
Boosting the $H\to$ invisibles searches with $Z$ boson polarization. (arXiv:1809.07327v1 [hepph])
Authors: Dorival Goncalves, Junya Nakamura
It is argued that, in $H \to $ invisibles searches with $Z(\ell\ell)H$
associated production at the LHC, the signal efficiency can be sensibly
improved via a detailed study of the $Z$ boson polarization, discriminating
between the signal and the dominantirreducible $Z(\ell\ell)Z(\nu\nu)$
background. We first present a comprehensive polarization study, obtaining the
complete set of angular coefficients $A_i$ in the CollinsSoper reference frame
and identifying the dominant phenomenological effects. Then, we show the
results for a realistic Monte Carlo study to $H\to$ invisibles, taking the
polarization analysis into account. We obtain about $20\%$ improvement in the
upper bound for the branching ratio of the Higgs boson to invisible particles,
assuming $300\ \mathrm{fb}^{1}$ of data at the 13 TeV LHC.

Detecting a Boosted Diboson Resonance. (arXiv:1809.07334v1 [hepph])
Authors: Kaustubh Agashe, Jack H. Collins, Peizhi Du, Sungwoo Hong, Doojin Kim, Rashmish K. Mishra
New light scalar particles in the mass range of hundreds of GeV, decaying
into a pair of $W/Z$ bosons can appear in several extensions of the SM. The
focus of collider studies for such a scalar is often on its direct production,
where the scalar is typically only mildly boosted. The observed $W/Z$ are
therefore wellseparated, allowing analyses for the scalar resonance in a
standard fashion as a lowmass diboson resonance. In this work we instead focus
on the scenario where the direct production of the scalar is suppressed, and it
is rather produced via the decay of a significantly heavier (a few TeV mass)
new particle, in conjunction with SM particles. Such a process results in the
scalar being highly boosted, rendering the $W/Z$'s from its decay merged. The
final state in such a decay is a "fat" jet, which can be either fourpronged
(for fully hadronic $W/Z$ decays), or may be like a $W/Z$ jet, but with leptons
buried inside (if one of the $W/Z$ decays leptonically). In addition, this fat
jet has a jet mass that can be quite different from that of the $W/Z$/Higgs/top
quarkinduced jet, and may be missed by existing searches. In this work, we
develop dedicated algorithms for tagging such multilayered "boosted dibosons"
at the LHC. As a concrete application, we discuss an extension of the standard
warped extradimensional framework where such a light scalar can arise. We
demonstrate that the use of these algorithms gives sensitivity in mass ranges
that are otherwise poorly constrained.

Inflating to the Weak Scale. (arXiv:1809.07338v1 [hepph])
Authors: Michael Geller, Yonit Hochberg, Eric Kuflik
We present a new solution to the hierarchy problem, where the Higgs mass is
at its observed electroweak value because such a patch inflates the most in the
early universe. If the Higgs mass depends on a field undergoing quantum
fluctuations during inflation, then inflation will fill the universe with the
Higgs mass that corresponds to the largest vacuum energy. The hierarchy problem
is solved if the maximum vacuum energy occurs for the observed Higgs mass. We
demonstrate this notion with a proofofprinciple model containing an axion, a
modulus field and the Higgs, and show that inflation can be responsible for the
weak scale.

Phenomenology of the inflationinspired NMSSM at the electroweak scale. (arXiv:1809.07371v1 [hepph])
Authors: Wolfgang Gregor Hollik, Stefan Liebler, Gudrid MoortgatPick, Sebastian Paßehr, Georg Weiglein
The concept of Higgs inflation can be elegantly incorporated in the
NexttoMinimal Supersymmetric Standard Model (NMSSM). A linear combination of
the two Higgsdoublet fields plays the role of the inflaton which is
nonminimally coupled to gravity. This nonminimal coupling appears in the
lowenergy effective superpotential and changes the phenomenology at the
electroweak scale. While the field content of the inflationinspired model is
the same as in the NMSSM, there is another contribution to the $\mu$ term in
addition to the vacuum expectation value of the singlet. We explore this
extended parameter space and point out scenarios with phenomenological
differences compared to the pure NMSSM. A special focus is set on the
electroweak vacuum stability and the parameter dependence of the Higgs and
neutralino sectors. We highlight regions which yield a SMlike $125\,$GeV Higgs
boson compatible with the experimental observations and are in accordance with
the limits from searches for additional Higgs bosons. Finally, we study the
impact of the nonminimal coupling to gravity on the Higgs mixing and in turn
on the decays of the Higgs bosons in this model.

Bulk observables in the LHC 5.02 TeV Pb+Pb collisions within the integrated HydroKinetic Model. (arXiv:1809.07400v1 [hepph])
Authors: V. M. Shapoval, Yu. M. Sinyukov
The paper is devoted to the description and prediction of various bulk
observables in the Pb+Pb collisions at the LHC energy $\sqrt{s_{NN}}=5.02$ TeV
within the integrated hydrokinetic model (iHKM). Sensitivity of the results to
the choice of the appropriate model parameter values is also investigated. It
is found that changing of the relaxation time and the rate of thermalization,
which characterize the prethermal stage of the matter evolution, as well as
switching to another equation of state at the hydrodynamic stage and the
corresponding hadronization temperature, does not destroy the results, if
simultaneously one provides an appropriate adjusting of the initial time for
the superdense matter formation and related maximal initial energy density.

