pinecone/core-2020-05-10-deduplication huggingface dataset:
Probing for Invisible Higgs Decays with Global Fits

We demonstrate by performing a global fit on Higgs signal strength data that
large invisible branching ratios Br_{inv} for a Standard Model (SM) Higgs
particle are currently consistent with the experimental hints of a scalar
resonance at the mass scale m_h ~ 124 GeV. For this mass scale, we find
Br_{inv} < 0.64 (95 % CL) from a global fit to individual channel signal
strengths supplied by ATLAS, CMS and the Tevatron collaborations. Novel tests
that can be used to improve the prospects of experimentally discovering the
existence of a Br_{inv} with future data are proposed. These tests are based on
the combination of all visible channel Higgs signal strengths, and allow us to
examine the required reduction in experimental and theoretical errors in this
data that would allow a more significantly bounded invisible branching ratio to
be experimentally supported. We examine in some detail how our conclusions and
method are affected when a scalar resonance at this mass scale has couplings
deviating from the SM ones.Comment: 32pp, 15 figures v2: JHEP version, ref added & comment added after
  Eq.
N=2 Generalized Superconformal Quiver Gauge Theory

Four dimensional N=2 generalized superconformal field theory can be defined
by compactifying six dimensional (0,2) theory on a Riemann surface with regular
punctures. In previous studies, gauge coupling constant space is identified
with the moduli space of punctured Riemann surface M_{g,n}. We show that the
weakly coupled gauge group description corresponds to a stable nodal curve, and
the coupling space is actually the Deligne-Mumford compactification
\bar{M}_{g,n}. We also give an algorithm to determine the weakly coupled gauge
group and matter content in any duality frame.Comment: v2, reorganizing the materials, discussions on 2d CFT is remove
The linear multiplet and ectoplasm

In the framework of the superconformal tensor calculus for 4D N=2
supergravity, locally supersymmetric actions are often constructed using the
linear multiplet. We provide a superform formulation for the linear multiplet
and derive the corresponding action functional using the ectoplasm method (also
known as the superform approach to the construction of supersymmetric
invariants). We propose a new locally supersymmetric action which makes use of
a deformed linear multiplet. The novel feature of this multiplet is that it
corresponds to the case of a gauged central charge using a one-form potential
not annihilated by the central charge (unlike the standard N=2 vector
multiplet). Such a gauge one-form can be chosen to describe a variant nonlinear
vector-tensor multiplet. As a byproduct of our construction, we also find a
variant realization of the tensor multiplet in supergravity where one of the
auxiliaries is replaced by the field strength of a gauge three-form.Comment: 31 pages; v3: minor corrections and typos fixed, version to appear in
  JHE
Solving the Simplest Theory of Quantum Gravity

We solve what is quite likely the simplest model of quantum gravity, the
worldsheet theory of an infinitely long, free bosonic string in Minkowski
space. Contrary to naive expectations, this theory is non-trivial. We
illustrate this by constructing its exact factorizable S-matrix. Despite its
simplicity, the theory exhibits many of the salient features expected from more
mature quantum gravity models, including the absence of local off-shell
observables, a minimal length, a maximum achievable (Hagedorn) temperature, as
well as (integrable relatives of) black holes. All these properties follow from
the exact S-matrix. We show that the complete finite volume spectrum can be
reconstructed analytically from this S-matrix with the help of the
thermodynamic Bethe Ansatz. We argue that considered as a UV complete
relativistic two-dimensional quantum field theory the model exhibits a new type
of renormalization group flow behavior, "asymptotic fragility". Asymptotically
fragile flows do not originate from a UV fixed point.Comment: 32+4 pages, 1 figure, v2: typos fixed, published versio
Half-hypers and quivers

