pinecone/core-2020-05-10-deduplication huggingface dataset:
Worldsheet Instantons and the amplitude for string pair production in an
  external field as a WKB exact functional integral

We revisit the problem of charged string pair creation in a constant external
electric field. The string states are massive and creation of pairs from the
vacuum is a tunnelling process, analogous to the Schwinger process where
charged particle-anti-particle pairs are created by an electric field. We find
the instantons in the worldsheet sigma model which are responsible for the
tunnelling events. We evaluate the sigma model partition function in the
multi-instanton sector in the WKB approximation which keeps the classical
action and integrates the quadratic fluctuations about the solution. We find
that the summation of the result over all multi-instanton sectors reproduces
the known amplitude. This suggests that corrections to the WKB limit must
cancel. To show that they indeed cancel, we identify a fermionic symmetry of
the sigma model which occurs in the instanton sectors and which is associated
with collective coordinates. We demonstrate that the action is symmetric and
that the interaction action is an exact form. These conditions are sufficient
for localization of the worldsheet functional integral onto its WKB limit.Comment: 40 pages; Expanded discussion section, added reference
Holographic RG flows on curved manifolds and quantum phase transitions

Holographic RG flows dual to QFTs on maximally symmetric curved manifolds
(dS$_d$, AdS$_d$, and $S^d$) are considered in the framework of
Einstein-dilaton gravity in $d+1$ dimensions. A general dilaton potential is
used and the flows are driven by a scalar relevant operator. The general
properties of such flows are analyzed and the UV and IR asymptotics computed.
New RG flows can appear at finite curvature which do not have a zero curvature
counterpart. The so-called 'bouncing flows', where the $\beta$-function has a
branch cut at which it changes sign, are found to persist at finite curvature.
Novel quantum first-order phase transitions are found, triggered by a variation
in the $d$-dimensional curvature in theories allowing multiple ground states.Comment: 57 pages + appendices, 32 figures; v2: references added,
  clarifications added in sec. 6.2; v3: section 4.5 on perturbative stability
  added, section 5.2 on the holographic beta function added, references adde
Romans Supergravity from Five-Dimensional Holograms

We study five-dimensional superconformal field theories and their holographic
dual, matter-coupled Romans supergravity. On the one hand, some recently
derived formulae allow us to extract the central charges from deformations of
the supersymmetric five-sphere partition function, whose large N expansion can
be computed using matrix model techniques. On the other hand, the conformal and
flavor central charges can be extracted from the six-dimensional supergravity
action, by carefully analyzing its embedding into type I' string theory. The
results match on the two sides of the holographic duality. Our results also
provide analytic evidence for the symmetry enhancement in five-dimensional
superconformal field theories.Comment: 57 pages, 4 figures, 6 tables; v2: references adde
Conformal Bootstrap At Large Charge

We consider unitary CFTs with continuous global symmetries in $d>2$. We
consider a state created by the lightest operator of large charge $Q \gg 1$ and
analyze the correlator of two light charged operators in this state. We assume
that the correlator admits a well-defined large $Q$ expansion and, relatedly,
that the macroscopic (thermodynamic) limit of the correlator exists. We find
that the crossing equations admit a consistent truncation, where only a finite
number $N$ of Regge trajectories contribute to the correlator at leading
nontrivial order. We classify all such truncated solutions to the crossing. For
one Regge trajectory $N=1$, the solution is unique and given by the effective
field theory of a Goldstone mode. For two or more Regge trajectories $N \geq
2$, the solutions are encoded in roots of a certain degree $N$ polynomial. Some
of the solutions admit a simple weakly coupled EFT description, whereas others
do not. In the weakly coupled case, each Regge trajectory corresponds to a
field in the effective Lagrangian.Comment: 50 pages, 1 figur
Seeking Fixed Points in Multiple Coupling Scalar Theories in the
  $\varepsilon$ Expansion

