pinecone/core-2020-05-10-deduplication huggingface dataset:
Second Stop and Sbottom Searches with a Stealth Stop

The top squarks (stops) may be the most wanted particles after the Higgs
boson discovery. The searches for the lightest stop have put strong constraints
on its mass. However, there is still a search gap in the low mass region if the
spectrum of the stop and the lightest neutralino is compressed. In that case,
it may be easier to look for the second stop since naturalness requires both
stops to be close to the weak scale. The current experimental searches for the
second stop are based on the simplified model approach with the decay modes
$\tilde{t}_2 \to \tilde{t}_1 Z$ and $\tilde{t}_2 \to \tilde{t}_1 h$. However,
in a realistic supersymmetric spectrum there is always a sbottom lighter than
the second stop, hence the decay patterns are usually more complicated than the
simplified model assumptions. In particular, there are often large branching
ratios of the decays $\tilde{t}_2 \to \tilde{b}_1 W$ and $\tilde{b}_1 \to
\tilde{t}_1 W$ as long as they are open. The decay chains can be even more
complex if there are intermediate states of additional charginos and
neutralinos in the decays. By studying several MSSM benchmark models at the 14
TeV LHC, we point out the importance of the multi-$W$ final states in the
second stop and the sbottom searches, such as the same-sign dilepton and
multilepton signals, aside from the traditional search modes. The observed
same-sign dilepton excesses at LHC Run 1 and Run 2 may be explained by some of
our benchmark models. We also suggest that the vector boson tagging and a new
kinematic variable may help to suppress the backgrounds and increase the signal
significance for some search channels. Due to the complex decay patterns and
lack of the dominant decay channels, the best reaches likely require a
combination of various search channels at the LHC for the second stop and the
lightest sbottom.Comment: 46 pages, 9 figures, updated experimental constraints and benchmark
  points after the ICHEP2016 data, published in JHE
Global Embedding of Fibre Inflation Models

We present concrete embeddings of fibre inflation models in globally
consistent type IIB Calabi-Yau orientifolds with closed string moduli
stabilisation. After performing a systematic search through the existing list
of toric Calabi-Yau manifolds, we find several examples that reproduce the
minimal setup to embed fibre inflation models. This involves Calabi-Yau
manifolds with $h^{1,1}= 3$ which are K3 fibrations over a $\mathbb{P}^1$ base
with an additional shrinkable rigid divisor. We then provide different
consistent choices of the underlying brane set-up which generate a
non-perturbative superpotential suitable for moduli stabilisation and string
loop corrections with the correct form to drive inflation. For each Calabi-Yau
orientifold setting, we also compute the effect of higher derivative
contributions and study their influence on the inflationary dynamics.Comment: 27 pages + appendix, 2 figures; references adde
Power corrections to the electromagnetic spectral function and the
  dilepton rate in QCD plasma within operator product expansion in D=4

We evaluate the electromagnetic spectral function in QCD plasma in a
nonperturbative background of in-medium quark and gluon condensates by
incorporating the leading order power corrections in a systematic framework
within the ambit of the operator product expansion in D=4 dimension. We
explicitly show that the mixing of the composite operators removes mass
singularities and renders Wilson coefficients finite and well defined. As a
spectral property, we then obtain the nonperturbative dilepton production rate
from QCD plasma. The operator product expansion automatically restricts the
dilepton rate to the intermediate mass range, which is found to be enhanced due
to the power corrections. We also compare our result with those from
nonperturbative calculations, e.g., lattice QCD and effective QCD models based
on Polyakov loop.Comment: 24 pages, 8 figures; Discussion added on OPE scales, version accepted
  in JHE
Nonthermal Gravitino Production after Large Field Inflation

We revisit the nonthermal gravitino production at the (p)reheating stage
after inflation. Particular attention is paid to large field inflation models
with a $\mathbb{Z}_2$ symmetry, for which the previous perturbative analysis is
inapplicable; and inflation models with a stabilizer superfield, which have not
been studied non-perturbatively. It is found that in single-superfield
inflation models (without the stabilizer field), nonthermal production of the
transverse gravitino can be cosmologically problematic while the abundance of
the longitudinal gravitino is small enough. In multi-superfield inflation
models (with the stabilizer field), production of the transverse and
longitudinal gravitinos is significantly suppressed, and they are
cosmologically harmless. We also clarify the relation between the background
field method used in the preheating context and the standard perturbative decay
method to estimate the gravitino abundance.Comment: 47 pages, 3 figures; v3, published version, extended discussions in
  Section 5 and Appendix
Leptonic Invariants, Neutrino Mass-Ordering and the Octant of
  $\theta_{23}$

