pinecone/core-2020-05-10-deduplication huggingface dataset:
An electroweak basis for neutrinoless double $\beta$ decay

A discovery of neutrinoless double-$\beta$ decay would be profound, providing
the first direct experimental evidence of $\Delta L=2$ lepton number violating
processes. While a natural explanation is provided by an effective Majorana
neutrino mass, other new physics interpretations should be carefully evaluated.
At low--energies such new physics could manifest itself in the form of color
and $SU(2)_L \times U(1)_{Y}$ invariant higher dimension operators. Here we
determine a complete set of electroweak invariant dimension--9 operators, and
our analysis supersedes those that only impose $U(1)_{em}$ invariance. Imposing
electroweak invariance implies: 1) a significantly reduced set of leading order
operators compared to only imposing $U(1)_{em}$ invariance; and 2) other
collider signatures. Prior to imposing electroweak invariance we find a minimal
basis of 24 dimension-9 operators, which is reduced to 11 electroweak invariant
operators at leading order in the expansion in the Higgs vacuum expectation
value. We set up a systematic analysis of the hadronic realization of the
4-quark operators using chiral perturbation theory, and apply it to determine
which of these operators have long-distance pion enhancements at leading order
in the chiral expansion. We also find at dimension--11 and dimension--13 the
electroweak invariant operators that after electroweak symmetry breaking
produce the remaining $\Delta L=2$ operators that would appear at dimension--9
if only $U(1)_{em}$ is imposed.Comment: 31 pages, 6 tables, 1 figure. v3 updated references and added
  extended introduction, conclusions unchanged from v2. v4: updated references;
  final published versio
BPS black hole horizons from massive IIA

The maximal four-dimensional supergravity with a dyonic ISO(7) gauging that
arises from the reduction of massive IIA on a six-sphere has recently been
shown to accommodate static BPS black holes with hyperbolic horizons. When
restricted to the N=2 subsector that retains one vector multiplet and the
universal hypermultiplet, the attractor mechanism was shown to fix both the
vector charges and the scalar fields at the horizon to a unique configuration
in terms of the gauging parameters. In order to assess the (non-)uniqueness of
BPS black hole horizons from massive IIA, we extend the study of the attractor
mechanism to other N=2 subsectors including additional matter multiplets. We
note that, while extending the hypermultiplet sector does not modify the set of
solutions to the attractor equations, the inclusion of additional vector
multiplets results in new hyperbolic/spherical horizons containing free
parameters. The model with three vector multiplets and the universal
hypermultiplet, which is the massive IIA analogue of the STU-model from
M-theory, may play a relevant role in massive IIA holography.Comment: 18 pages, 2 figures. v2: typos fixed, notation and presentation
  improved, references added. v3: published versio
A-twisted correlators and Hori dualities

The Hori-Tong and Hori dualities are infrared dualities between
two-dimensional gauge theories with $\mathcal{N}{=}(2,2)$ supersymmetry, which
are reminiscent of four-dimensional Seiberg dualities. We provide additional
evidence for those dualities with $U(N_c)$, $USp(2N_c)$, $SO(N)$ and $O(N)$
gauge groups, by matching correlation functions of Coulomb branch operators on
a Riemann surface $\Sigma_g$, in the presence of the topological $A$-twist. The
$O(N)$ theories studied, denoted by $O_+ (N)$ and $O_- (N)$, can be understood
as $\mathbb{Z}_2$ orbifolds of an $SO(N)$ theory. The correlators of these
theories on $\Sigma_g$ with $g > 0$ are obtained by computing correlators with
$\mathbb{Z}_2$-twisted boundary conditions and summing them up with weights
determined by the orbifold projection.Comment: 45 pages plus appendix; v2: updated bibliography and acknowledgement
Testing Invisible Momentum Ansatze in Missing Energy Events at the LHC

We consider SUSY-like events with two decay chains, each terminating in an
invisible particle, whose true energy and momentum are not measured in the
detector. Nevertheless, a useful educated guess about the invisible momenta can
still be obtained by optimizing a suitable invariant mass function. We review
and contrast several proposals in the literature for such ansatze: four
versions of the M_T2-assisted on-shell reconstruction (MAOS), as well as
several variants of the on-shell constrained M_2 variables. We compare the
performance of these methods with regards to the mass determination of a new
particle resonance along the decay chain from the peak of the reconstructed
invariant mass distribution. For concreteness, we consider the event topology
of dilepton ttbar events and study each of the three possible subsystems, in
both a ttbar and a SUSY example. We find that the M_2 variables generally
provide sharper peaks and therefore better ansatze for the invisible momenta.
We show that the performance can be further improved by preselecting events
near the kinematic endpoint of the corresponding variable from which the
momentum ansatz originates.Comment: 38 pages, 15 figure
Wigner function and kinetic phenomena for chiral plasma in a strong
  magnetic field