New Scalar Field Quartessence. (arXiv:1809.07409v1 [grqc])
Authors: Robert Brandenberger, Rodrigo R. Cuzinatto, Jürg Fröhlich, Ryo Namba
We propose a cosmological scenario involving a single scalar field,
$\varphi$, that is a source of Dark Matter as well as Dark Energy. The
Lagrangian density of $\varphi$ contains a second field $\chi$, for simplicity
assumed to be a scalar. For fixed values of $\chi$, the potential of $\varphi$
decays exponentially at large positive $\varphi$values. While $\varphi$ is not
coupled to Standard Model fields, $\chi$ is assumed to couple to them. Hence,
the Green functions of $\chi$ depend on the temperature of the local
equilibrium in the expanding universe. We assume that the coupling of $\chi$ to
$\varphi$ is such that, at temperatures larger than some critical temperature
$T_c$, $\varphi$ is trapped near the origin, and excitations of $\varphi$ about
the origin form Dark Matter. After a phase transition at the temperature $T_c$,
the trapping force disappears and $\varphi$ rolls towards large field values. A
homogenous component of $\varphi$ appears and acts as Dark Energy. Within
overdense regions, such as galaxies and galaxy clusters, the kinetic
temperature is sufficiently high such that the phase transition does not occur.
Thus, at the present time, $\varphi$ can decribe both Dark Energy and Dark
Matter.

The Role of Mesons in Muon g2. (arXiv:1809.07413v1 [hepph])
Authors: Fred Jegerlehner
The muon anomaly $a_\mu=(g_\mu2)/2$ showing a persisting 3 to 4 $\sigma$
deviation between the SM prediction and the experiment is one of the most
promising signals for physics beyond the SM. As is well known, the hadronic
uncertainties are limiting the accuracy of the Standard Model prediction.
Therefore a big effort is going on to improve the evaluations of hadronic
effects in order to keep up with the 4fold improved precision expected from
the new Fermilab measurement in the near future. A novel complementary type
experiment planned at JPARC in Japan, operating with ultra cold muons, is
expected to be able to achieve the same accuracy but with completely different
systematics. So exciting times in searching for New Physics are under way. I
discuss the role of meson physics in calculations of the hadronic part of the
muon g2. The improvement is expected to substantiate the present deviation
$\Delta a_\mu^{\rm New \ Physics}=\Delta a_\mu^{\rm Experiment} \Delta
a_\mu^{\rm Standard \ Model}$ to a 6 to 10 standard deviation effect, provided
hadronic uncertainties can be reduce by a factor two. This concerns the
hadronic vacuum polarization as well as the hadronic lightbylight scattering
contributions, both to a large extent determined by the low lying meson
spectrum. Better meson production data and progress in modeling meson form
factors could greatly help to improve the precision and reliability of the SM
prediction of $a_\mu$ and thereby provide more information on what is missing
in the SM.

Multipartite Dark Matter with Scalars, Fermions and signatures at LHC. (arXiv:1809.07474v1 [hepph])
Authors: Subhaditya Bhattacharya, Purusottam Ghosh, Narendra Sahu
Basic idea of this analysis is to achieve a twocomponent dark matter (DM)
framework composed of a scalar and a fermion, with nonnegligible DMDM
interaction contributing to thermal freeze out (hence relic density), but
hiding them from direct detection bounds. We therefore augment the Standard
Model (SM) with a scalar singlet ($S$) and three vectorlike fermions: two
singlets ($\chi_1,\chi_2$) and a doublet ($N$). Stability of the two DM
components is achieved by a discrete $\mathcal{Z}_2 \times
{\mathcal{Z}^\prime}_2$ symmetry, under which the additional fields transform
suitably. Fermion fields having same $\mathcal{Z}_2 \times
{\mathcal{Z}^\prime}_2$ charge ($N,\chi_1$ in the model) mix after electroweak
symmetry breaking (EWSB) and the lightest component becomes one of the DM
candidates, while scalar singlet $S$ is the other DM component connected to
visible sector by Higgs portal coupling. The heavy fermion ($\chi_2$) plays the
role of mediator to connect the two DM candidates through Yukawa interaction.
This opens up a large parameter space for the heavier DM component through
DMDM conversion. Hadronically quiet dilepton signature, arising from the
fermion dark sector, can be observed at Large Hadron Collider (LHC) aided by
the presence of a lighter scalar DM component, satisfying relic density and
direct search bounds through DMDM conversion.

New narrow nucleon resonances $N^{\ast}(1685)$ and $N^{\ast}(1726)$ within the chiral quarksoliton model. (arXiv:1809.07489v1 [hepph])
Authors: GhilSeok Yang, HyunChul Kim
We investigate the strong and radiative decay widths of the narrow nucleon
resonances $N^*(1685)$ and $N^{\ast}(1726)$ within the framework of the SU(3)
chiral quarksoliton model. All the relevant parameters are taken from those
used to describe the properties of the baryon octet and decuplet in previous
works. The masses of the antidecuplet nucleon and the eikosiheptaplet (27plet)
nucleon with spin 3/2 are determined respectively to be $(1690.2\pm 10.5)\,
\mathrm{MeV}$ and $(1719.6\pm7.4)\,\mathrm{MeV}$. The decay width for
$N^{\ast}(1685)\to \eta + N$ is found to be approximately three times larger
than that for $N^{\ast}(1685)\to \pi + N$. The width of the decay
$N^{\ast}\left(1726\right)3/2^+\to \eta +N$ is even about 31 times larger than
that of $N^{\ast}\left(1726\right)3/2^+\to \pi + N$. The ratio of the radiative
decays for $N^*(1685)$ is obtained to be
$\Gamma_{nn^*(1685)}/\Gamma_{pp^*(1685)}=8.62\pm3.45$ which explains very well
the neutron anomaly. In contrast, we find
$\Gamma_{pp^*(1726)}/\Gamma_{nn^*(1726)}=3.72\pm0.64$, which indicates that the
production of $N^*(1726)$ is more likely to be observed in the proton channel.
We also examined the decay modes of these narrow nucleon resonances with the
strangeness hadrons involved.