We point out that leptonic weak-basis invariants are an important tool for
the study of the properties of lepton flavour models. In particular, we show
that appropriately chosen invariants can give a clear indication of whether a
particular lepton flavour model favours normal or inverted hierarchy for
neutrino masses and what is the octant of $\theta_{23}$. These invariants can
be evaluated in any conveniently chosen weak-basis and can also be expressed in
terms of neutrino masses, charged lepton masses, mixing angles and CP violation
phases.Comment: 10 pages, no figure
Precise predictions for the angular coefficients in Z-boson production
  at the LHC

The angular distributions of lepton pairs in the Drell-Yan process can
provide rich information on the underlying QCD production mechanisms. These
dynamics can be parameterised in terms of a set of frame dependent angular
coefficients, $A_{i=0,\ldots,7}$, which depend on the invariant mass,
transverse momentum, and rapidity of the lepton pair. Motivated by recent
measurements of these coefficients by ATLAS and CMS, and in particular by the
apparent violation of the Lam-Tung relation $A_0-A_2=0$, we perform a precision
study of the angular coefficients at $\mathcal{O}(\alpha_s^3)$ in perturbative
QCD. We make predictions relevant for $pp$ collisions at $\sqrt{s} = 8$ TeV,
and perform comparisons with the available ATLAS and CMS data as well as
providing predictions for a prospective measurement at LHCb. To expose the
violation of the Lam-Tung relationship we propose a new observable
$\Delta^\mathrm{LT} = 1-A_2/A_0$ that is more sensitive to the dynamics in the
region where $A_0$ and $A_2$ are both small. We find that the
$\mathcal{O}(\alpha_s^3)$ corrections have an important impact on the $p_{T,Z}$
distributions for several of the angular coefficients, and are essential to
provide an adequate description of the data. The compatibility of the available
ATLAS and CMS data is reassessed by performing a partial $\chi^2$ test with
respect to the central theoretical prediction which shows that
$\chi^2/N_\mathrm{data}$ is significantly reduced by going from
$\mathcal{O}(\alpha_s^2)$ to $\mathcal{O}(\alpha_s^3)$.Comment: 21 pages + refs, 13 figures. v2 reflects published JHEP version.
  Includes the evaluation of uncorrelated scale uncertainties when computing
  the angular coefficients. Plots and text updated accordingl
A Neutrinophilic 2HDM as a UV Completion for the Inverse Seesaw
  Mechanism

In Neutrinophilic Two Higgs Doublet Models, Dirac neutrino masses are
obtained by forbidding a Majorana mass term for the right-handed neutrinos via
a symmetry. We study a variation of such models in which that symmetry is taken
to be a local U(1), leading naturally to the typical Lagrangian of the inverse
seesaw scenario. The presence of a new gauge boson and of an extended scalar
sector result in a rich phenomenology, including modifications to Z, Higgs and
kaon decays as well as to electroweak precision parameters, and a pseudoscalar
associated to the breaking of lepton number.Comment: 21 pages, 2 figures, matches the published version in JHE
A Composite Axion from a Supersymmetric Product Group

A global $U(1)_\text{PQ}$ symmetry is protected from gravitational effects in
the s-confining $SU(N)^k$ product group theory with $A+4Q +N\overline{Q}$
matter. If the $SU(4)$ family symmetry is gauged and an appropriate tree-level
superpotential is added, then the dynamically generated superpotential
spontaneously breaks $SU(4)\times U(1)_\text{PQ} \rightarrow SU(3)_c$ and
produces a QCD axion. Small values of the $CP$-violating $\theta$ parameter are
then possible without any fine-tuning, as long as the product group is suitably
large. By introducing a second copy of the s-confining $SU(N)$ product group
also coupled to the gauged $SU(4)$, we find that values as small as $N=7$ are
consistent with $\bar\theta<10^{-10}$, even under the pessimistic assumption
that the dominant contribution to the axion quality is at tree level.Comment: 16 pages, 3 figures, 4 tables, 2 appendice
Holomorphic Scalar Portals and the OPE

