pinecone/core-2020-05-10-deduplication huggingface dataset:
CP Violation Tests of Alignment Models at LHCII

We analyse the low-energy phenomenology of alignment models both
model-independently and within supersymmetric (SUSY) scenarios focusing on
their CP violation tests at LHCII. Assuming that New Physics (NP) contributes
to K-Kbar and D-Dbar mixings only through non-renormalizable operators
involving SU(2)_L quark-doublets, we derive model-independent correlations
among CP violating observables of the two systems. Due to universality of CP
violation in Delta F=1 processes the bound on CP violation in Kaon mixing
generically leads to an upper bound on the size of CP violation in D mixing.
Interestingly, this bound is similar in magnitude to the current sensitivity
reached by the LHCb experiment which is starting now to probe the natural
predictions of alignment models. Within SUSY, we perform an exact analytical
computation of the full set of contributions for the D-Dbar mixing amplitude.
We point out that chargino effects are comparable and often dominant with
respect to gluino contributions making their inclusion in phenomenological
analyses essential. As a byproduct, we clarify the limit of applicability of
the commonly used mass insertion approximation in scenarios with
quasi-degenerate and split squarks.Comment: 26 pages, 5 figure
Perturbative Corrections to $\Lambda_b \to \Lambda$ Form Factors from
  QCD Light-Cone Sum Rules

We compute radiative corrections to $\Lambda_b \to \Lambda$ from factors, at
next-to-leading logarithmic accuracy, from QCD light-cone sum rules with
$\Lambda_b$-baryon distribution amplitudes. Employing the diagrammatic approach
factorization of the vacuum-to-$\Lambda_b$-baryon correlation function is
justified at leading power in $\Lambda/m_b$, with the aid of the method of
regions. Hard functions entering the factorization formulae are identical to
the corresponding matching coefficients of heavy-to-light currents from QCD
onto soft-collinear effective theory. The universal jet function from
integrating out the hard-collinear fluctuations exhibits richer structures
compared with the one involved in the factorization expressions of the
vacuum-to-$B$-meson correlation function. Based upon the QCD resummation
improved sum rules we observe that the perturbative corrections at ${\cal
O}(\alpha_s)$ shift the $\Lambda_b \to \Lambda$ from factors at large recoil
significantly and the dominant contribution originates from the next-to-leading
order jet function instead of the hard coefficient functions. Having at hand
the sum rule predictions for the $\Lambda_b \to \Lambda$ from factors we
further investigate several decay observables in the electro-weak penguin
$\Lambda_b \to \Lambda \, \ell^{+} \ell^{-}$ transitions in the factorization
limit (i.e., ignoring the "non-factorizable" hadronic effects which cannot be
expressed in terms of the $\Lambda_b \to \Lambda$ from factors), including the
invariant mass distribution of the lepton pair, the forward-backward asymmetry
in the dilepton system and the longitudinal polarization fraction of the
leptonic sector.Comment: 51 pages, 12 figure
Width of the flux tube in compact U(1) gauge theory in three dimensions

We study the squared width and the profile of flux tubes in compact U(1)
lattice gauge theory in three spacetime dimensions. The results obtained from
numerical calculations in the dual formulation of this confining theory are
compared with predictions from an effective bosonic-string model and from the
dual-superconductor model: it is found that the former fails at describing the
quantitative features of the flux tube, while the latter is in good agreement
with Monte Carlo data. The analytical interpretation of these results (in the
light of the semi-classical analysis by Polyakov) is pointed out, and a
comparison with non-Abelian gauge theories in four spacetime dimensions is
discussed.Comment: 19 pages, 5 pdf figures; v2: 21 pages, 8 pdf figures: references
  added, new data and new figures included, discussion slightly revise
Exact conformal blocks for the W-algebras, twist fields and
  isomonodromic deformations

We consider the conformal blocks in the theories with extended conformal
W-symmetry for the integer Virasoro central charges. We show that these blocks
for the generalized twist fields on sphere can be computed exactly in terms of
the free field theory on the covering Riemann surface, even for a non-abelian
monodromy group. The generalized twist fields are identified with particular
primary fields of the W-algebra, and we propose a straightforward way to
compute their W-charges. We demonstrate how these exact conformal blocks can be
effectively computed using the technique arisen from the gauge theory/CFT
correspondence. We discuss also their direct relation with the isomonodromic
tau-function for the quasipermutation monodromy data, which can be an
encouraging step on the way of definition of generic conformal blocks for
W-algebra using the isomonodromy/CFT correspondence.Comment: 30 pages, 5 figure
Hexagon OPE Resummation and Multi-Regge Kinematics