A chiral SU(4) explanation of the $b\to s$ anomalies. (arXiv:1809.07562v1 [hepph])
Authors: Shyam Balaji, Robert Foot, Michael A. Schmidt
We propose a variant of the PatiSalam model, with gauge group $SU(4)_C\times
SU(2)_L\times U(1)_{Y'}$, in which the chiral lefthanded quarks and leptons
are unified into a $\underline{4}$ of $SU(4)_C$, while the righthanded quarks
and leptons have quite a distinct treatment. The $SU(4)_C$ leptoquark gauge
bosons can explain the measured deviation of lepton flavour universality in the
rare decays: $\bar B \to \bar K^{(*)}\bar\ell\ell, \ell=\mu,e$ (taken as a hint
of new physics). The model satisfies the relevant experimental constraints and
makes predictions for the important $B$ and $\tau$ decays. These predictions
will be tested at the LHCb and Belle II experiments when increased statistics
become available.

Transport responses from rate of decay and scattering processes in the NambuJonaLasinio model. (arXiv:1809.07594v1 [nuclth])
Authors: Sabyasachi Ghosh, Fernando E. Serna, Aman Abhishek, Gastao Krein, Hiranmaya Mishra
We have calculated quark and antiquark relaxation time by considering
different possible elastic and inelastic scatterings in the medium. Comparative
role of these elastic and inelastic scatterings on different transport
coefficients are explored. The quarkmeson effective interaction Lagrangian
density in the framework of NambuJonaLasinio model is used for calculating
both type of scatterings. Owing to a kinetic threshold, inelastic scatterings
can only exist beyond the Mott line in temperature and chemical potential
plane, whereas elastic scatterings occur in the entire plane. Interestingly,
the strength of inelastic scatterings near and above Mott line becomes so
strong that medium behaves like a perfect fluid, in that all transport
coefficients become very small.

Pion and constituent quarks strong form factors: a dynamical approach. (arXiv:1809.07608v1 [hepph])
Authors: Fabio L. Braghin
Form factors for pions interactions with constituent quarks are investigated
as the leading effective couplings obtained from a one loop background field
method applied to a global color model. Two pion field definitions are
considered and the resulting pion and constituent quark form factors are
expressed in terms of components of the quark and gluon propagators. Numerical
results for different quark effective masses and two different nonperturbative
gluon propagators are investigated. The corresponding averaged quadratic radii
are also presented as functions of the quark effective mass.

Hadron Vacuum Polarization from application of DSEs with intended contours inspired by GribovStingl conjecture of analytical confinement  Part I. (arXiv:1809.07644v1 [hepph])
Authors: Vladimir Sauli
Within the quark and gluonic degrees of freedom the hadronic vacuum
polarization (HVP) is calculated for the spacelike as well as for the timelike
momenta. For this purpose an oldfashionable strategy of the Gauge Technique,
however within a new integral representations for Green's function is used to
find QCD propagators and vertices. The functional method with a small admixture
of complex conjugated poles (a GribovStingl interaction) provides confining
solution for the propagator of light quarks. The Feynman paramaterization
method is extended to nonperturbative QCD via truncated system of
DysonSchwinger equations (DSEs), which ensures manifestly correct analytical
continuation between the Minkowski and the Euclidean space. The later 4d space
is used for an analytical momentum integration of DSEs system. While the
GribovStingl conjecture offers a tempting explanation of confinement, an
unnatural fine tuning is needed to avoid a potential conflict between the
Unitarity and the renormalizability of the Standard Model. The paper is divided
into two parts, the first part is more introductory and it provides the first
result as well. The second part is devoted to technical details, proofs as well
as it shows results based on slightly different approximation of DSEs system.

Total and differential cross sections for Higgs and topquark production. (arXiv:1809.07651v1 [hepph])
Authors: Nikolaos Kidonakis
I present theoretical calculations for Higgsboson and topquark production,
including highorder softgluon corrections. I discuss chargedHiggs production
in association with a top quark or a $W$ boson, as well as singletop and
topantitop production. Total cross sections as well as transversemomentum and
rapidity distributions of the top quark or the Higgs boson are presented for
various LHC energies.

ReSyst: a novel technique to Reduce the Systematic uncertainty for precision measurements. (arXiv:1809.07700v1 [physics.dataan])
Authors: Petra Van Mulders
We are in an era of precision measurements at the Large Hadron Collider. The
precision that can be achieved on some of the measurements is limited however
due to large systematic uncertainties. This paper introduces a new technique to
reduce the systematic uncertainty by quantifying the systematic impact of
single events and correlating it with event observables to identify parts of
the phase space that are more sensitive to systematic effects. A proof of
concept is presented by means of a simplified top quark mass estimator applied
on simulated events. Even without a thorough optimization, it is shown that the
total systematic uncertainty can be reduced by a factor of at least two.