Visible-sector SUSY-breaking effects are computed in terms of hidden-sector
correlation functions for generic holomorphic scalar portals. The solutions,
which are valid irrespective of the hidden-sector dynamics, are approximated
with the help of the operator product expansion (OPE). Indeed, for theories
with superconformal symmetry at high energy, the superconformal OPE formalism
can be used to disentangle the high-energy dynamics, encoded in the OPE
coefficients, from the low-energy dynamics of the SUSY-breaking vacuum
expectation values. A systematic method is proposed to compute the OPE
coefficients, using relations between correlation functions of superfields and
correlation functions of their quasi-primary component fields. The method,
which is quite general, could be useful in building models of gauge- or
gravity-mediated SUSY breaking and in analysing the viability of such models in
a systematic way.Comment: 1+22 pages, 1 figure, minor correction
Inconsistencies in Verlinde's emergent gravity

We point out that recent Verlinde's proposal of emergent gravity suffers from
some internal inconsistencies. The main idea in this proposal is to preserve
general relativity at short scales where numerous tests verified its validity,
but modify it on large scales where we meet puzzles raised by observations (in
particular dark matter), by using some entropic concepts. We first point out
that gravity as a conservative force is very difficult (if possible at all) to
portray as an entropic force. We then show that the derivation of the MOND
relation using the elastic strain idea is not self-consistent. When properly
done, Verlinde's elaborate procedure recovers the standard Newtonian gravity
instead of MOND.Comment: accepted for publication in JHE
Simultaneous Search for Extra Light and Heavy Higgs Bosons via Cascade
  Decays

Models with extended Higgs sectors can contain several additional Higgs
states, heavier or lighter than the SM Higgs boson. The couplings of lighter
extra states to SM particles can be strongly reduced, leading to small cross
sections for their direct production. Heavier extra states can have larger
couplings to SM particles and, moreover, have large branching fractions into
lighter extra states, notably into a SM-like Higgs boson accompagnied by
another Higgs state which can be lighter or heavier than 125$\sim$GeV.
Motivated by corresponding scenarios in the NMSSM we study the prospects for
the discovery or exclusion of cascade decays $ggF \to H_3 \to H_2 + H_1$ in the
$b\bar{b}b\bar{b}$, $b\bar{b}\tau\tau$ and $b\bar{b}\gamma\gamma$ final states
where either $H_1$ or $H_2$ can be SM-like. Significant regions of the NMSSM
parameter space can be tested by these searches. These are, however, not
confined to models of the NMSSM type.Comment: 34 pages, 64 figures, explanations, figures and reference added, to
  appear in JHE
Virtual signatures of dark sectors in Higgs couplings

Where collider searches for resonant invisible particles loose steam, dark
sectors might leave their trace as virtual effects in precision observables.
Here we explore this option in the framework of Higgs portal models, where a
sector of dark fermions interacts with the standard model through a strong
renormalizable coupling to the Higgs boson. We show that precise measurements
of Higgs-gauge and triple Higgs interactions can probe dark fermions up to the
TeV scale through virtual corrections. Observation prospects at the LHC and
future lepton colliders are discussed for the so-called singlet-doublet model
of Majorana fermions, a generalization of the bino-higgsino scenario in
supersymmetry. We advocate a two-fold search strategy for dark sectors through
direct and indirect observables.Comment: 20 pages, 7 figures, 1 tabl
Search for a light pseudoscalar Higgs boson produced in association with
  bottom quarks in pp collisions at sqrt(s) = 8 TeV

A search for a light pseudoscalar Higgs boson (A) produced in association
with bottom quarks and decaying into a muon pair is reported. The search uses
19.7 inverse femtobarns of proton-proton collisions at a center-of-mass energy
of 8 TeV, collected by the CMS experiment. No signal is observed in the dimuon
mass range from 25 to 60 GeV. Upper limits on the cross section times branching
fraction, sigma(pp to b bbar A) B(A to mu mu), are set.Comment: Replaced with the published version. Added the journal reference and
  DOI. All the figures and tables can be found at
  http://cms-results.web.cern.ch/cms-results/public-results/publications/HIG-15-009
  (CMS Public Pages
No radiative generation of Chern-Simons-like term in Lorentz-violating
  QED: dealing with IR divergences