We analyse the OPE contribution of gluon bound states in the double scaling
limit of the hexagonal Wilson loop in planar N=4 super Yang-Mills theory. We
provide a systematic procedure for perturbatively resumming the contributions
from single-particle bound states of gluons and expressing the result order by
order in terms of two-variable polylogarithms. We also analyse certain
contributions from two-particle gluon bound states and find that, after
analytic continuation to the $2\to 4$ Mandelstam region and passing to
multi-Regge kinematics (MRK), only the single-particle gluon bound states
contribute. From this double-scaled version of MRK we are able to reconstruct
the full hexagon remainder function in MRK up to five loops by invoking
single-valuedness of the results.Comment: 29 pages, 3 figures, 4 ancillary file
Quark Seesaw, Vectorlike Fermions and Diphoton Excess

We present a possible interpretation of the recent diphoton excess reported
by the $\sqrt s=13$ TeV LHC data in quark seesaw left-right models with
vectorlike fermions proposed to solve the strong $CP$ problem without the
axion. The gauge singlet real scalar field responsible for the mass of the
vectorlike fermions has the right production cross section and diphoton
branching ratio to be identifiable with the reported excess at around 750 GeV
diphoton invariant mass. Various ways to test this hypothesis as more data
accumulates at the LHC are proposed.Comment: 18 pages, 6 figures, 1 table; section on high-scale validity and some
  discussions and references added, version to appear in JHE
Production of Inert Scalars at the high energy $e^+ e^-$ colliders

We investigate the phenomenology of the light charged and neutral scalars in
Inert Doublet Model at future $e^+ e^-$ colliders with center of mass energies
of 0.5 and 1 TeV, and integrated luminosity of 500~fb$^{-1}$. The analysis
covers two production processes, $e^{+}e^{-} \rightarrow H^{+}H^{-}$ and
$e^{+}e^{-}\rightarrow AH$, and consists of signal selections, cross section
determinations as well as dark matter mass measurements. Several benchmark
points are studied with focus on $H^{\pm} \rightarrow W^{\pm}H$ and $A
\rightarrow ZH$ decays. It is concluded that the signal will be well observable
in different final states allowing for mass determination of all new scalars
with statistical precision of the order of few hundred MeV.Comment: 29 pages, 12 figures and 21 tables. v2: title is modified, some
  discussion and references added. v3: few minor changes and matches the
  version to appear in JHE
Next-to-Next-to-Leading Order $N$-Jettiness Soft Function for One
  Massive Colored Particle Production at Hadron Colliders

The $N$-jettiness subtraction has proven to be an efficient method to perform
differential QCD next-to-next-to-leading order (NNLO) calculations in the last
few years. One important ingredient of this method is the NNLO soft function.
We calculate this soft function for one massive colored particle production at
hadron colliders. We select the color octet and color triplet cases to present
the final results. We also discuss its application in NLO and NNLO differential
calculations.Comment: 21 pages, 3 figures, version published in JHE
Using an intense laser beam in interaction with muon/electron beam to
  probe the Noncommutative QED

It is known that the linearly polarized photons can partly transform to
circularly polarized ones via forward Compton scattering in a background such
as the external magnetic field or noncommutative space time. Based on this fact
we explore the effects of the NC-background on the scattering of a linearly
polarized laser beam from an intense beam of charged leptons. We show that for
a muon/electron beam flux $\bar\varepsilon_{\mu,e}\sim 10^{12}/10^{10}\,{\rm
TeV}\,{\rm cm}^{-2}\,{\rm sec}^{-1}$ and a linearly polarized laser beam with
energy $k^0\sim $1 eV and average power $\bar{P}_{\rm laser}\simeq$1 MW, the
generation rate of circularly polarized photons is about $R_{_V} \sim 10^4/{\rm
sec}$ for Noncommutative energy scale $\Lambda_{\tiny{NC}}\sim 10$TeV.
  This is fairly large and can grow for more intense beams in near future
Equivalent Equations of Motion for Gravity and Entropy

We demonstrate an equivalence between the wave equation obeyed by the
entanglement entropy of CFT subregions and the linearized bulk Einstein
equation in Anti-de Sitter pace. In doing so, we make use of the formalism of
kinematic space [arXiv:1505.05515] and fields on this space, introduced in
[arXiv:1604.03110]. We show that the gravitational dynamics are equivalent to a
gauge invariant wave-equation on kinematic space and that this equation arises
in natural correspondence to the conformal Casimir equation in the CFT.Comment: 7+4 pages, 3 figure
Production of high stellar-mass primordial black holes in trapped
  inflation