We study systematically the BPS spectra of N = 2 SYM coupled to half - hypermultiplets, the basic example being E7 SYM coupled to a half-hyper in the 56 irrepr. In order to do this, we determine the BPS quivers with superpotential of such N = 2 models using a new technique we introduce. The computation of the BPS spectra in the various chambers is then reduced to the Representation Theory of the resulting quivers. We use the quiver description to study the BPS spectrum at both strong and weak coupling. The following models are discussed in detail: SU(6) SYM coupled to a 1/2 20, SO(12) SYM coupled to a 1/2 32, and E7 SYM coupled to a 1/2 56. For models with gauge group SU(2) × SO(2n) and matter in the 1/2 (2, 2n) we find strongly coupled chambers with a BPS spectrum consisting of just finitely many hypermultiplets. © SISSA 2012
Supersymmetric Deformations of Maximally Supersymmetric Gauge Theories

We study supersymmetric and super Poincar\'e invariant deformations of
ten-dimensional super Yang-Mills theory and of its dimensional reductions. We
describe all infinitesimal super Poincar\'e invariant deformations of equations
of motion of ten-dimensional super Yang-Mills theory and its reduction to a
point; we discuss the extension of them to formal deformations. Our methods are
based on homological algebra, in particular, on the theory of L-infinity and
A-infinity algebras. The exposition of this theory as well as of some basic
facts about Lie algebra homology and Hochschild homology is given in
appendices.Comment: New results added. 111 page
Structure of Infrared Singularities of Gauge-Theory Amplitudes at Three
  and Four Loops

The infrared divergences of massless n-parton scattering amplitudes can be
derived from the anomalous dimension of n-jet operators in soft-collinear
effective theory. Up to three-loop order, the latter has been shown to have a
very simple structure: it contains pairwise color-dipole interactions among the
external partons, governed by the cusp anomalous dimension and a logarithm of
the kinematic invariants s_{ij}, plus a possible three-loop correlation
involving four particles, which is described by a yet unknown function of
conformal cross ratios of kinematic invariants. This function is constrained by
two-particle collinear limits and by the known behavior of amplitudes in the
high-energy limit. We construct a class of relatively simple functions
satisfying these constraints. We also extend the analysis to four-loop order,
finding that three additional four-particle correlations and a single
five-particle correlation appear, which again are governed by functions of
conformal cross ratios. Our results suggest that the dipole conjecture, which
states that only two-particle color-dipole correlations appear in the anomalous
dimension, may need to be generalized. We present a weaker form of the
conjecture, stating that to all orders in perturbation theory corrections to
the dipole formula are governed by functions of conformal cross ratios, and are
O(1/N_c^2) suppressed relative to the dipole term. If true, this conjecture
implies that the cusp anomalous dimension obeys Casimir scaling to all orders
in perturbation theory.Comment: 21 pages, 1 figur
Electroweak Cogenesis

We propose a simple renormalizable model of baryogenesis and asymmetric dark
matter generation at the electroweak phase transition. Our setup utilizes the
two Higgs doublet model plus two complex gauge singlets, the lighter of which
is stable dark matter. The dark matter is charged under a global symmetry that
is broken in the early universe but restored during the electroweak phase
transition. Because the ratio of baryon and dark matter asymmetries is
controlled by model parameters, the dark matter need not be light. Thus, new
force carriers are unnecessary and the symmetric dark matter abundance can be
eliminated via Higgs portal interactions alone. Our model places a rough upper
bound on the dark matter mass, and has implications for direct detection
experiments and particle colliders.Comment: 9 pages, 4 figure
P-V criticality in the extended phase space of Gauss-Bonnet black holes
  in AdS space

We study the $P-V$ criticality and phase transition in the extended phase
space of charged Gauss-Bonnet black holes in anti-de Sitter space, where the
cosmological constant appears as a dynamical pressure of the system and its
conjugate quantity is the thermodynamic volume of the black hole. The black
holes can have a Ricci flat ($k=0$), spherical ($k=1$), or hyperbolic ($k=-1$)
horizon. We find that for the Ricci flat and hyperbolic Gauss-Bonnet black
holes, no $P-V$ criticality and phase transition appear, while for the black
holes with a spherical horizon, even when the charge of the black hole is
absent, the $P-V$ criticality and the small black hole/large black hole phase
transition will appear, but it happens only in $d=5$ dimensions; when the
charge does not vanish, the $P-V$ criticality and the small black hole/large
phase transition always appear in $d=5$ dimensions; in the case of $d\ge 6$, to
have the $P-V$ criticality and the small black hole/large black hole phase
transition, there exists an upper bound for the parameter
$b=\widetilde{\alpha}|Q|^{-2/(d-3)}$, where $\tilde {\alpha}$ is the
Gauss-Bonnet coefficient and $Q$ is the charge of the black hole. We calculate
the critical exponents at the critical point and find that for all cases, they
are the same as those in the van der Waals liquid-gas system.Comment: 23 pages,9 figure
Isolating Prompt Photons with Narrow Cones