Fixed points for scalar theories in $4-\varepsilon$, $6-\varepsilon$ and
$3-\varepsilon$ dimensions are discussed. It is shown how a large range of
known fixed points for the four dimensional case can be obtained by using a
general framework with two couplings. The original maximal symmetry, $O(N)$, is
broken to various subgroups, both discrete and continuous. A similar discussion
is applied to the six dimensional case. Perturbative applications of the
$a$-theorem are used to help classify potential fixed points. At lowest order
in the $\varepsilon$-expansion it is shown that at fixed points there is a
lower bound for $a$ which is saturated at bifurcation points.Comment: v1: 55 pages. v2: 58 pages; new fixed points in 4-{\epsilon}
  dimensions, further discussion of large-N behaviour in 3-{\epsilon}
  dimensions, additional references; v3: Typos fixed; v4: Added references.
  Version to appear in JHEP; v5: Minor emendations, references adde
Fermion Masses and Mixings and Dark Matter Constraints in a Model with
  Radiative Seesaw Mechanism

We formulate a predictive model of fermion masses and mixings based on a
$\Delta(27)$ family symmetry. In the quark sector the model leads to the viable
mixing inspired texture where the Cabibbo angle comes from the down quark
sector and the other angles come from both up and down quark sectors. In the
lepton sector the model generates a predictive structure for charged leptons
and, after radiative seesaw, an effective neutrino mass matrix with only one
real and one complex parameter. We carry out a detailed analysis of the
predictions in the lepton sector, where the model is only viable for inverted
neutrino mass hierarchy, predicting a strict correlation between $\theta_{23}$
and $\theta_{13}$. We show a benchmark point that leads to the best-fit values
of $\theta_{12}$, $\theta_{13}$, predicting a specific $\sin^2\theta_{23}
\simeq 0.51$ (within the $3 \sigma$ range), a leptonic CP-violating Dirac phase
$\delta \simeq 281.6 ^\circ$ and for neutrinoless double-beta decay $m_{ee}
\simeq 41.3$ meV. We turn then to an analysis of the dark matter candidates in
the model, which are stabilized by an unbroken $\mathbb{Z}_2$ symmetry. We
discuss the possibility of scalar dark matter, which can generate the observed
abundance through the Higgs portal by the standard WIMP mechanism. An
interesting possibility arises if the lightest heavy Majorana neutrino is the
lightest $\mathbb{Z}_2$-odd particle. The model can produce a viable fermionic
dark matter candidate, but only as a feebly interacting massive particle
(FIMP), with the smallness of the coupling to the visible sector protected by a
symmetry and directly related to the smallness of the light neutrino masses.Comment: 24 pages, 5 figures. Version accepted for publication in JHE
Gravitational multipole moments from Noether charges

We define the mass and current multipole moments for an arbitrary theory of
gravity in terms of canonical Noether charges associated with specific residual
transformations in canonical harmonic gauge, which we call multipole
symmetries. We show that our definition exactly matches Thorne's mass and
current multipole moments in Einstein gravity, which are defined in terms of
metric components. For radiative configurations, the total multipole charges --
including the contributions from the source and the radiation -- are given by
surface charges at spatial infinity, while the source multipole moments are
naturally identified by surface integrals in the near-zone or, alternatively,
from a regularization of the Noether charges at null infinity. The conservation
of total multipole charges is used to derive the variation of source multipole
moments in the near-zone in terms of the flux of multipole charges at null
infinity.Comment: v1: 22 pages + 13 pages of appendices, 1 figure; v2: published
  version in JHE
Probing compressed mass spectra in electroweak supersymmetry with
  Recursive Jigsaw Reconstruction

The lack of evidence for the production of colored supersymmetric particles
at the LHC has increased interest in searches for superpartners of the
electroweak SM gauge bosons, namely the neutralinos and charginos. These are
challenging due to the weak nature of the production process, and the existing
discovery reach has significant gaps in due to the difficulty of separating the
supersymmetric signal from SM diboson events that produce similar final states
and kinematics. We apply the Recursive Jigsaw Reconstruction technique to study
final states enriched in charged leptons and missing transverse momentum,
focusing on compressed topologies with direct production of charginos and
neutralinos decaying to the lightest neutral supersymmetric particle through
the emission of W and Z bosons. After presenting prototype analysis designs for
future LHC runs, we demonstrate that its detectors have the potential to probe
a significant amount of unexplored parameter space for chargino-neutralino
associated production within the next few years, and show that the very
challenging successful search for chargino pair production with compressed
spectra might be possible by the end of the LHC lifetime.Comment: 20 pages, 33 figure
Higgs boson pair production at NNLO with top quark mass effects.