Trapped inflation has been proposed to provide a successful inflation with a
steep potential. We discuss the formation of primordial black holes in the
trapped inflationary scenario. We show that primordial black holes are
naturally produced during inflation with a steep trapping potential. In
particular, we have given a recipe for an inflaton potential with which
particle production can induce large non-Gaussian curvature perturbation that
leads to the formation of high stellar-mass primordial black holes. These
primordial black holes could be dark matter observed by the LIGO detectors
through a binary black-hole merger. At the end, we have given an attempt to
realize the required inflaton potential in the axion monodromy inflation, and
discussed the gravitational waves sourced by the particle production.Comment: 6 pages, 5 figures, match the version accepted by JHE
Black holes in quasi-topological gravity and conformal couplings

Lovelock theory of gravity provides a tractable model to investigate the
effects of higher-curvature terms in the context of AdS/CFT. Yielding second
order, ghost-free field equations, this theory represents a minimal setup in
which higher-order gravitational couplings in asymptotically Anti-de Sitter
(AdS) spaces, including black holes, can be solved analytically. This however
has an obvious limitation as in dimensions lower than seven, the contribution
from cubic or higher curvature terms is merely topological. Therefore, in order
to go beyond quadratic order and study higher terms in AdS_5 analytically, one
is compelled to look for other toy models. One such model is the so-called
quasi-topological gravity, which, despite being a higher-derivative theory,
provides a tractable setup with R^3 and R^4 terms. In this paper, we
investigate AdS_5 black holes in quasi-topological gravity. We consider the
theory conformally coupled to matter and in presence of Abelian gauge fields.
We show that charged black holes in AdS_5 which, in addition, exhibit a
backreaction of the matter fields on the geometry can be found explicitly in
this theory. These solutions generalize the black hole solution of
quasi-topological gravity and exist in a region of the parameter spaces
consistent with the constraints coming from causality and other consistency
conditions. They have finite conserved charges and exhibit non-trivial
thermodynamical properties.Comment: 15 pages, 2 figures. V2: References and a new section on conformally
  invariant quasitopological gravity added. V3: References and analysis of the
  unique vacuum case added. V4: References added and typos corrected. To appear
  in JHE
ADE Spectral Networks and Decoupling Limits of Surface Defects

We study vacua and BPS spectra of canonical surface defects of class
$\mathcal{S}$ theories in different decoupling limits using ADE spectral
networks. In some regions of the IR moduli spaces of these 2d-4d systems, the
mixing between 2d and 4d BPS states is suppressed, and the spectrum of 2d-4d
BPS states becomes that of a 2d $\mathcal{N}=(2,2)$ theory. For some decoupling
limits, we identify the 2d theories describing the surface defects with
nonlinear sigma models and coset models that have been previously studied. We
also study certain cases where the decoupling limit of a surface defect
exhibits a set of vacua and a BPS spectrum that appear to be entirely new. A
detailed analysis of these spectra and their wall-crossing behavior is
performed.Comment: 50 pages with figures generated using
  http://het-math2.physics.rutgers.edu/loom and
  http://het-math2.physics.rutgers.edu/cproj ; v2: version published in JHE
A proposal of the gauge theory description of the small Schwarzschild
  black hole in AdS$_5\times$S$^5$

Based on 4d ${\cal N}=4$ SYM on $\mathbb{R}^{1}\times$S$^3$, a gauge theory
description of a small black hole in AdS$_5\times$S$^5$ is proposed. The change
of the number of dynamical degrees of freedom associated with the emission of
the scalar fields' eigenvalues plays a crucial role in this description. By
analyzing the microcanonical ensemble, the Hagedorn behavior of long strings at
low energy is obtained. Modulo an assumption based on the AdS/CFT duality for a
large black hole, the energy of the small ten-dimensional Schwarzschild black
hole $E\sim 1/(G_{\rm 10,N}T^7)$ is derived. A heuristic gauge theory argument
supporting this assumption is also given. The same argument applied to the ABJM
theory correctly reproduces the relation for the eleven-dimensional
Schwarzschild black hole. One of the consequences of our proposal is that the
small and large black holes are very similar when seen from the gauge theory
point of view.Comment: 16 pages, 8 figures. A few corrections in equations and logic have
  been added to section 3. The result remains unchange
Diffusion and Chaos from near AdS$_2$ horizons