Benchmarking the Inert Doublet Model for e+ e colliders. (arXiv:1809.07712v1 [hepph])
Authors: Jan Kalinowski, Wojciech Kotlarski, Tania Robens, Dorota Sokolowska, Aleksander Filip Zarnecki
In this short note we present benchmarks for the Inert Doublet Model, a Two
Higgs Doublet Model with a dark matter candidate. They are consistent with
current constraints on direct detection, including the most recent bounds from
the XENON1T experiment and relic density of dark matter, as well as with known
collider and lowenergy limits. We focus on parameter choices that promise
detectable signals at lepton colliders via pair production of H+H and HA. For
these we choose a large variety of benchmark points with different kinematic
features, leading to distinctly different final states in order to cover the
large variety of collider signatures that can result from the model.

Oscillons in HigherDerivative Effective Field Theories. (arXiv:1809.07724v1 [hepth])
Authors: Jeremy Sakstein, Mark Trodden
We investigate the existence and behavior of oscillons in theories in which
higher derivative terms are present in the Lagrangian, such as galileons. Such
theories have emerged in a broad range of settings, from higherdimensional
models, to massive gravity, to models for latetime cosmological acceleration.
By focusing on the simplest examplemassive galileon effective field
theorieswe demonstrate that higher derivative terms can lead to the
existence of completely new oscillons (quasibreathers). We illustrate our
techniques in the artificially simple case of 1 + 1 dimensions, and then
present the complete analysis valid in 2 + 1 and 3 + 1 dimensions, exploring
precisely how these new solutions are supported entirely by the nonlinearities
of the quartic galileon. These objects have the novel peculiarity that they are
of the differentiability class $C^1$.

Glueballs and deconfinement temperature in AdS/QCD. (arXiv:1809.07730v1 [hepph])
Authors: S.S. Afonin, A.D. Katanaeva
We put forward an alternative way for estimations of the deconfinement
temperature in bottomup holographic models. The deconfinement in AdS/QCD is
related to the HawkingPage phase transition, in which the critical Hawking
temperature is identified with the deconfinement one in the gauge theory. The
numeric estimation of the latter is only possible when the parameters of a $5D$
dual model are previously determined from a consistency with other physical
aspects, standardly, providing description of the QCD resonances. The
traditional way of fixation of parameters in simplest AdS/QCD models is to
reproduce the mass of the $\rho$ meson or the slope of the approximate radial
Regge trajectory of the $\rho$ excitations. Motivated by a general idea that
the slope value originates in gluodynamics, we propose to calculate the
deconfinement temperature using the trajectory of scalar glueballs. We consider
several holographic models and use the recent idea of isospectral potentials to
make an additional check of the relevance of our approach. It is demonstrated
that different models from an isospectral family (i.e. the models leading to
identical predictions for spectrum of hadrons with fixed quantum numbers)
result in different predictions for the deconfinement temperature. This
difference is found to be quite small in the scalar glueball channel but very
large in the vector one. The observed stability in the former case clearly
favours the choice of the glueball channel for thermodynamic predictions in
AdS/QCD models. As a balanced approach we argue that either assuming
$f_0(1500)$ to have a dominating component of $0^{++}$ glueball or accepting
the idea of the universality in the radial Regge trajectories of light
nonstrange vector mesons, one can reproduce the results for the deconfinement
temperature obtained before in the lattice simulations in the background of
nondynamical quarks.

Recent Improvements for the Lepton Propagator PROPOSAL. (arXiv:1809.07740v1 [hepph])
Authors: Mario Dunsch, Jan Soedingrekso, Alexander Sandrock, Maximilian Meier, Thorben Menne, Wolfgang Rhode
The lepton propagator PROPOSAL is a MonteCarlo Simulation library written in
C++, propagating high energy muons and other charged particles through large
distances of media. In this article, a restructuring of the code is described,
which yields a performance improvement of up to $30\,\%$. For an improved
accuracy of the propagation processes, more exact calculations of the leptonic
and hadronic decay process and more precise parametrizations for the
interaction cross sections are now available. The new modular structure allows
a more flexible and custom usage, which is further facilitated with a python
interface.

Interactions of Charmed Mesons with Light Pseudoscalar Mesons from Lattice QCD and Implications on the Nature of the D_{s0}^*(2317). (arXiv:1208.4535v3 [heplat] UPDATED)
Authors: Liuming Liu, Kostas Orginos, FengKun Guo, Christoph Hanhart, UlfG. Meißner
We study the scattering of light pseudoscalar mesons ($\pi$, $K$) off charmed
mesons ($D$, $D_s$) in full lattice QCD. The Swave scattering lengths are
calculated using L\"uscher's finite volume technique. We use a relativistic
formulation for the charm quark. For the light quark, we use domainwall
fermions in the valence sector and improved KogutSusskind sea quarks. We
calculate the scattering lengths of isospin3/2 $D\pi$, $D_s\pi$, $D_sK$,
isospin0 $D\bar{K}$ and isospin1 $D\bar{K}$ channels on the lattice. For the
chiral extrapolation, we use a chiral unitary approach to nexttoleading
order, which at the same time allows us to give predictions for other channels.
It turns out that our results support the interpretation of the
$D_{s0}^*(2317)$ as a $DK$ molecule. At the same time, we also update a
prediction for the isospin breaking hadronic decay width
$\Gamma(D_{s0}^*(2317)\to D_s\pi)$ to $(133\pm22)$ keV.