We consider QCD radiative corrections to Higgs boson pair production through gluon fusion in proton collisions. We combine the exact next-to-leading order (NLO) contribution, which features two-loop virtual amplitudes with the full dependence on the top quark mass M t , with the next-to-next-to-leading order (NNLO) corrections computed in the large-M t approximation. The latter are improved with different reweighting techniques in order to account for finite-M t effects beyond NLO. Our reference NNLO result is obtained by combining one-loop double-real corrections with full M t dependence with suitably reweighted real-virtual and double-virtual contributions evaluated in the large-M t approximation. We present predictions for inclusive cross sections in pp collisions at  s√ = 13, 14, 27 and 100 TeV and we discuss their uncertainties due to missing M t effects. Our approximated NNLO corrections increase the NLO result by an amount ranging from +12% at  s√=13 TeV to +7% at  s√=100 TeV, and the residual uncertainty of the inclusive cross section from missing M t effects is estimated to be at the few percent level. Our calculation is fully differential in the Higgs boson pair and the associated jet activity: we also present predictions for various differential distributions at  s√=14 and 100 TeV, and discuss the size of the missing M t effects, which can be larger, especially in the tails of certain observables. Our results represent the most advanced perturbative prediction available to date for this process
Exploring Extended Scalar Sectors with Di-Higgs Signals: A Higgs EFT
  Perspective

We consider extended scalar sectors of the Standard Model as
ultraviolet-complete motivations for studying the effective Higgs
self-interaction operators of the Standard Model effective field theory. We
investigate all motivated heavy scalar models which generate the dimension-6
effective operator, $|H|^6$, at tree level and proceed to identify the full set
of tree-level dimension-six operators by integrating out the heavy scalars. Of
seven models which generate $|H|^6$ at tree level only two, quadruplets of
hypercharge $Y=3Y_H$ and $Y=Y_H$, generate only this operator. Next we perform
global fits to constrain relevant Wilson coefficients from the LHC single Higgs
measurements as well as the electroweak oblique parameters $S$ and $T$. We find
that the $T$ parameter puts very strong constraints on the Wilson coefficient
of the $|H|^6$ operator in the triplet and quadruplet models, while the singlet
and doublet models could still have Higgs self-couplings which deviate
significantly from the standard model prediction. To determine the extent to
which the $|H|^6$ operator could be constrained, we study the dihiggs
signatures at the future 100 TeV collider and explore future sensitivity of
this operator. Projected onto the Higgs potential parameters of the extended
scalar sectors, with $3$ ab$^{-1}$ luminosity data we will be able to explore
the Higgs potential parameters in all seven models.Comment: 25 pages, 11 figures, 6 tables; version 2: update figures and
  analysis in 2HDM and quadruplet
Zero-Range Effective Field Theory for Resonant Wino Dark Matter III.
  Annihilation Effects

Near a critical value of the wino mass where there is a zero-energy S-wave
resonance at the neutral-wino-pair threshold, low-energy winos can be described
by a zero-range effective field theory (ZREFT) in which the winos interact
nonperturbatively through a contact interaction and through Coulomb
interactions. The effects of wino-pair annihilation into electroweak gauge
bosons are taken into account through the analytic continuation of the real
parameters for the contact interaction to complex values. The parameters of
ZREFT can be determined by matching wino-wino scattering amplitudes calculated
by solving the Schr\"odinger equation for winos interacting through a real
potential due to the exchange of electroweak gauge bosons and an imaginary
potential due to wino-pair annihilation into electroweak gauge bosons. ZREFT at
leading order gives an accurate analytic description of low-energy wino-wino
scattering, inclusive wino-pair annihilation, and a wino-pair bound state.
ZREFT can also be applied to partial annihilation rates, such as the Sommerfeld
enhancement of the annihilation rate of wino pairs into monochromatic photons.Comment: 57 pages, 25 figures. Published version in JHEP. Final part of a 3
  part series. Part 1: arXiv:1706.02253 and 10.1007/JHEP11(2017)108. Part 2:
  arXiv:1708.07155 and 10.1007/JHEP02(2018)15
A minimal approach to the scattering of physical massless bosons

