pinecone/core-2020-05-10-deduplication huggingface dataset:
Tetraquarks in the 1/N expansion and meson-meson resonances

Diquarks are found to have the right degrees of freedom to describe the
tetraquark poles in hidden-charm to open-charm meson-meson amplitudes. Compact
tetraquarks result as intermediate states in non-planar diagrams of the 1/N
expansion and the corresponding resonances are narrower than what estimated
before. The proximity of tetraquarks to meson-thresholds has an apparent role
in this analysis and, in the language of meson molecules, an halving rule in
the counting of states is obtained.Comment: 10 pages, 10 figures, references and comments added, minor
  corrections made, to appear in JHE
The perturbative QCD gradient flow to three loops

The gradient flow in QCD is treated perturbatively through
next-to-next-to-leading order in the strong coupling constant. The evaluation
of the relevant momentum and flow-time integrals is described, including
various means of validation. For the vacuum expectation value of the action
density, which turns out to be a useful quantity in lattice calculations, we
find a very well-behaved perturbative series through NNLO. Quark mass effects
are taken into account through NLO. The theoretical uncertainty due to
renormalization scale variation is significantly reduced with respect to LO and
NLO, as long as the flow time is smaller than about 0.1 fm.Comment: 25 pages, 6 figures, 3 tables. v2: typos fixed; matches published
  versio
All Tree-Level MHV Form Factors in $\mathcal{N}=4$ SYM from Twistor
  Space

We incorporate all gauge-invariant local composite operators into the
twistor-space formulation of N=4 SYM theory, detailing and expanding on ideas
we presented recently in arXiv:1603.04471. The vertices for these operators
contain infinitely many terms and we show how they can be constructed by taking
suitable derivatives of a light-like Wilson loop in twistor space and shrinking
it down to a point. In particular, these vertices directly yield the tree-level
MHV super form factors of all composite operators in N=4 SYM theory.Comment: 16+13 pages, 8 figures; v2: some clarifications added, matches
  journal versio
Holographic Chern-Simons Defects

We study SU(N) Yang-Mills-Chern-Simons theory in the presence of defects that
shift the Chern-Simons level from a holographic point of view by embedding the
system in string theory. The model is a D3-D7 system in Type IIB string theory,
whose gravity dual is given by the AdS soliton background with probe D7-branes
attaching to the AdS boundary along the defects. We holographically renormalize
the free energy of the defect system with sources, from which we obtain the
correlation functions for certain operators naturally associated to these
defects. We find interesting phase transitions when the separation of the
defects as well as the temperature are varied. We also discuss some
implications for the Fractional Quantum Hall Effect and for two-dimensional
QCD.Comment: 56 pages, 19 figures, v2: sign convention for CS level in terms of
  number of D7 branes switched, UV behavior of one and two point functions
  added in sec. 5.4.1 and 5.4.3, references added, typos correcte
Fermions in five-dimensional brane world models

In the present paper the fermion fields, living in the background of
five-dimensional warped brane world models with compact extra dimension, are
thoroughly examined. The Kaluza-Klein decomposition and isolation of the
physical degrees of freedom is performed for those five-dimensional fermion
field Lagrangians, which admit such a decomposition to be performed in a
mathematically consistent way and provide a physically reasonable
four-dimensional effective theory. It is also shown that for the majority of
five-dimensional fermion field Lagrangians there are no (at least rather
obvious) ways to perform the Kaluza-Klein decomposition consistently. Moreover,
in these cases one may expect the appearance of various pathologies in the
four-dimensional effective theory. Among the cases, for which the Kaluza-Klein
decomposition can be performed in a mathematically consistent way, the case,
which reproduces the Standard Model by the zero Kaluza-Klein modes most closely
regardless of the size of the extra dimension, is examined in detail in the
background of the Randall-Sundrum model.Comment: 42 pages, LaTeX. v2: minor corrections in the tex
Holographic Effective Field Theories

We derive the four-dimensional low-energy effective field theory governing
the moduli space of strongly coupled superconformal quiver gauge theories
associated with D3-branes at Calabi-Yau conical singularities in the
holographic regime of validity. We use the dual supergravity description
provided by warped resolved conical geometries with mobile D3-branes.
Information on the baryonic directions of the moduli space is also obtained by
using wrapped Euclidean D3-branes. We illustrate our general results by
discussing in detail their application to the Klebanov-Witten model.Comment: 56 pages; v2: minor changes, version published in JHE
A Flippon Related Singlet at the LHC II