What is a parton shower?. (arXiv:1705.08093v3 [hepph] UPDATED)
Authors: Zoltan Nagy, Davison E. Soper
We consider idealized parton shower event generators that treat parton spin
and color exactly, leaving aside the choice of practical approximations for
spin and color. We investigate how the structure of such a parton shower
generator is related to the structure of QCD. We argue that a parton shower
with splitting functions proportional to $\alpha_s$ can be viewed not just as a
model, but as the lowest order approximation to a shower that is defined at any
perturbative order. To support this argument, we present a formulation for a
parton shower at order $\alpha_s ^k$ for any $k$. Since some of the input
functions needed are specified by their properties but not calculated, this
formulation does not provide a useful recipe for an order $\alpha_s ^k$ parton
shower algorithm. However, in this formulation we see how the operators that
generate the shower are related to operators that specify the infrared
singularities of QCD.

Spatially Modulated Vacua in a Lorentzinvariant Scalar Field Theory. (arXiv:1706.02938v3 [hepth] UPDATED)
Authors: Muneto Nitta, Shin Sasaki, Ryo Yokokura
Spatial modulation has been studied for a long time in condensed matter,
nuclear matter and quark matter, so far in nonrelativistic field theories. In
this paper, spatially modulated vacua at zero temperature and zero density are
studied in relativistic field theories. We first propose an adaptation of the
NambuGoldstone theorem to higher derivative theories under the assumption of
the absence of ghosts: when a global symmetry is spontaneously broken due to
vacuum expectation values of spacetime derivatives of fields, a
NambuGoldstone (NG) boson appears without a canonical kinetic (quadratic
derivative) term with a quartic derivative term in the modulated direction
while a Higgs boson appears with a canonical kinetic term. We demonstrate this
in a simple model allowing (meta)stable modulated vacuum of a phase modulation
(FuldeFerrell state), where an NG mode associated with spontaneously broken
translational and $U(1)$ symmetries appears.

The economical 331 model revisited. (arXiv:1706.06152v3 [hepph] UPDATED)
Authors: P. V. Dong, D. Q. Phong, D. V. Soa, N. C. Thao
We show that the economical 331 model poses a very high new physics scale
of the order of 1000~TeV due to the constraint on the flavorchanging neutral
current. The implications of the model for neutrino masses, inflation,
leptogenesis, and superheavy dark matter are newly recognized. Alternatively,
we modify the model by rearranging the third quark generation differently from
the first two quark generations, as well as changing the scalar sector. The
resultant model now predicts a consistent new physics at TeV scale unlike the
previous case and may be fully probed at the current colliders. Particularly,
due to the minimal particle contents, the models under consideration manifestly
accommodate dark matter candidates and neutrino masses, with novel and distinct
production mechanisms. The large flavorchanging neutral currents that come
from the ordinary and exotic quark mixings can be avoided due to the
approximate $BL$ symmetry.

Jets and threshold summation in Deductor. (arXiv:1711.02369v2 [hepph] UPDATED)
Authors: Zoltan Nagy, Davison E. Soper
We explore jet physics in hadron collisions using the parton shower event
generator Deductor. Of particular interest is the one jet inclusive cross
section dsigma/dpT for jets of very high pT. Compared to the Born level, the
cross section decreases substantially because of pT loss from the jet during
showering. We compare to the same effect in Pythia and Dire. The cross section
then increases substantially because of the summation of threshold logarithms
included in Deductor.
We also study the cross section to have a gap with no jets between two hard
jets that are widely separated in rapidity. Here we compare Deductor with
virtuality based ordering with Deductor with kT ordering and we check whether
adding an underlying event and hadronization has a significant effect beyond
that found with just a parton shower.

Dark matter assisted Dirac leptogenesis and neutrino mass. (arXiv:1712.02960v2 [hepph] UPDATED)
Authors: Nimmala Narendra, Nirakar Sahoo, Narendra Sahu
We propose a minimal extension of the standard model with U(1)_{BL} \times
Z_{2} symmetry. In this model by assuming that the neutrinos are Dirac (i.e.
$BL$ is an exact symmetry), we found a simultaneous solution for non zero
neutrino masses and dark matter content of the universe. The observed baryon
asymmetry of the universe is also explained using Dirac Leptogenesis, which is
assisted by a dark sector, gauged under a U(1)_D symmetry. The latter symmetry
of the dark sector is broken at a TeV scale and thereby giving mass to a
neutral gauge boson Z_D. The standard model Zboson mixes with the gauge boson
Z_D at one loop level and thus paves a way to detect the dark matter through
spin independent elastic scattering at terrestrial laboratories.

A Simple Expression for Heavy to Light Meson Semileptonic Decays Form Factors. (arXiv:1801.09534v3 [hepph] UPDATED)
Authors: T. N. Pham
Like the twophoton and twogluon decays of the $P$wave $\chi_{c0,2}$ and
$\chi_{b0,2}$ charmonium state for which the Born term produces a very simple
decgays amplitude in terms of an effective Lagrangian with twoquark local
operator, the Born term for the processes $c\bar{d} \to (\pi,K) \ell \nu $ and
$b \bar{d}\to (\pi, K) \ell\nu $, could also produce the $D$ and $B$ meson
semileptonic decays with the light meson $\pi, K$ in the final state. In this
approach to heavylight meson form factors with the $\pi$, K meson treated as
Goldstone boson, a simple expression is found for the decays form factors,
given as~: $ f_{+}(0)/(1 q^{2}/(m_{H}^{2}+ m_{\pi}^{2}))$, with $H=D,B$ for
$D,B \to \pi$ form factors, and $f_{+}(0)/(1 q^{2}/(m_{H}^{2}+ m_{K}^{2}))$
for $B,D\to K$ form factor. The purpose of this paper is to show that this
expression for the form factors could describe rather well the $q^{2}$
behaviour observed in the BaBar, Belle and BESIII measurements and lattice
simulation. In particular, the $D\to K$ form factors are in good agreement with
the measured values in the whole range of $q^{2}$ showing evidence for $SU(3)$
breaking with the presence of $m_{K}^{2}$ term in the quark propagator, but
some corrections to the Born term are needed at large $q^{2}$ for $D,B \to \pi$
form factors.