We calculate the thermal diffusivity $D = \kappa/c_{\rho}$ and butterfly
velocity $v_B$ in holographic models that flow to AdS$_2 \times R^{d}$ fixed
points in the infra-red. We show that both these quantities are governed by the
same irrelevant deformation of AdS$_2$ and hence establish a simple
relationship between them. When this deformation corresponds to a universal
dilaton mode of dimension $\Delta = 2$ then this relationship is always given
by $D = v_B^2/(2 \pi T)$.Comment: 23 pages, Added references, Added minor comments in Appendix B,
  Version accepted at JHE
Systematics of Axion Inflation in Calabi-Yau Hypersurfaces

We initiate a comprehensive survey of axion inflation in compactifications of
type IIB string theory on Calabi-Yau hypersurfaces in toric varieties. For
every threefold with $h^{1,1} \le 4$ in the Kreuzer-Skarke database, we compute
the metric on K\"ahler moduli space, as well as the matrix of four-form axion
charges of Euclidean D3-branes on rigid divisors. These charges encode the
possibility of enlarging the field range via alignment. We then determine an
upper bound on the inflationary field range $\Delta \phi$ that results from the
leading instanton potential, in the absence of monodromy. The bound on the
field range in this ensemble is $\Delta \phi \lesssim 0.3 M_{\rm{pl}}$, in a
compactification where the smallest curve volume is $(2\pi)^2\alpha'$, and we
argue that the sigma model expansion is adequately controlled. The largest
increase resulting from alignment is a factor $\approx 2.6$. We also examine a
set of threefolds with $h^{1,1}$ up to $100$ and characterize their axion
charge matrices. We discuss how our findings could be modified by the effects
of orientifolding, seven-branes, and fluxes.Comment: 28 pages, 6 figures, 1 tabl
SU(N) gauge theories in 2+1 dimensions: glueball spectra and k-string
  tensions

We calculate the low-lying glueball spectrum and various string tensions in
SU(N) lattice gauge theories in 2+1 dimensions, and extrapolate the results to
the continuum limit. We do so for for the range N=2 to N=16 so as to control
the N-dependence with a useful precision. We observe a number of striking
near-degeneracies in the various J^PC sectors of the glueball spectrum, in
particular between C=+ and C=- states. We calculate the string tensions of flux
tubes in a number of representations, and provide evidence that the leading
correction to the N-dependence of the k-string tensions varies as 1/N rather
than 1/N^2, and that the dominant binding of k fundamental flux tubes into a
k-string is via pairwise interactions. We comment on the possible implications
of our results for the dynamics of these gauge theories.Comment: 52 pages, 14 figure
Holographic Isotropisation in Gauss-Bonnet Gravity

We study holographic isotropisation of homogeneous, strongly coupled,
non-Abelian plasmas in Gauss-Bonnet gravity with a negative cosmological
constant. We focus on small values of the Gauss-Bonnet coupling parameter
$\lambda_{GB}$ and linearise the equations of motion around a time-dependent
background solution with $\lambda_{GB}=0$. We numerically solve the linearised
equations and show that the entire time evolution of the pressure anisotropy
can be well approximated by the linear in $\lambda_{GB}$ corrections to the
quasinormal mode expansion, even in the cases of high anisotropy. We finally
show that, quite generally, the time evolution of the pressure anisotropy with
the Gauss-Bonnet term is approximately {\it shifted} with respect to the
evolution without it, with the sign of the shift being directly related to the
sign of the $\lambda_{GB}$ parameter. This suggests that finite coupling
corrections generically {\it increase} the isotropisation time of strongly
coupled plasmas.Comment: 31 pages, 6 figure
Affleck-Dine Leptogenesis with Varying Peccei-Quinn Scale

The Affleck-Dine leptogenesis scenario along the LHu flat direction is
reconsidered. It is known that successful Affleck-Dine leptogenesis requires
that the lightest neutrino mass is extremely small. This situation can be
significantly relaxed if the neutrino mass in the early universe is different
from the present one. We consider a supersymmetric
Dine-Fischler-Srednicki-Zhitnitsky (DFSZ) type model, which provides a solution
to the strong CP problem and generates a SUSY mu-term and right-handed neutrino
masses. If the PQ scale during lepton number generation is much larger than the
present value, leptogenesis is very efficient so that enough baryon number can
be generated without introducing a hierarchically small neutrino mass. The
final baryon asymmetry is related to the mu-term, and hence linked to the level
of electroweak fine-tuning. We also show the PQ breaking scalar dynamics that
keeps a large PQ breaking scale during inflation and lepton number generation.
The mu-term generating superpotential plays an important role for preserving
the lepton asymmetry during saxion oscillation. In this scenario, the axion
isocurvature perturbation is naturally suppressed.Comment: 1+21 pages, 1 figur
An Index for Ray Operators in 5d $E_n$ SCFTs