We discuss the isolation of prompt photons in hadronic collisions by means of
narrow isolation cones and the QCD computation of the corresponding cross
sections. We reconsider the occurence of large perturbative terms with
logarithmic dependence on the cone size and their impact on the fragmentation
scale dependence. We cure the apparent perturbative violation of unitarity for
small cone sizes, which had been noticed earlier in next-to-leading-order (NLO)
calculations, by resumming the leading logarithmic dependence on the cone size.
We discuss possible implications regarding the implementation of some hollow
cone variants of the cone criterion, which simulate the experimental difficulty
to impose isolation inside the region filled by the electromagnetic shower that
develops in the calorimeter.Comment: 19 pages, 2 figures, 4 table
Supersymmetric Hidden Sectors for Heterotic Standard Models

Within the context of the weakly coupled E8 x E8 heterotic string, we study
the hidden sector of heterotic standard model compactifications to
four-dimensions. Specifically, we present a class of hidden sector vector
bundles - composed of the direct sum of line bundles only - that, together with
an effective bulk five-brane, renders the heterotic standard model entirely N=1
supersymmetric. Two explicit hidden sectors are constructed and analyzed in
this context; one with the gauge group E7 x U(1) arising from a single line
bundle and a second with an SO(12) x U(1) x U(1) gauge group constructed from
the direct sum of two line bundles. Each hidden sector bundle is shown to
satisfy all requisite physical constraints within a finite region of the Kahler
cone. We also clarify that the first Chern class of the line bundles need not
be even in our context, as has often been imposed in the model building
literature.Comment: 32 pages, 4 figures. v2: corrected misplaced hyphen in the second
  author's name. v3: citations and clarifications adde
Partition Functions for Maxwell Theory on the Five-torus and for the
  Fivebrane on S1XT5

We compute the partition function of five-dimensional abelian gauge theory on
a five-torus T5 with a general flat metric using the Dirac method of quantizing
with constraints. We compare this with the partition function of a single
fivebrane compactified on S1 times T5, which is obtained from the six-torus
calculation of Dolan and Nappi. The radius R1 of the circle S1 is set to the
dimensionful gauge coupling constant g^2= 4\pi^2 R1. We find the two partition
functions are equal only in the limit where R1 is small relative to T5, a limit
which removes the Kaluza-Klein modes from the 6d sum. This suggests the 6d
N=(2,0) tensor theory on a circle is an ultraviolet completion of the 5d gauge
theory, rather than an exact quantum equivalence.Comment: v4, 37 pages, published versio
The Shape of Covariantly Smeared Sources in Lattice QCD

Covariantly smeared sources are commonly used in lattice QCD to enhance the
projection onto the ground state. Here we investigate the dependence of their
shape on the gauge field background and find that the presence of localized
concentrations of magnetic field can lead to strong distortions which reduce
the smearing radii achievable by iterative smearing prescriptions. In
particular, as $a\to 0$, iterative procedures like Jacobi smearing require
increasingly large iteration counts in order to reach physically-sized smearing
radii $r_{sm}\sim$ 0.5 fm, and the resulting sources are strongly distorted. To
bypass this issue, we propose a covariant smearing procedure (``free-form
smearing'') that allows us to create arbitrarily shaped sources, including in
particular Gaussians of arbitrary radius.Comment: 1+15 pages, 7 figures (24 pdf images
Restoring predictability in semiclassical gravitational collapse

