynamical scales for multi-TeV top-pair production at the LHC

We calculate all major differential distributions with stable top-quarks at
the LHC. The calculation covers the multi-TeV range that will be explored
during LHC Run II and beyond. Our results are in the form of high-quality
binned distributions. We offer predictions based on three different parton
distribution function (pdf) sets. In the near future we will make our results
available also in the more flexible fastNLO format that allows fast
re-computation with any other pdf set. In order to be able to extend our
calculation into the multi-TeV range we have had to derive a set of dynamic
scales. Such scales are selected based on the principle of fastest perturbative
convergence applied to the differential and inclusive cross-section. Many
observations from our study are likely to be applicable and useful to other
precision processes at the LHC. With scale uncertainty now under good control,
pdfs arise as the leading source of uncertainty for TeV top production. Based
on our findings, true precision in the boosted regime will likely only be
possible after new and improved pdf sets appear. We expect that LHC top-quark
data will play an important role in this process.Comment: 27 pages, 16 figures, all results attached in electronic form,
  version published in JHE