We consider the 750 GeV diphoton resonance at the 13 TeV LHC in the ${\cal
F}$-$SU(5)$ model with a Standard Model (SM) singlet field which couples to
TeV-scale vector-like particles, dubbed $flippons$. This singlet field assumes
the role of the 750 GeV resonance, with production via gluon fusion and
subsequent decay to a diphoton via the vector-like particle loops. We present a
numerical analysis showing that the observed 8 TeV and 13 TeV diphoton
production cross-sections can be generated in the model space with realistic
electric charges and Yukawa couplings for light vector-like masses. We further
discuss the experimental viability of light vector-like masses in a General
No-Scale ${\cal F}$-$SU(5)$ model, offering a few benchmark scenarios in this
consistent GUT that can satisfy all experimental constraints imposed by the LHC
and other essential experiments.Comment: 16 Pages, 3 Tables; JHEP Versio
Extensions of Theories from Soft Limits

We study a variety of field theories with vanishing single soft limits. In
all cases, the structure of the soft limit is controlled by a larger theory,
which provides an extension of the original one by adding more fields and
interactions. Our main example is the $U(N)$ non-linear sigma model in its CHY
representation. Its extension is a theory in which the NLSM Goldstone bosons
interact with a cubic biadjoint scalar. Other theories we study and extend are
the special Galileon and Born-Infeld theory, including its maximally
supersymmetric version in four dimensions, the DBI-Volkov-Akulov theory. In all
the cases, we propose the CHY representation of the complete tree-level
S-matrix of the extended theories. In fact, CHY formulas are the key technique
for studying the single soft limit behavior of the original theories. As a
byproduct, we show that the tree-level S-matrix of the extended NLSM theory can
be constructed using a very compact BCFW-like recursion relation, where
physical poles are at most linear in the deformation parameter.Comment: 31 pages, 2 figures, 1 tabl
Holographic Quenches with a Gap

In order to holographically model quenches with a gapped final hamiltonian,
we consider a gravity-scalar theory in anti-de Sitter space with an infrared
hard wall. We allow a time dependent profile for the scalar field at the wall.
This induces an energy exchange between bulk and wall and generates an
oscillating scalar pulse. We argue that such backgrounds are the counterpart of
quantum revivals in the dual field theory. We perform a qualitative comparison
with the quench dynamics of the massive Schwinger model, which has been
recently analyzed using tensor network techniques. Agreement is found provided
the width of the oscillating scalar pulse is inversely linked to the energy
density communicated by the quench. We propose this to be a general feature of
holographic quenches.Comment: 19 pages, 17 figure
Low-Energy Lorentz Invariance in Lifshitz Nonlinear Sigma Models

This work is dedicated to the study of both large-$N$ and perturbative
quantum behaviors of Lifshitz nonlinear sigma models with dynamical critical
exponent $z=2$ in 2+1 dimensions. We discuss renormalization and
renormalization group aspects with emphasis on the possibility of emergence of
Lorentz invariance at low energies. Contrarily to the perturbative expansion,
where in general the Lorentz symmetry restoration is delicate and may depend on
stringent fine-tuning, our results provide a more favorable scenario in the
large-$N$ framework. We also consider supersymmetric extension in this
nonrelativistic situation.Comment: 28 pages, 4 figures, minor clarifications, typos corrected, published
  versio
Kappa-symmetry of superstring sigma model and generalized 10d
  supergravity equations