By using the exact solutions of the Weyl equation in a constant magnetic
field, the equal-time Wigner function for magnetized chiral plasma is derived.
It is found that the dependence of the Wigner function on the component of
momentum along the magnetic field is asymmetric and is correlated with the
fermion chirality. Such a dependence is principal for reproducing the correct
chiral magnetic and chiral separation effects. In the lowest Landau level
approximation, the equation for the equal-time Wigner function in a strong
magnetic field is derived. By making use of this equation, it is found that the
longitudinal collective modes in a strong magnetic field are gapped plasmons
whose gap is determined by the magnetic field. Unlike the ordinary magnetic
field, an axial one allows for the dispersion law of the collective excitations
asymmetric in the wave vector. The thermoelectric phenomena for chiral fermions
in strong magnetic and axial magnetic fields are studied and the corresponding
transport coefficients are calculated.Comment: 32 pages, 3 multi-panel figures; published versio
A leptoquark model to accommodate $R_K^\mathrm{exp} <R_K^\mathrm{SM} $
  and $R_{K^\ast}^\mathrm{exp}< R_{K^\ast}^\mathrm{SM}$

We show that a modification of the model with a low energy scalar leptoquark
state carrying hypercharge $Y=7/6$ allows to accommodate both $R_K<1$ and
$R_{K^\ast}<1$, through loop effects, consistent with recent observations made
at LHCb. We describe details of the model, compute the relevant Wilson
coefficient and, after discussing a number of constraints, we examine the
phenomenological consequences of the model. The bounds on the lepton flavor
violating decay rates, induced by this model, include $\mathcal{B}(Z\to\mu\tau)
\lesssim \mathcal{O}(10^{-7})$, and $\mathcal{B}(B\to K\mu\tau) \lesssim
\mathcal{O}(10^{-9})$. We also comment on the interpretation of the bounds on
the leptoquark mass obtained from the direct searches at LHC.Comment: 18 pages, 7 figures (published version
$D \to \rho \,\ell^+\ell^-$ Decays in the QCD Factorization Approach

We consider rare semileptonic decays of a heavy $D$-meson into a light vector
meson in the framework of QCD factorization. In contrast to the corresponding
$B$-meson decays, the naive factorization hypothesis does not even serve as a
first approximation. Rather, the decay amplitudes appear to be dominated by
non-factorizable dynamics, e.g. through annihilation topologies, which are
particularly sensitive to long-distance hadronic contributions. We therefore
pay particular attention to intermediate vector-meson resonances appearing in
quark-loop and annihilation topologies. Compared to the analogous $B$-meson
decays, we identify a number of effects that result in very large theoretical
uncertainties for differential decay rates. Some of these effects are found to
cancel in the ratio of partially integrated decay rates for transversely and
longitudinally polarized $\rho$ mesons. On the phenomenological side this
implies a very limited potential to constrain physics beyond the Standard Model
by means of these decays.Comment: 40 pages, 12 figures, minor text changes, minor bug in numerical
  output fixed, conclusions unchange
Higher spin currents in the critical $O(N)$ vector model at $1/N^2$

We calculate the anomalous dimensions of higher spin singlet currents in the
critical $O(N)$ vector model at order $1/N^2$. The results are shown to be in
agreement with the four-loop perturbative computation in $\phi^4$ theory in
$4-2\epsilon$ dimensions. It is known that the order $1/N$ anomalous dimensions
of higher-spin currents happen to be the same in the Gross-Neveu and the
critical vector model. On the contrary, the order $1/N^2$ corrections are
different. The results can also be interpreted as a prediction for the two-loop
computation in the dual higher-spin gravity.Comment: 17 pages, 5 figure
Log corrections to entropy of three dimensional black holes with soft
  hair