The issue intensively claimed in the literature on the generation of a
CPT-odd and Lorentz violating Chern-Simons-like term by radiative corrections
owing to a CPT violating interaction -- the axial coupling of fermions with a
constant vector field $b_\m$ -- is mistaken. The presence of massless gauge
field triggers IR divergences that might show up from the UV subtractions,
therefore, so as to deal with the (actual physical) IR divergences, the
Lowenstein-Zimmermann subtraction scheme, in the framework of BPHZL
renormalization method, has to be adopted. The proof on the non generation of
such a Chern-Simons-like term is done, independent of any kind of
regularization scheme, at all orders in perturbation theory.Comment: In honor of Prof. Manfred Schweda (1939-2017). Work presented at the
  XXXVIII National Meeting on Particle Physics and Fields, September 18-22,
  2017 - Passa Quatro - Minas Gerais - Brazil. Reference [46] correcte
Poisson-Lie duals of the eta deformed symmetric space sigma model

Poisson-Lie dualising the eta deformation of the G/H symmetric space sigma
model with respect to the simple Lie group G is conjectured to give an analytic
continuation of the associated lambda deformed model. In this paper we
investigate when the eta deformed model can be dualised with respect to a
subgroup G_0 of G. Starting from the first-order action on the complexified
group and integrating out the degrees of freedom associated to different
subalgebras, we find it is possible to dualise when G_0 is associated to a
sub-Dynkin diagram. Additional U_1 factors built from the remaining Cartan
generators can also be included. The resulting construction unifies both the
Poisson-Lie dual with respect to G and the complete abelian dual of the eta
deformation in a single framework, with the integrated algebras unimodular in
both cases. We speculate that extending these results to the path integral
formalism may provide an explanation for why the eta deformed AdS_5 x S^5
superstring is not one-loop Weyl invariant, that is the couplings do not solve
the equations of type IIB supergravity, yet its complete abelian dual and the
lambda deformed model are.Comment: 37 pages, v2: minor change
The Other Fermion Compositeness

We discuss the only two viable realizations of fermion compositeness
described by a calculable relativistic effective field theory consistent with
unitarity, crossing symmetry and analyticity: chiral-compositeness vs
goldstino-compositeness. We construct the effective theory of $\mathcal{N}$
Goldstini and show how the Standard Model can emerge from this dynamics. We
present new bounds on either type of compositeness, for quarks and leptons,
using dilepton searches at LEP, dijets at the LHC, as well as low-energy
observables and precision measurements. Remarkably, a scale of compositeness
for Goldstino-like electrons in the 2 TeV range is compatible with present
data, and so are Goldstino-like first generation quarks with a compositeness
scale in the 10 TeV range. Moreover, assuming maximal $R$-symmetry,
goldstino-compositeness of both right- and left-handed quarks predicts exotic
spin-1/2 colored sextet particles that are potentially within the reach of the
LHC.Comment: 32 pages on how Thomson might have discovered supersymmetry; v2: few
  typos fixed and comments adde
Integrability and Black-Hole Microstate Geometries

We examine some recently-constructed families of asymptotically-AdS$_3
\times$S$^3$ supergravity solutions that have the same charges and mass as
supersymmetric D1-D5-P black holes, but that cap off smoothly with no horizon.
These solutions, known as superstrata, are quite complicated, however we show
that, for an infinite family of solutions, the null geodesic problem is
completely integrable, due to the existence of a non-trivial conformal Killing
tensor that provides a quadratic conservation law for null geodesics. This
implies that the massless scalar wave equation is separable. For another
infinite family of solutions, we find that there is a non-trivial conformal
Killing tensor only when the left-moving angular momentum of the massless
scalar is zero. We also show that, for both these families, the metric degrees
of freedom have the form they would take if they arose from a consistent
truncation on S$^3$ down to a (2+1)-dimensional space-time. We discuss some of
the broader consequences of these special properties for the physics of these
black-hole microstate geometries.Comment: 24 pages, 1 figur
Visible neutrino decay in the light of appearance and disappearance long
  baseline experiments