Hawking showed that the radiation emitted from a classical collapsing shell
is thermal. Here, we show that a semiclassical collapsing shell emits radiation
that is only approximately thermal, with small but significant deviations. The
most important difference is the presence of small off-diagonal elements in the
radiation density matrix with a magnitude of order $1/\sqrt{S_{BH}}$, $S_{BH}$
being the Bekenstein-Hawking entropy of the incipient black hole. The
off-diagonal elements store the correlations between the collapsing shell and
the emitted radiation and allow information to continuously leak from the
collapsed body. The rate of escape of information is initially very small,
increasing to order one by the Page time, when the black hole has lost half its
original entropy. We show that, until the Page time, the radiation is almost
exactly thermal and that, from this time on, it begins to purify at an
increasing rate.Comment: 37 page
Asymptotically flat spacetimes in three-dimensional higher spin gravity

A consistent set of asymptotic conditions for higher spin gravity in three
dimensions is proposed in the case of vanishing cosmological constant. The
asymptotic symmetries are found to be spanned by a higher spin extension of the
BMS3 algebra with an appropriate central extension. It is also shown that our
results can be recovered from the ones recently found for asymptotically AdS3
spacetimes by virtue of a suitable gauge choice that allows to perform the
vanishing cosmological constant limit.Comment: 12 pages, no figures. v2: References added and typos corrected. A new
  appendix is also included. v3: Typos corrected. Matches published versio
More on the Hypercharge Portal into the Dark Sector

If the hidden sector contains more than one U(1) groups, additional dim-4
couplings (beyond the kinetic mixing) between the massive U(1) fields and the
hypercharge generally appear. These are of the form similar to the Chern-Simons
interactions. We study the phenomenology of such couplings including
constraints from laboratory experiments and implications for dark matter. The
hidden vector fields can play the role of dark matter whose characteristic
signature would be monochromatic gamma ray emission from the galactic center.
We show that this possibility is consistent with the LHC and other laboratory
constraints, as well as astrophysical bounds.Comment: 23 pages, 10 figure
126 GeV Higgs boson in the top-seesaw model

We consider a model of dynamical electroweak symmetry breaking built on the
idea of top-seesaw mechanism. The model features a fourth generation of
vector-like QCD quarks responsible for the origin of the top-seesaw mechanism
and leading to the natural explanation of the large splitting between the top
and bottom quark masses. Motivated by the LHC data on the couplings of the
Higgs boson, we include the entire third generation of Standard Model matter
fields into the model. We determine the low energy effective theory and the
resulting low energy spectrum of states, and constrain the model parameters
with constraints from the precision electroweak data and from the requirement
of a light scalar state with quantum numbers of the Standard Model Higgs boson.
Finally, we perform a global fit of the model parameters to the LHC Higgs data
and show that the model is equally viable as the Standard Model itself, and
predicts new states accessible at the LHC.Comment: 31 pages, 10 figures, references adde
Singlet Fermionic Dark Matter and the Electroweak Phase Transition

We consider a model with a gauge singlet Dirac fermion as a cold dark matter
candidate. The dark matter particle communicates with the Standard Model via a
gauge singlet scalar mediator that couples to the Higgs. The scalar mediator
also serves to create a tree-level barrier in the scalar potential which leads
to a strongly first order electroweak phase transition as required for
Electroweak Baryogenesis. We find a large number of models that can account for
all the dark matter and provide a strong phase transition while avoiding
constraints from dark matter direct detection, electroweak precision data, and
the latest Higgs data from the LHC. The next generation of direct detection
experiments could rule out a large region of the parameter space but can be
evaded in some regions when the Higgs-singlet mixing is very small.Comment: 9 pages, 6 figures. v2: figure captions updated, colour confusion
  fixed, no other changes. v3: references added, some clarification, now
  matches version published in JHE
Fits to SO(10) Grand Unified Models

We perform numerical fits of Grand Unified Models based on SO(10), using
various combinations of 10-, 120- and 126-dimensional Higgs representations.
Both the supersymmetric and non-supersymmetric versions are fitted, as well as
both possible neutrino mass orderings. In contrast to most previous works, we
perform the fits at the weak scale, i.e. we use RG evolution from the GUT
scale, at which the GUT-relations between the various Yukawa coupling matrices
hold, down to the weak scale. In addition, the right-handed neutrinos of the
seesaw mechanism are integrated out one by one in the RG running. Other new
features are the inclusion of recent results on the reactor neutrino mixing
angle and the Higgs mass (in the non-SUSY case). As expected from vacuum
stability considerations, the low Higgs mass and the large top-quark Yukawa
coupling cause some pressure on the fits. A lower top-quark mass, as sometimes
argued to be the result of a more consistent extraction from experimental
results, can relieve this pressure and improve the fits. We give predictions
for neutrino masses, including the effective one for neutrinoless double beta
decay, as well as the atmospheric neutrino mixing angle and the leptonic CP
phase for neutrino oscillations.Comment: 40 pages, 2 figures. Published versio
Gauge Dynamics and Topological Insulators