We calculate log corrections to the entropy of three-dimensional black holes
with "soft hairy" boundary conditions. Their thermodynamics possesses some
special features that preclude a naive direct evaluation of these corrections,
so we follow two different approaches. The first one exploits that the BTZ
black hole belongs to the spectrum of Brown-Henneaux as well as soft hairy
boundary conditions, so that the respective log corrections are related through
a suitable change of the thermodynamic ensemble. In the second approach the
analogue of modular invariance is considered for dual theories with anisotropic
scaling of Lifshitz type with dynamical exponent z at the boundary. On the
gravity side such scalings arise for KdV-type boundary conditions, which
provide a specific 1-parameter family of multi-trace deformations of the usual
AdS3/CFT2 setup, with Brown-Henneaux corresponding to z=1 and soft hairy
boundary conditions to the limiting case z=0. Both approaches agree in the case
of BTZ black holes for any non-negative z. Finally, for soft hairy boundary
conditions we show that not only the leading term, but also the log corrections
to the entropy of black flowers endowed with affine u(1) soft hair charges
exclusively depend on the zero modes and hence coincide with the ones for BTZ
black holes.Comment: 15 pages, no figures, v2: added re
Gravitational wave, collider and dark matter signals from a scalar singlet electroweak baryogenesis

We analyse a simple extension of the SM with just an additional scalar singlet coupled to the Higgs boson. We discuss the possible probes for electroweak baryogenesis in this model including collider searches, gravitational wave and direct dark matter detection signals. We show that a large portion of the model parameter space exists where the observation of gravitational waves would allow detection while the indirect collider searches would not.Ankit Beniwal, Marek Lewicki, James D. Wells, Martin White, Anthony G. William
$B_{s}\to K \ell \nu_\ell$ and $B_{(s)} \to \pi (K) \ell^+\ell^-$ decays
  at large recoil and CKM matrix elements

We provide hadronic input for the $B$-meson semileptonic transitions to a
light pseudoscalar meson at large recoil. The $B_s\to K$ form factor calculated
from QCD light-cone sum rule is updated, to be used for a $|V_{ub}|$
determination from the $B_s\to K \ell \nu$ width. Furthermore, we calculate the
hadronic input for the binned observables of $B \to \pi \ell^+ \ell^-$ and $B
\to K \ell^+ \ell^-$. In addition to the form factors, the nonlocal hadronic
matrix elements are obtained, combining QCD factorization and light-cone sum
rules with hadronic dispersion relations. We emphasize that, due to nonlocal
effects, the ratio of branching fractions of these decays is not sufficient for
an accurate extraction of the $|V_{td}/V_{ts}|$ ratio. Instead, we suggest to
determine the Wolfenstein parameters $A,\rho,\eta$ of the CKM matrix, combining
the branching fractions of $B \to K \ell^+ \ell^-$ and $B \to \pi \ell^+
\ell^-$ with the direct $CP$-asymmetry in the latter decay. We also obtain the
hadronic matrix elements for a yet unexplored channel $B_s \to K \ell^+
\ell^-$.Comment: 21 pages, 4 figures, 5 tables, a few comments and references addded,
  version accepted for publication in JHE
On Higgs decays to hadrons and the R-ratio at N^4LO

We present the first determination of Higgs-boson decay to hadrons at the
next-to-next-to-next-to-next-to-leading order of perturbative QCD in the limit
of a heavy top quark and massless light flavours. This result has been obtained
by computing the absorptive parts of the relevant five-loop self-energy for a
general gauge group and combining the outcome with the corresponding
coefficient function already known to this order in QCD. Our new result reduces
the uncertainty due to the truncation of the perturbation series to a fraction
of the uncertainty due to the present error of the strong coupling constant. We
have also performed the corresponding but technically simpler computations for
direct Higgs decay to bottom quarks and for the electromagnetic R-ratio in e^+
e^- -> hadrons, thus verifying important fifth-order results obtained so far
only by one group.Comment: 26 pages, LaTeX, 2 axodraw2 and 4 eps figures. FORM files of the main
  results available with the source. v2: version accepted by JHEP: introduction
  and summary slightly extended, minor other text changes, a few additional
  reference
Factorization and Resummation for Massive Quark Effects in Exclusive
  Drell-Yan