Investigation of Dark Matter in the 3231 Model. (arXiv:1802.10402v2 [hepph] UPDATED)
Authors: D. T. Huong, P. V. Dong, N. T. Duy, N. T. Nhuan, L. D. Thien
We prove that the $SU(3)_C\otimes SU(2)_L \otimes SU(3)_R\otimes U(1)_X$
(3231) gauge model always contains a matter parity $W_P=(1)^{3(BL)+2s}$ as
conserved residual gauge symmetry, where $BL=2(\beta T_{8R}+X)$ is a
$SU(3)_R\otimes U(1)_X$ charge. Due to the nonAbelian nature of $BL$, the
$W$odd and $W$even fields are actually unified in gauge multiplets. We
investigate two viable versions for dark matter according to
$\beta=\pm1/\sqrt{3}$, where the dark matter candidates can be fermion, scalar,
or vector fields. We figure out the parameter spaces in the allowed regions of
the relic density and direct detection crosssections. Additionally, we examine
the neutrino masses induced by the seesaw mechanism along with associated
lepton flavor violation processes. The new gauge boson searches at the LEPII
and LHC are discussed.

The $H_0$ Tension in Nonflat QCDM Cosmology. (arXiv:1803.07320v2 [astroph.CO] UPDATED)
Authors: Haitao Miao, Zhiqi Huang
The recent local measurement of Hubble constant leads to a more than
$3\sigma$ tension with Planck + $\Lambda$CDM (Riess {\it et al} 2018). In this
article we study the $H_0$ tension in nonflat QCDM cosmology, where Q stands
for a minimally coupled and slowlyormoderately rolling quintessence field
$\phi$ with a smooth potential $V(\phi)$. By generalizing the QCDM
oneparameter and threeparameter parametrizations in Huang {\it et al} 2011 to
nonflat universe and using the latest cosmological data, we find that the
$H_0$ tension remains above $3.2\sigma$ level for this class of model.

A pseudoconformal equation of state in compactstar matter from topology change and hidden symmetries of QCD. (arXiv:1804.00305v5 [nuclth] UPDATED)
Authors: YongLiang Ma, Hyun Kyu Lee, WonGi Paeng, Mannque Rho
We construct a new effective field theory approach to the equation of state
(EoS), dubbed pseudoconfomal model "PCM," for nuclear and compact star matter
entirely in terms of effective hadron degrees of freedom. The possible
transition at $n\sim (24) n_0$ (where $n_0$ is the normal nuclear matter
density) from hadron degrees of freedom to stronglycoupled quark degrees of
freedom, giving rise to a softtohard changeover in the EoS that can
accommodate the massive stars observed, is effectuated by the topology change
at $n_{1/2}\gsim 2n_0$ from skyrmions to halfskyrmions without involving local
orderparameter fields. The mechanism exploits possible emergence of hidden
scale and local symmetries of QCD at high density, leading to a precocious
"pseudoconformal" sound velocity $v_s^2=1/3$ (in unit of $c=1$) for $n\gsim
3n_0$. The resulting prediction signals a drastic departure from standard
nuclear manybody theory in the density regime involved in the massive stars.
We suggest that the tidal deformability implemented in gravitational waves
coming from coalescing neutron stars in LIGO/Virgotype observations could pin
down the location of the topology change density $n_{1/2}$.

Heavy Quark Jet Fragmentation. (arXiv:1805.06014v2 [hepph] UPDATED)
Authors: Lin Dai, Chul Kim, Adam K. Leibovich
In this paper we study the fragmentation of a parton into a jet containing a
heavy quark. When heavy quarks are involved in a jet, the quark mass can lead
to a numerically significant correction to the jet cross section and its
substructure. With this motivation, we calculated the heavy quark mass effects
to nexttoleading order in $\alpha_s$ on the fragmentation functions to a jet
(FFJs) and the jet fragmentation functions (JFFs), where the former describes
fragmentation of parton into a jet and the latter describes fragmenting
processes inside a jet. The finite size of the heavy quark mass does not change
the ultraviolet behaviors, but it can give significant corrections to the
finite contributions. When we take the zero mass limit, we find that the FFJs
and the JFFs reproduce established results for massless partons. If we define
the heavy quark jet as one that include at least one heavy (anti)quark, the
tagged heavy quark jet production is sensitive to the heavy quark mass and
produces large logarithms of the mass. Taking advantage of the FFJs and JFFs,
we formulate a factorization theorem for heavy quark jet production in order to
resum these large logarithms systematically. As an application, we study
inclusive $b$jet production and show phenomenological implications due to
keeping a nonzero quark mass.

Logarithmic accuracy of parton showers: a fixedorder study. (arXiv:1805.09327v3 [hepph] UPDATED)
Authors: Mrinal Dasgupta, Frédéric A. Dreyer, Keith Hamilton, Pier Francesco Monni, Gavin P. Salam
We formulate some first fundamental elements of an approach for assessing the
logarithmic accuracy of partonshower algorithms based on two broad criteria:
their ability to reproduce the singularity structure of multiparton matrix
elements, and their ability to reproduce logarithmic resummation results. We
illustrate our approach by considering properties of two transverse momentum
ordered finalstate showers, examining features up to second order in the
strong coupling. In particular we identify regions where they fail to reproduce
the known singular limits of matrix elements. The characteristics of the shower
that are responsible for this also affect the logarithmic resummation
accuracies of the shower, both in terms of leading (double) logarithms at
subleading $N_C$ and nexttoleading (single) logarithms at leading $N_C$.