Tree and loop level scattering amplitudes which involve physical massless
bosons are derived directly from physical constraints such as locality,
symmetry and unitarity, bypassing path integral constructions. Amplitudes can
be projected onto a minimal basis of kinematic factors through linear algebra,
by employing four dimensional spinor helicity methods or at its most general
using projection techniques. The linear algebra analysis is closely related to
amplitude relations, especially the Bern-Carrasco-Johansson relations for gluon
amplitudes and the Kawai-Lewellen-Tye relations between gluons and graviton
amplitudes. Projection techniques are known to reduce the computation of loop
amplitudes with spinning particles to scalar integrals. Unitarity, locality and
integration-by-parts identities can then be used to fix complete tree and loop
amplitudes efficiently. The loop amplitudes follow algorithmically from the
trees. A range of proof-of-concept examples is presented. These include the
planar four point two-loop amplitude in pure Yang-Mills theory as well as a
range of one loop amplitudes with internal and external scalars, gluons and
gravitons. Several interesting features of the results are highlighted, such as
the vanishing of certain basis coefficients for gluon and graviton amplitudes.
Effective field theories are naturally and efficiently included into the
framework. The presented methods appear most powerful in non-supersymmetric
theories in cases with relatively few legs, but with potentially many loops.
For instance, iterated unitarity cuts of four point amplitudes for
non-supersymmetric gauge and gravity theories can be computed by matrix
multiplication, generalising the so-called rung-rule of maximally
supersymmetric theories. The philosophy of the approach to kinematics also
leads to a technique to control color quantum numbers of scattering amplitudes
with matter.Comment: 65 pages, exposition improved, typos correcte
Holographic Entanglement and Poincare blocks in three dimensional flat
  space

We propose a covariant prescription to compute holographic entanglement
entropy and Poincare blocks (Global BMS blocks) in the context of
three-dimensional Einstein gravity in flat space. We first present a
prescription based on worldline methods in the probe limit, inspired by recent
analog calculations in AdS/CFT. Building on this construction, we propose a
full extrapolate dictionary and use it to compute holographic correlators and
blocks away from the probe limit.Comment: 46 pages, 6 figure
Model with a gauged lepton flavor SU(2) symmetry

We propose a model having a gauged $SU(2)$ symmetry associated with the
second and third generations of leptons, dubbed $SU(2)_{\mu\tau}$, of which
$U(1)_{L_\mu-L_\tau}$ is an Abelian subgroup. In addition to the Standard Model
fields, we introduce two types of scalar fields. One exotic scalar field is an
$SU(2)_{\mu\tau}$ doublet and SM singlet that develops a nonzero vacuum
expectation value at presumably multi-TeV scale to completely break the
$SU(2)_{\mu\tau}$ symmetry, rendering three massive gauge bosons. At the same
time, the other exotic scalar field, carrying electroweak as well as
$SU(2)_{\mu\tau}$ charges, is induced to have a nonzero vacuum expectation
value as well and breaks mass degeneracy between the muon and tau. We examine
how the new particles in the model contribute to the muon anomalous magnetic
moment in the parameter space compliant with the Michel decays of tau.Comment: 21 pages, 13 figure
Localization of $U(1)$ gauge vector field on flat branes with
  five-dimension (asymptotic) AdS$_{5}$ spacetime

In order to localize $U(1)$ gauge vector field on Randall-Sundrum-like
braneworld model with infinite extra dimension, we propose a new kind of
non-minimal coupling between the $U(1)$ gauge field and the gravity. We propose
three kinds of coupling methods and they all support the localization of zero
mode. In addition, one of them can support the localization of massive modes.
Moreover, the massive tachyonic modes can be excluded. And our method can be
used not only in the thin braneword models but also in the thick ones.Comment: Added acknowledgments to the refree. Appeared on JHE
Measurement of differential cross sections and $W^+/W^-$ cross-section
  ratios for $W$ boson production in association with jets at $\sqrt{s}=8$ TeV
  with the ATLAS detector