Exclusive differential spectra in color-singlet processes at hadron colliders
are benchmark observables that have been studied to high precision in theory
and experiment. We present an effective-theory framework utilizing
soft-collinear effective theory to incorporate massive (bottom) quark effects
into resummed differential distributions, accounting for both heavy-quark
initiated primary contributions to the hard scattering process as well as
secondary effects from gluons splitting into heavy-quark pairs. To be specific,
we focus on the Drell-Yan process and consider the vector-boson transverse
momentum, $q_T$, and beam thrust, $\mathcal T$, as examples of exclusive
observables. The theoretical description depends on the hierarchy between the
hard, mass, and the $q_T$ (or $\mathcal T$) scales, ranging from the decoupling
limit $q_T \ll m$ to the massless limit $m \ll q_T$. The phenomenologically
relevant intermediate regime $m \sim q_T$ requires in particular quark-mass
dependent beam and soft functions. We calculate all ingredients for the
description of primary and secondary mass effects required at NNLL$'$
resummation order (combining NNLL evolution with NNLO boundary conditions) for
$q_T$ and $\mathcal T$ in all relevant hierarchies. For the $q_T$ distribution
the rapidity divergences are different from the massless case and we discuss
features of the resulting rapidity evolution. Our results will allow for a
detailed investigation of quark-mass effects in the ratio of $W$ and $Z$ boson
spectra at small $q_T$, which is important for the precision measurement of the
$W$-boson mass at the LHC.Comment: 42 pages + appendices, 21 figures; v2: journal versio
Cornering Natural SUSY at LHC Run II and Beyond

We derive the latest constraints on various simplified models of natural SUSY
with light higgsinos, stops and gluinos, using a detailed and comprehensive
reinterpretation of the most recent 13 TeV ATLAS and CMS searches with $\sim
15$ fb$^{-1}$ of data. We discuss the implications of these constraints for
fine-tuning of the electroweak scale. While the most "vanilla" version of SUSY
(the MSSM with $R$-parity and flavor-degenerate sfermions) with 10% fine-tuning
is ruled out by the current constraints, models with decoupled valence squarks
or reduced missing energy can still be fully natural. However, in all of these
models, the mediation scale must be extremely low ($<100$ TeV). We conclude by
considering the prospects for the high-luminosity LHC era, where we expect the
current limits on particle masses to improve by up to $\sim 1$ TeV, and discuss
further model-building directions for natural SUSY that are motivated by this
work.Comment: v2: added tree level- parton shower matching, fixed bug in Delphes,
  main results unchanged. 24 pages, 7 figures, plus appendi
Hidden isometry of "T-duality without isometry"

We study the T-dualisability criteria of Chatzistavrakidis, Deser and Jonke
[3] who recently used Lie algebroid gauge theories to obtain sigma models
exhibiting a "T-duality without isometry". We point out that those
T-dualisability criteria are not written invariantly in [3] and depend on the
choice of the algebroid framing. We then show that there always exists an
isometric framing for which the Lie algebroid gauging boils down to standard
Yang-Mills gauging. The "T-duality without isometry" of Chatzistavrakidis,
Deser and Jonke is therefore nothing but traditional isometric non-Abelian
T-duality in disguise.Comment: 15 page
3d $\mathcal{N}=2$ minimal SCFTs from Wrapped M5-branes

We study CFT data of 3-dimensional superconformal field theories (SCFTs)
arising from wrapped two M5-branes on closed hyperbolic 3-manifolds. Via
so-called 3d/3d correspondence, central charges of these SCFTs are related to a
$SL(2)$ Chern-Simons (CS) invariant on the 3-manifolds. We give a rigorous
definition of the invariant in terms of resurgence theory and a state-integral
model for the complex CS theory. We numerically evaluate the central charges
for several closed 3-manifolds with small hyperbolic volume. The computation
suggests that the wrapped M5-brane systems give infinitely many discrete SCFTs
with small central charges. We also analyze these `minimal' SCFTs in the eye of
3d $\mathcal{N}=2$ superconformal bootstrap.Comment: 32 pages, 7 figures; v2: minor corrections, references adde
The Supercurrent and Einstein equations in the Superconformal
  formulation

We give a new expression for the supercurrent and its conservation in curved
${\cal N}=1$, $D=4$ superspace using the superconformal approach. The first
component of the superfield, whose lowest component is the vector auxiliary
field gives the (super)Einstein equations. Its trace and couplings to conformal
and non-conformal matter is presented. In a suitable dilatational gauge, the
conformal gauge, we obtain an update of the Callan-Coleman-Jackiw improved
currents for conformal matter, containing $R$-symmetry corrections for a new
traceless covariantly conserved energy--momentum tensor. We observe that in the
Poincar\'e gauge, where standard Poincar\'e supergravity is usually formulated,
the currents are not improved and then the higher conformal symmetry of the
matter sector is obscured. The curvature multiplets are used to find
supersymmetric curved backgrounds and some examples are exhibited in agreement
with existing results.Comment: 43 pages; v2: Typos corrected. A subsection, an appendix and
  references adde
Time dependence of entanglement entropy on the fuzzy sphere