We construct an index for BPS operators supported on a ray in five
dimensional superconformal field theories with exceptional global symmetries.
We compute the $E_n$ representations (for $n=2,\dots,7$) of operators of low
spin, thus verifying that while the expression for the index is only
SO$(2n-2)\times$U(1) invariant, the index itself exhibits the full $E_n$
symmetry (at least up to the order we expanded). The ray operators we studied
in 5d can be viewed as generalizations of operators constructed in a Yang-Mills
theory with fundamental matter by attaching an open Wilson line to a quark. For
$n\le 7$, in contrast to local operators, they carry nontrivial charge under
the $\mathbb{Z}_{9-n}\subset E_n$ center of the global symmetry. The
representations that appear in the ray operator index are therefore different,
for $n\le 7$, from those appearing in the previously computed superconformal
index. For $3\le n\le 7$, we find that the leading term in the index is a
character of a minuscule representation of $E_n$. We also discuss the case
$n=8$, which presents a unique technical challenge, and remains an open
problem.Comment: 44 pages, 2 figure
New Formulas for Amplitudes from Higher-Dimensional Operators

In this paper we study tree-level amplitudes from higher-dimensional
operators, including $F^3$ operator of gauge theory, and $R^2$, $R^3$ operators
of gravity, in the Cachazo-He-Yuan formulation. As a generalization of the
reduced Pfaffian in Yang-Mills theory, we find a new, gauge-invariant object
that leads to gluon amplitudes with a single insertion of $F^3$, and gravity
amplitudes by Kawai-Lewellen-Tye relations. When reduced to four dimensions for
given helicities, the new object vanishes for any solution of scattering
equations on which the reduced Pfaffian is non-vanishing. This intriguing
behavior in four dimensions explains the vanishing of graviton helicity
amplitudes produced by the Gauss-Bonnet $R^2$ term, and provides a
scattering-equation origin of the decomposition into self-dual and
anti-self-dual parts for $F^3$ and $R^3$ amplitudes.Comment: 21 pages; v3: published version; a mistake in sec. 4.1 correcte
A Periodic Table of Effective Field Theories

We systematically explore the space of scalar effective field theories (EFTs)
consistent with a Lorentz invariant and local S-matrix. To do so we define an
EFT classification based on four parameters characterizing 1) the number of
derivatives per interaction, 2) the soft properties of amplitudes, 3) the
leading valency of the interactions, and 4) the spacetime dimension. Carving
out the allowed space of EFTs, we prove that exceptional EFTs like the
non-linear sigma model, Dirac-Born-Infeld theory, and the special Galileon lie
precisely on the boundary of allowed theory space. Using on-shell momentum
shifts and recursion relations, we prove that EFTs with arbitrarily soft
behavior are forbidden and EFTs with leading valency much greater than the
spacetime dimension cannot have enhanced soft behavior. We then enumerate all
single scalar EFTs in d<6 and verify that they correspond to known theories in
the literature. Our results suggest that the exceptional theories are the
natural EFT analogs of gauge theory and gravity because they are one-parameter
theories whose interactions are strictly dictated by properties of the
S-matrix.Comment: 54 pages, 4 figures, 2 tables; v3 matched to JHEP versio
Reconstruction of semileptonically decaying beauty hadrons produced in
  high energy pp collisions

It is well known that in $b$ hadron decays with a single unreconstructible
final state particle, the decay kinematics can be solved up to a quadratic
ambiguity, without any knowledge of the $b$ hadron momentum. We present a
method to infer the momenta of $b$ hadrons produced in hadron collider
experiments using information from their reconstructed flight vectors. Our
method is strictly agnostic to the decay itself, which implies that it can be
validated with control samples of topologically similar decays to fully
reconstructible final states. A multivariate regression algorithm based on the
flight information provides a $b$ hadron momentum estimate with a resolution of
around 60% which is sufficient to select the correct solution to the quadratic
equation in around 70% of cases. This will improve the ability of hadron
collider experiments to make differential decay rate measurements with
semileptonic $b$ hadron decays.Comment: 18 pages, 17 figures. Updated version to be published in JHE