We investigate the present constraints from MINOS and T2K experiments for the
neutrino decay scenario induced by non-diagonal couplings of Majorons to
neutrinos. As novelty, on top of the typical invisible decay prescription, we
add the contribution of visible decay, where final products can be observed.
This new effect depends on the nature of the neutrino - Majoron coupling, which
can be of scalar or pseudoscalar type. Using the combination of disappearance
data from MINOS and disappearance and appearance data from T2K, for normal
ordering, we constrain the decay parameter $\alpha\equiv E\,\Gamma$ for the
heaviest neutrino, where $E$ and $\Gamma$ are the neutrino energy and width,
respectively. We find that when considering visible decay within appearance
data, one can improve current neutrino long-baseline constraints up to $\alpha<
\mathcal{O}(10^{-5})$ eV$^2$, at 90\% C.L., for both kinds of couplings, which
is better by one order of magnitude compared to previous bounds.Comment: 29 pages, 8 figures, 3 appendices; v2: Corrected errors, version
  accepted for publication in JHE
Modular properties of 6d (DELL) systems

If super-Yang-Mills theory possesses the exact conformal invariance, there is
an additional modular invariance under the change of the complex bare charge
$\tau = \frac{\theta}{2\pi}+ \frac{4\pi\imath}{g^2}\longrightarrow
-\frac{1}{\tau}$. The low-energy Seiberg-Witten prepotential ${\cal F}(a)$,
however, is not explicitly invariant, because the flat moduli also change $a
\longrightarrow a_D = \partial{\cal F}/\partial a$. In result, the prepotential
is not a modular form and depends also on the anomalous Eisenstein series
$E_2$. This dependence is usually described by the universal MNW modular
anomaly equation. We demonstrate that, in the $6d$ $SU(N)$ theory with {\it
two} independent modular parameters $\tau$ and $\hat \tau$, the modular anomaly
equation changes, because the modular transform of $\tau$ is accompanied by an
($N$-dependent!) shift of $\hat\tau$ and vice versa. This is a new peculiarity
of double-elliptic systems, which deserves further investigation.Comment: 23 page
A combined analysis of PandaX, LUX, and XENON1T experiments within the
  framework of dark matter effective theory

Weakly interacting massive particles are a widely well-probed dark matter
candidate by the dark matter direct detection experiments. Theoretically, there
are a large number of ultraviolet completed models that consist of a weakly
interacting massive particle dark matter. The variety of models makes the
comparison with the direct detection data complicated and often non-trivial. To
overcome this, in the non-relativistic limit, the effective theory was
developed in the literature which works very well to significantly reduce the
complexity of dark matter-nucleon interactions and to better study the nuclear
response functions. In the effective theory framework for a spin-1/2 dark
matter, we combine three independent likelihood functions from the latest
PandaX, LUX, and XENON1T data, and give a joint limit on each effective
coupling. The astrophysical uncertainties of the dark matter distribution are
also included in the likelihood. We further discuss the isospin violating cases
of the interactions. Finally, for both dimension-five and dimension-six
effective theories above the electroweak scale, we give updated limits of the
new physics mass scales.Comment: 33 pages, 11 figures, PandaX run10 data included and version accepted
  in JHEP, "code is available at the LikeDM website,
  https://likedm.hepforge.org/
$N=1$ Supergravitational Heterotic Galileons

Heterotic $M$-theory consists of a five-dimensional manifold of the form
$S^1/\mathbf{Z}_2 \times M_{4}$. It has been shown that one of the two orbifold
planes, the "observable" sector, can have a low energy particle spectrum which
is precisely the $N=1$ supersymmetric standard model with three right-handed
neutrino chiral supermultiplets. The other orbifold plane constitutes a
"hidden" sector which, since its communication with the observable sector is
suppressed, will be ignored in this paper. However, the finite fifth-dimension
allows for the existence of three-brane solitons which, in order to render the
vacuum anomaly free, must appear. That is, heterotic $M$-theory provides a
natural framework for brane-world cosmological scenarios coupled to realistic
particle physics. The complete worldvolume action of such three-branes is
unknown. Here, treating these solitons as probe branes, we construct their
scalar worldvolume Lagrangian as a derivative expansion of the heterotic DBI
action. In analogy with similar calculations in the $M_{5}$ and $AdS_{5}$
context, this leads to the construction of "heterotic Galileons". However,
realistic vacua of heterotic $M$-theory are necessarily $N=1$ supersymmetric in
four dimensions. Hence, we proceed to supersymmetrize the three-brane
worldvolume action, first in flat superspace and then extend the results to
$N=1$ supergravity. Such a worldvolume action may lead to interesting
cosmology, such as "bouncing" universe models, by allowing for the violation of
the Null Energy Condition (NEC).Comment: Version 3: Typos corrected, updated to be consistent with journal
  version. 39 pages, 4 figure