We determine the constraints imposed on the 10d target superspace geometry by
the requirement of classical kappa-symmetry of the Green-Schwarz superstring.
In the type I case we find that the background must satisfy a generalization of
type I supergravity equations. These equations depend on an arbitrary vector
X_a and imply the one-loop scale invariance of the GS sigma model. In the
special case when X_a is the gradient of a scalar \phi (dilaton) one recovers
the standard type I equations equivalent to the 2d Weyl invariance conditions
of the superstring sigma model. In the type II case we find a generalized
version of the 10d supergravity equations the bosonic part of which was
introduced in arXiv:1511.05795. These equations depend on two vectors \X_a and
K_a subject to 1st order differential relations (with the equations in the
NS-NS sector depending only on the combination X_a = \X_a + K_a). In the
special case of K_a=0 one finds that \X_a=\d_a \phi and thus obtains the
standard type II supergravity equations. New generalized solutions are found if
K_a is chosen to be a Killing vector (and thus they exist only if the metric
admits an isometry). Non-trivial solutions of the generalized equations
describe K-isometric backgrounds that can be mapped by T-duality to type II
supergravity solutions with dilaton containing a linear isometry-breaking term.
Examples of such backgrounds appeared recently in the context of integrable
\eta-deformations of AdS_n x S^n sigma models. The classical kappa-symmetry
thus does not, in general, imply the 2d Weyl invariance conditions for the GS
sigma model (equivalent to type II supergravity equations) but only weaker
scale invariance type conditions.Comment: 24 pages; v2: Note and references added; v3: Minor clarifications and
  references adde
Solving the Wrong Hierarchy Problem

Many theories require augmenting the Standard Model with additional scalar
fields with large order one couplings. We present a new solution to the
hierarchy problem for these scalar fields. We explore parity- and
$\mathbb{Z}_2$-symmetric theories where the Standard Model Higgs potential has
two vacua. The parity or $\mathbb{Z}_2$ copy of the Higgs lives in the minimum
far from the origin while our Higgs occupies the minimum near the origin of the
potential. This approach results in a theory with multiple light scalar fields
but with only a single hierarchy problem, since the bare mass is tied to the
Higgs mass by a discrete symmetry. The new scalar does not have a new hierarchy
problem associated with it because its expectation value and mass are generated
by dimensional transmutation of the scalar quartic coupling. The location of
the second Higgs minimum is not a free parameter, but is rather a function of
the matter content of the theory. As a result, these theories are extremely
predictive. We develop this idea in the context of a solution to the strong CP
problem. We show this mechanism postdicts the top Yukawa to be within $1
\sigma$ of the currently measured value and predicts scalar color octets with
masses in the range 9-200 TeV.Comment: 14 pages, 5 figure
Active Dirac Neutrinos via $SU(2)_L$ Doublets in 5d

We propose a new mechanism to generate minuscule active neutrino masses in a
five-dimensional~(5d) spacetime of an interval without introducing $SU(2)_L$
singlet neutrinos. Under asymmetric boundary conditions on the two end points,
a bulk mass for a 5d fermion allows a Dirac particle with a tiny mass
eigenvalue. Implementing this mechanism, which provides us a new tool for
building neutrino mass models, to the standard model gauge structure is
possible when all the gauge bosons and the Higgs boson are localized on one of
the branes.Comment: 23 pages, 1 figure, typos fixed, references added, additional
  discussions included, published version from JHEP (v2
Quantization condition from exact WKB for difference equations

A well-motivated conjecture states that the open topological string partition
function on toric geometries in the Nekrasov-Shatashvili limit is annihilated
by a difference operator called the quantum mirror curve. Recently, the complex
structure variables parameterizing the curve, which play the role of
eigenvalues for related operators, were conjectured to satisfy a quantization
condition non-perturbative in the NS parameter $\hbar$. Here, we argue that
this quantization condition arises from requiring single-valuedness of the
partition function, combined with the requirement of smoothness in the
parameter $\hbar$. To determine the monodromy of the partition function, we
study the underlying difference equation in the framework of exact WKB.Comment: 35 pages. v2 : minor changes, clarifications and references added.
  v3: typos correcte
The Scale-Invariant Scotogenic Model

We investigate a minimal scale-invariant implementation of the scotogenic
model and show that viable electroweak symmetry breaking can occur while
simultaneously generating one-loop neutrino masses and the dark matter relic
abundance. The model predicts the existence of a singlet scalar (dilaton) that
plays the dual roles of triggering electroweak symmetry breaking and sourcing
lepton number violation. Important constraints are studied, including those
from lepton flavor violating effects and dark matter direct-detection
experiments. The latter turn out to be somewhat severe, already excluding large
regions of parameter space. None the less, viable regions of parameter space
are found, corresponding to dark matter masses below (roughly) 10 GeV and above
200 GeV.Comment: 21 pages, 8 figures; v2 JHEP versio
Holographic interpretation of 1-point toroidal block in the
  semiclassical limit