A non-abelian magnetic field in Yang-Mills theory induces the formation of a
"W-boson" vortex lattice. We study the propagation of fundamental fermions in
the presence of this lattice in 2+1 dimensions. We show that the spectrum for
massless fermions contains four topologically-protected Dirac points with
non-zero Bloch momentum. For massive fermions, we compute topological
invariants of the band structure and show that it is possible to realise a Z2
topological insulator within Yang-Mills theory.Comment: 28 pages + appendices, 5 figures. v2: Added comments on stability of
  lattice. Emphasised role of Higgs field. Added references v3: Further
  reference added. v4: Version to appear in JHE
Holographic isotropization linearized

The holographic isotropization of a highly anisotropic, homogeneous, strongly coupled, non-Abelian plasma was simplified in ref. [1] by linearizing Einstein"s equations around the final, equilibrium state. This approximation reproduces the expectation value of the boundary stress tensor with a 20% accuracy. Here we elaborate on these results and extend them to observables that are directly sensitive to the bulk interior, focusing for simplicity on the entropy production on the event horizon. We also consider next-to-leading-order corrections and show that the leading terms alone provide a better description of the isotropization process for the states that are furthest from equilibrium
Discrete flavor symmetries in D-brane models

We study the presence of discrete flavor symmetries in D-brane models of
particle physics. By analyzing the compact extra dimensions of these models one
can determine when such symmetries exist both in the context of intersecting
and magnetized D-brane constructions. Our approach allows to distinguish
between approximate and exact discrete symmetries, and it can be applied to
compactification manifolds with continuous isometries or to manifolds that only
contain discrete isometries, like Calabi-Yau three-folds. We analyze in detail
the class of rigid D-branes models based on a Z_2 x Z'_2 toroidal orientifold,
for which the flavor symmetry group is either the dihedral group D_4 or tensor
products of it. We construct explicit Pati-Salam examples in which families
transform in non-Abelian representations of the flavor symmetry group,
constraining Yukawa couplings beyond the effect of massive U(1) D-brane
symmetries.Comment: 46 pages + appendices, 7 figures. v2: typos corrected and references
  adde
Towards an understanding of jet substructure

We present first analytic, resummed calculations of the rates at which
widespread jet substructure tools tag QCD jets. As well as considering
trimming, pruning and the mass-drop tagger, we introduce modified tools with
improved analytical and phenomenological behaviours. Most taggers have double
logarithmic resummed structures. The modified mass-drop tagger is special in
that it involves only single logarithms, and is free from a complex class of
terms known as non-global logarithms. The modification of pruning brings an
improved ability to discriminate between the different colour structures that
characterise signal and background. As we outline in an extensive
phenomenological discussion, these results provide valuable insight into the
performance of existing tools and help lay robust foundations for future
substructure studies.Comment: 52 pages, 18 figures. Version to be published in JHEP: added an
  Appendix about Y-trimming and addressed several points raised by the refere
Mathieu Moonshine and N=2 String Compactifications

There is a `Mathieu moonshine' relating the elliptic genus of K3 to the
sporadic group M_{24}. Here, we give evidence that this moonshine extends to
part of the web of dualities connecting heterotic strings compactified on K3
\times T^2 to type IIA strings compactified on Calabi-Yau threefolds. We
demonstrate that dimensions of M_{24} representations govern the new
supersymmetric index of the heterotic compactifications, and appear in the
Gromov--Witten invariants of the dual Calabi-Yau threefolds, which are elliptic
fibrations over the Hirzebruch surfaces F_n.Comment: 28 pages; v2: minor changes, published versio