Actual Physics behind MonoX. (arXiv:1805.11637v3 [hepph] UPDATED)
Authors: Elias Bernreuther, Jan Horak, Tilman Plehn, Anja Butter
MonoX searches are standard dark matter search strategies at the LHC. First,
we show how in the case of initial state radiation they essentially collapse to
monojet searches. Second, we systematically study monoX signatures from
decays of heavier dark matter states. Direct detection constraints strongly
limit our MSSM expectations, but largely vanish for monoZ and monoHiggs
signals once we include light NMSSM mediators. Finally, the decay topology
motivates monoWpair and monoHiggspair searches, strengthening and
complementing their monoX counterparts.

Probing relic neutrino decays with 21 cm cosmology. (arXiv:1805.11717v2 [hepph] UPDATED)
Authors: Marco Chianese, Pasquale Di Bari, Kareem Farrag, Rome Samanta
We show how 21 cm cosmology can test relic neutrino radiative decays into
sterile neutrinos. Using recent EDGES results, we derive constraints on the
lifetime of the decaying neutrinos. If the EDGES anomaly will be confirmed,
then there are two solutions, one for much longer and one for much shorter
lifetimes than the age of the universe, showing how relic neutrino radiative
decays can explain the anomaly in a simple way. We also show how to combine
EDGES results with those from radio background observations, showing that
potentially the ARCADE 2 excess can be also reproduced together with the EDGES
anomaly within the proposed nonstandard cosmological scenario. Our calculation
of the specific intensity at the redshifts probed by EDGES can be also applied
to the case of decaying dark matter and it also corrects a flawed expression
appeared in previous literature.

Multipartite Dark Matter in $SU(2)_N$ extension of Standard Model and signatures at the LHC. (arXiv:1806.01129v2 [hepph] UPDATED)
Authors: Basabendu Barman, Subhaditya Bhattacharya, Mohammadreza Zakeri
An $SU(2)_N$ extension ($N$ stands for neutral) of the Standard Model (SM) is
proposed with an additional $U(1)=S^{'}$ global symmetry, which stabilizes the
lightest of the vector boson ($X,\bar{X}$) as dark matter (DM) through unbroken
$S=T_{3N}+S^{'}$. The field content of the model is motivated to address
neutrino mass generation, a possible unification to $SU(7)$, along with
spontaneous symmetry breaking of $SU(2)_N$ resulting in massive gauge bosons.
None of the SM particles are charged under $SU(2)_N$ and therefore $X,\bar{X}$
do not have a direct coupling to the visible sector besides a Higgs portal,
which is tiny to avoid any conflict with Higgs data. We show that, a large
kinematic region of this model allows the neutral component of $SU(2)_N$ scalar
triplet and heavy neutrinos introduced here to become additional DM components.
In this paper we explore the viability of such multipartite DM parameter space,
including nonzero DMDM interactions, to comply with relic density and direct
search constraints. We also demonstrate that the model may yield hadronically
quiet single lepton and two lepton signatures with missing energy at the Large
Hadron Collider (LHC) that can be accessed with high luminosity.

$K^0\Lambda$ photoproduction off the neutron with nucleon resonances. (arXiv:1806.01992v2 [hepph] UPDATED)
Authors: SangHo Kim, HyunChul Kim
We investigate kaon photoproduction off the neutron target, i.e., $\gamma n
\to K^0 \Lambda$, focusing on the role of nucleon resonances given in the
Review of Particle Data Group in the range of $\sqrt{s} \approx 1600  2200$
MeV. We employ an effective Lagrangian method and a Regge approach. The strong
couplings of nucleon resonances with $K\Lambda$ vertices are constrained by
quark model predictions. The numerical results of the total and differential
cross sections are found to be in qualitative agreement with the recent CLAS
and FOREST experimental data. We discuss the effects of the narrow nucleon
resonance $N(1685,1/2^+)$ on both the total and differential cross sections
near the threshold energy. In addition, we present the results of the beam
asymmetry as a prediction.

Longlived stau, sneutrino dark matter and rightslepton spectrum. (arXiv:1806.04488v2 [hepph] UPDATED)
Authors: Shankha Banerjee, Geneviève Bélanger, Avirup Ghosh, Biswarup Mukhopadhyaya
The minimal supersymmetric (SUSY) standard model (MSSM) augmented by right
chiral sneutrinos may lead to one such sneutrino serving as the lightest
supersymmetric particle and a nonthermal dark matter candidate, especially if
neutrinos have Dirac masses only. In such cases, if the lightest MSSM particle
is a stau, the signal of SUSY at the LHC consists in stable charged tracks
which are distinguishable from backgrounds through their time delay between the
inner tracker and the muon chamber. We show how to determine in such scenarios
the mass hierarchy between the lightest neutralino and right sleptons of the
first two families. The techniques of neutralino reconstruction, developed in
earlier works, are combined with the endpoint of the variable $M_{T2}$ in smuon
(selectron) decays for this purpose. We show that one can thus determine the
mass hierarchy for smuons (selectrons) and neutralinos up to 1 TeV, to the
level of 510\%.