We propose the holographic interpretation of the 1-point conformal block on a
torus in the semiclassical regime. To this end we consider the linearized
version of the block and find its coefficients by means of the perturbation
procedure around natural seed configuration corresponding to the zero-point
block. From the AdS/CFT perspective the linearized block is given by the
geodesic length of the tadpole graph embedded into the thermal AdS plus the
holomorphic part of the thermal AdS action.Comment: 15 pages, v2: more comments, typos corrected, acknowledgments added,
  journal versio
Resonant Diphoton Phenomenology Simplified

A framework is proposed to describe resonant diphoton phenomenology at hadron
colliders in full generality. It can be employed for a comprehensive
model-independent interpretation of the experimental data. Within the general
framework, few benchmark scenarios are defined as representative of the various
phenomenological options and/or of motivated new physics scenarios. Their usage
is illustrated by performing a characterization of the 750 GeV excess, based on
a recast of available experimental results.
  We also perform an assessment of which properties of the resonance could be
inferred, after discovery, by a careful experimental study of the diphoton
distributions. These include the spin J of the new particle and its dominant
production mode. Partial information on its CP-parity can also be obtained, but
only for $J\geq2$. The complete determination of the resonance CP properties
requires studying the pattern of the initial state radiation that accompanies
the resonant diphoton production.Comment: 36 pages, 13 figures; v2: discussion generalized, hidden assumption
  in v1 removed, conclusions unchanged; v3: figure 3 slightly modified, matches
  published versio
$C_T$ for higher derivative conformal fields and anomalies of (1,0)
  superconformal 6d theories

In arXiv:1510.02685 we proposed linear relations between the Weyl anomaly
$c_1, c_2, c_3$ coefficients and the 4 coefficients in the chiral anomaly
polynomial for (1,0) superconformal 6d theories. These relations were
determined up to one free parameter $\xi$ and its value was then conjectured
using some additional assumptions. A different value for $\xi$ was recently
suggested in arXiv:1702.03518 using a different method. Here we confirm that
this latter value is indeed the correct one by providing an additional data
point: the Weyl anomaly coefficient $c_3$ for the higher derivative (1,0)
superconformal 6d vector multiplet. This multiplet contains the 4-derivative
conformal gauge vector, 3-derivative fermion and 2-derivative scalar. We find
the corresponding value of $c_3$ which is proportional to the coefficient $C_T$
in the 2-point function of stress tensor using its relation to the first
derivative of the Renyi entropy or the second derivative of the free energy on
the product of thermal circle and 5d hyperbolic space. We present some general
results of computation of the Renyi entropy and $C_T$ from the partition
function on $S^1 \times \mathbb H^{d-1}$ for higher derivative conformal
scalars, spinors and vectors in even dimensions. We also give an independent
derivation of the conformal anomaly coefficients of the higher derivative
vector multiplet from the Seeley-DeWitt coefficients on an Einstein background.Comment: 30 pages. v2: minor corrections and refs added; v3: new section 6
  with independent confirmation of the main result for anomalies of higher
  derivative vector multiplet and new appendix
Glueballs on the Baryonic Branch of Klebanov-Strassler: dimensional
  deconstruction and a light scalar particle

Within gauge/gravity duality, we compute the scalar and tensor mass spectrum
in the boundary theory defined by the five-dimensional sigma-model coupled to
gravity obtained by constraining to eight scalars the truncation on T$^{1,1}$
that corresponds to the Papadopoulos-Tseytlin (PT) ansatz. We study
fluctuations around the 1-parameter family of backgrounds that lift to the
baryonic branch of the Klebanov-Strassler (KS) system, and interpolates between
the KS background and the Maldacena-Nunez one (CVMN). We adopt a gauge
invariant formalism in the treatment of the fluctuations that we interpret as
states of the dual theory. The tensor spectrum interpolates between the
discrete spectrum of the KS background and the continuum spectrum of the CVMN
background, in particular showing the emergence of a finite energy range
containing a dense set of states, as expected from dimensional deconstruction.
The scalar spectrum shows analogous features, and in addition it contains one
state that becomes parametrically light far from the origin along the baryonic
branch.Comment: 42 pages, 5 figures. Fixed references. Version accepted for
  publication in JHE
Adinkras From Ordered Quartets of BC${}_4$ Coxeter Group Elements and
  Regarding 1,358,954,496 Matrix Elements of the Gadget