This paper presents a measurement of the $W$ boson production cross section
and the $W^{+}/W^{-}$ cross-section ratio, both in association with jets, in
proton--proton collisions at $\sqrt{s}=8$ TeV with the ATLAS experiment at the
Large Hadron Collider. The measurement is performed in final states containing
one electron and missing transverse momentum using data corresponding to an
integrated luminosity of 20.2 fb$^{-1}$. Differential cross sections for events
with one or two jets are presented for a range of observables, including jet
transverse momenta and rapidities, the scalar sum of transverse momenta of the
visible particles and the missing transverse momentum in the event, and the
transverse momentum of the $W$ boson. For a subset of the observables, the
differential cross sections of positively and negatively charged $W$ bosons are
measured separately. In the cross-section ratio of $W^{+}/W^{-}$ the dominant
systematic uncertainties cancel out, improving the measurement precision by up
to a factor of nine. The observables and ratios selected for this paper provide
valuable input for the up quark, down quark, and gluon parton distribution
functions of the proton.Comment: 63 pages in total, author list starting page 47, 27 figures, 5
  tables, published version, all figures including auxiliary material are
  available at
  https://atlas.web.cern.ch/Atlas/GROUPS/PHYSICS/PAPERS/STDM-2016-14
Probing 6D Operators at Future $e^-e^+$ Colliders

We explore the sensitivities at future $e^-e^+$ colliders to probe a set of
six-dimensional operators which can modify the SM predictions on Higgs physics
and electroweak precision measurements. We consider the case in which the
operators are turned on simultaneously. Such an analysis yields a
"conservative" interpretation on the collider sensitivities, complementary to
the "optimistic" scenario where the operators are individually probed. After a
detail analysis at CEPC in both "conservative" and "optimistic" scenarios, we
also considered the sensitivities for FCC-ee and ILC. As an illustration of the
potential of constraining new physics models, we applied sensitivity analysis
to two benchmarks: holographic composite Higgs model and littlest Higgs model
Unification with Vector-like fermions and signals at LHC

We look for minimal extensions of Standard Model with vector like fermions
leading to precision unification of gauge couplings. Constraints from proton
decay, Higgs stability and perturbativity are considered. The simplest models
contain several copies of vector fermions in two different (incomplete)
representations. Some of these models encompass Type III seesaw mechanism for
neutrino masses whereas some others have a dark matter candidate. In all the
models, at least one of the candidates has non-trivial representation under
$SU(3)_{color}$. In the limit of vanishing Yukawa couplings, new QCD bound
states are formed, which can be probed at LHC. The present limits based on
results from 13 TeV already probe these particles for masses around a TeV.
Similar models can be constructed with three or four vector representations,
examples of which are presented.Comment: 48 pages; v3:major corrections with discussion on threshold
  corrections, version accepted for publication in JHE
Constraints on Higher Spin CFT$_2$

We derive constraints on two-dimensional conformal field theories with higher
spin symmetry due to unitarity, modular invariance, and causality. We focus on
CFTs with $\mathcal{W}_N$ symmetry in the "irrational" regime, where $c>N-1$
and the theories have an infinite number of higher-spin primaries. The most
powerful constraints come from positivity of the Kac matrix, which (unlike the
Virasoro case) is non-trivial even when $c>N-1$. This places a lower bound on
the dimension of any non-vacuum higher-spin primary state, which is linear in
the central charge. At large $c$, this implies that the dual holographic
theories of gravity in AdS$_3$, if they exist, have no local, perturbative
degrees of freedom in the semi-classical limit.Comment: 31 pages+refs, 4 figure
Elliptic polylogarithms and iterated integrals on elliptic curves I:
  general formalism

We introduce a class of iterated integrals, defined through a set of linearly
independent integration kernels on elliptic curves. As a direct generalisation
of multiple polylogarithms, we construct our set of integration kernels
ensuring that they have at most simple poles, implying that the iterated
integrals have at most logarithmic singularities. We study the properties of
our iterated integrals and their relationship to the multiple elliptic
polylogarithms from the mathematics literature. On the one hand, we find that
our iterated integrals span essentially the same space of functions as the
multiple elliptic polylogarithms. On the other, our formulation allows for a
more direct use to solve a large variety of problems in high-energy physics. We
demonstrate the use of our functions in the evaluation of the Laurent expansion
of some hypergeometric functions for values of the indices close to half
integers.Comment: 55 page