We numerically study the behaviour of entanglement entropy for a free scalar
field on the noncommutative ("fuzzy") sphere after a mass quench. It is known
that the entanglement entropy before a quench violates the usual area law due
to the non-local nature of the theory. By comparing our results to the ordinary
sphere, we find results that, despite this non-locality, are compatible with
entanglement being spread by ballistic propagation of entangled quasi-particles
at a speed no greater than the speed of light. However, we also find that, when
the pre-quench mass is much larger than the inverse of the short-distance
cutoff of the fuzzy sphere (a regime with no commutative analogue), the
entanglement entropy spreads faster than allowed by a local model.Comment: 1+14 pages, 8 figures v2: References added, matches published versio
Detection prospects of light pseudoscalar Higgs boson at the LHC

The discovery potential of light pseudo scalar Higgs boson for the mass range
10-60 GeV is explored. In the context of the next-to-minimal supersymmetric
standard(NMSSM) model, the branching fraction of light pseudo scalar Higgs
boson decaying to a pair of photon can be quite large. A pair of light pseudo
scalar Higgs boson produced indirectly through the standard model Higgs boson
decay yields multiple photons in the final state and the corresponding
production rate is restricted by ATLAS data. Discussing the impact of this
constraint in the NMSSM, the detection prospects of light pseudoscalar Higgs
boson in the channel consisting of at least three photons, a lepton and missing
transverse energy are reported. It is observed that the possibilities of
finding the pseudoscalar Higgs boson for the above mass range are promising for
an integrated luminosity $\mathcal{L}=100 \text{fb}^{-1}$ with moderate
significances, which can reach to more than 5$\sigma$ for higher luminosity
options.Comment: 24 pages, 4 figures, updated reference
Compilation of low-energy constraints on 4-fermion operators in the
  SMEFT

We compile information from low-energy observables sensitive to
flavor-conserving 4-fermion operators with two or four leptons. Our analysis
includes data from e+e- colliders, neutrino scattering on electron or nucleon
targets, atomic parity violation, parity-violating electron scattering, and the
decay of pions, neutrons, nuclei and tau leptons. We recast these data as
tree-level constraints on 4-fermion operators in the Standard Model Effective
Field Theory (SMEFT) where the SM Lagrangian is extended by dimension-6
operators. We allow all independent dimension-6 operators to be simultaneously
present with an arbitrary flavor structure. The results are presented as a
multi-dimensional likelihood function in the space of dimension-6 Wilson
coefficients, which retains information about the correlations. In this form,
the results can be readily used to place limits on masses and couplings in a
large class of new physics theories.Comment: 39 pages; full correlation matrix and likelihood function available
  in Mathematica notebook at
  https://www.dropbox.com/s/26nh71oebm4o12k/SMEFTlikelihood.nb?dl=0 v2:
  comments and references added, translation to Warsaw basis provided in
  notebook; v3: references adde
Multi-Soft gluon limits and extended current algebras at null-infinity

In this note we consider aspects of the current algebra interpretation of
multi-soft limits of tree-level gluon scattering amplitudes in four dimensions.
Building on the relation between a positive helicity gluon soft-limit and the
Ward identity for a level-zero Kac-Moody current, we use the double-soft limit
to define the Sugawara energy-momentum tensor and, by using the triple- and
quadruple-soft limits, show that it satisfies the correct OPEs for a CFT. We
study the resulting Knizhnik-Zamolodchikov equations and show that they hold
for positive helicity gluons in MHV amplitudes. Turning to the sub-leading
soft-terms we define a one-parameter family of currents whose Ward identities
correspond to the universal tree-level sub-leading soft-behaviour. We compute
the algebra of these currents formed with the leading currents and amongst
themselves. Finally, by parameterising the ambiguity in the double-soft limit
for mixed helicities, we introduce a non-trivial OPE between the holomorphic
and anti-holomorphic currents and study some of its implications.Comment: 24 pages, 1 figur