We examine values of the Adinkra Holoraumy-induced Gadget representation
space metric over all possible four-color, four-open node, and four-closed node
adinkras. Of the 1,358,954,496 gadget matrix elements, only 226,492,416 are
non-vanishing and take on one of three values: $-1/3$, $1/3$, or $1$ and thus a
subspace isomorphic to a description of a body-centered tetrahedral molecule
emerges.Comment: LaTeX twice, 56pp, 30 tables, 5 figures, latest version includes link
  to updated code, minor corrections, and additional support about inequivalent
  representations and tetrahedral geometry comments added along with
  observations about similarity with results previously found by Nekraso
Centrally extended BMS4 Lie algebroid

We explicitly show how the field dependent 2-cocycle that arises in the
current algebra of 4 dimensional asymptotically flat spacetimes can be used as
a central extension to turn the BMS4 Lie algebra, or more precisely, the BMS4
action Lie algebroid, into a genuine Lie algebroid with field dependent
structure functions. Both a BRST formulation, where the extension appears as a
ghost number 2 cocyle, and a formulation in terms of vertex operator algebras
are introduced. The mapping of the celestial sphere to the cylinder then
implies zero mode shifts of the asymptotic part of the shear and of the news
tensor.Comment: 17 pages Latex file, typos corrected in version
Instanton corrections to twist-two operators

We present the calculation of the leading instanton contribution to the
scaling dimensions of twist-two operators with arbitrary spin and to their
structure constants in the OPE of two half-BPS operators in $\mathcal N=4$ SYM.
For spin-two operators we verify that, in agreement with $\mathcal N=4$
superconformal Ward identities, the obtained expressions coincide with those
for the Konishi operator. For operators with high spin we find that the leading
instanton correction vanishes. This arises as the result of a rather involved
calculation and requires a better understanding.Comment: 32 pages; v2: appendix B expanded, minor correction
T-branes and Matrix Models

We find that the equations describing T-branes with constant worldvolume
fields are identical to the equations found by Banks, Seiberg and Shenker
twenty years ago to describe longitudinal five-branes in the BFSS matrix model.
Besides giving new ways to construct T-brane solutions, this connection also
helps elucidate the physics of T-branes in the regime of parameters where their
worldvolume fields are larger than the string scale. We construct explicit
solutions to the Banks-Seiberg-Shenker equations and show that the
corresponding T-branes admit an alternative description as Abelian branes at
angles.Comment: 17 pages, 2 figures; v2: Minor changes. Version accepted for JHEP
  publicatio
Can X(3915) be the tensor partner of the X(3872)?

It has been proposed recently (Phys. Rev. Lett. 115 (2015), 022001) that the
charmoniumlike state named X(3915) and suggested to be a $0^{++}$ scalar, is
just the helicity-0 realisation of the $2^{++}$ tensor state $\chi_{c2}(3930)$.
This scenario would call for a helicity-0 dominance, which were at odds with
the properties of a conventional tensor charmonium, but might be compatible
with some exotic structure of the $\chi_{c2}(3930)$. In this paper, we
investigate, if such a scenario is compatible with the assumption that the
$\chi_{c2}(3930)$ is a $D^*\bar D^*$ molecular state - a spin partner of the
$X(3872)$ treated as a shallow bound state. We demonstrate that for a tensor
molecule the helicity-0 component vanishes for vanishing binding energy and
accordingly for a shallow bound state a helicity-2 dominance would be natural.
However, for the $\chi_{c2}(3930)$, residing about 100 MeV below the $D^*\bar
D^*$ threshold, there is no a priori reason for a helicity-2 dominance and thus
the proposal formulated in the above mentioned reference might indeed point at
a molecular structure of the tensor state. Nevertheless, we find that the
experimental data currently available favour a dominant contribution of the
helicity-2 amplitude also in this scenario, if spin symmetry arguments are
employed to relate properties of the molecular state to those of the X(3872).
We also discuss what research is necessary to further constrain the analysis.Comment: LaTeX2e, 23 pages, 2 figures, version to appear in JHE