The effect of the scalar unparticle on the production of Higgs  radion at high energy colliders. (arXiv:1807.00457v2 [hepph] UPDATED)
Authors: D. V. Soa, B. T. H. Giang
An attempt is made to present the influence of the scalar unparticle on some
scattering processes in the Randall  Sundum model. The contribution of the
scalar unparticle on the production of Higgs  radion at high energy colliders
is studied in detail. We evaluate the production crosssections in the
electronpositron ($e^{+}e^{}$), photonphoton ($\gamma\gamma$) and
gluongluon ($gg$) collisions, which depend strongly on the collision energy
$\sqrt{s}$, the scaling dimension $d_{U}$ of the unparticle operator
$\mathcal{O}_{U}$ and the energy scale $\Lambda_{U}$. Numerical evaluation
shows that the cross  sections for the pair production of scalar particles are
much larger than that of the associated production of the scalar particle with
unparticle in the same condition

Cutoff of IceCube Neutrino Spectrum due to tchannel Resonant Absorption by C$\nu$B. (arXiv:1808.01272v2 [hepph] UPDATED)
Authors: Subhendra Mohanty, Ashish Narang, Soumya Sadhukhan
The nonobservation of neutrinos by the IceCube at the Glashow resonance
energy of 6.3 PeV has been a long standing unresolved issue. In this paper we
propose a tchannel neutrino absorption by the C$\nu$B, which causes a cutoff
at 4.5 PeV neutrino energy, to explain the IceCube observations. We present a
neutrinophilic 2HDM where the neutrino masses are generated by a low scale
seesaw mechanism. A $\mathcal{O}$(10) MeV scalar mediates the interactions
between left and right handed neutrinos and generates the tchannel diagram
used for explaining the absence of Glashow resonance. The same scalar mediates
the annihilation of the dark matter and generates the correct relic density.

Let there be Light Dark Matter: The gauged $U(1)_{L_\muL_\tau}$ case. (arXiv:1808.03647v2 [hepph] UPDATED)
Authors: Patrick Foldenauer
As experimental null results increase the pressure on heavy weakly
interacting massive particles (WIMPs) as an explanation of thermal dark matter
(DM), it seems timely to explore previously overlooked regions of the WIMP
parameter space. In this work we extend the minimal gauged
$U(1)_{L_\muL_\tau}$ model studied in \cite{Bauer:2018onh} by a light
(MeVscale) vectorlike fermion $\chi$. Taking into account constraints from
cosmology, direct and indirect detection we find that the standard benchmark of
$M_V=3 m_\chi$ for DM coupled to a vector mediator is firmly ruled out for unit
DM charges. However, exploring the nearresonance region $M_V\gtrsim 2 m_\chi$
we find that this model can simultaneously explain the DM relic abundance
$\Omega h^2 =0.12$ and the $(g2)_\mu$ anomaly. Allowing for small charge
hierarchies of $\lesssim\mathcal{O}(10)$, we identify a second window of
parameter space in the fewGeV region, where $\chi$ can account for the full DM
relic density.

An extension of the SM based on effective PecceiQuinn Symmetry. (arXiv:1809.06563v2 [hepph] UPDATED)
Authors: Daijiro Suematsu
PecceiQuinn (PQ) mechanism based on a chiral global U(1) symmetry is
considered to be a simple and elegant solution for strong CP problem. Fact that
the mechanism could be experimentally examined through the axion search makes
it much more interesting and recently it causes a lot of attention again.
However, it is also known that the mechanism is annoyed by two serious
problems, that is, a domain wall problem and goodness of global symmetry. Any
global symmetry is considered not to be exact due to the quantum effect of
gravity. In this paper, we consider a solution to these problems, in which
quark mass hierarchy and mixing, neutrino mass generation and existence of dark
matter are closely related. In our solution, PQ symmetry is assumed to be
induced through symmetry breaking at an intermediate scale of a local U(1)
symmetry, and a global U(1) symmetry which plays a role of FroggattNielsen
symmetry . In the lepton sector, a remnant of the PQ symmetry controls neutrino
mass generation and dark matter existence.

Nonlinear mixing of Bogoliubov modes in a bosonic Josephson junction. (arXiv:1807.06682v1 [condmat.quantgas] CROSS LISTED)
Authors: Sofía MartínezGaraot, Giulio Pettini, Michele Modugno
We revisit the dynamics of a BoseEinstein condensate in a doublewell
potential, from the regime of Josephson plasma oscillations to the
selftrapping regime, by means of the Bogoliubov quasiparticle projection
method. For very small imbalance between left and right wells only the lowest
Bogoliubov mode is significantly occupied. In this regime the system performs
plasma oscillations at the corresponding frequency, and the evolution of the
condensate is characterized by a periodic transfer of population between the
ground and the first excited state. As the initial imbalance is increased, more
excited modes  though initially not macroscopically occupied  get coupled
during the evolution of the system. Since their population also varies with
time, the frequency spectrum of the imbalance turns out to be still peaked
around a single frequency, which is continuously shifted towards lower values.
The nonlinear mixing between Bogoliubov modes eventually drives the system into
the the selftrapping regime, when the population of the ground state can be
transferred completely to the excited states at some time during the evolution.
For simplicity, here we consider a onedimensional setup, but the results are
expected to hold also in higher dimensions.

Squeezed vacuum used to accelerate the search for a weak classical signal. (arXiv:1809.06470v1 [quantph] CROSS LISTED)
Authors: M. Malnou, D. A. Palken, B. M. Brubaker, Leila R. Vale, Gene C. Hilton, K. W. Lehnert
Many experiments that interrogate fundamental theories now use detectors
whose sensitivities are limited by the laws of quantum mechanics. For example,
in cavitybased searches for axionic dark matter, vacuum fluctuations in the
two quadratures of the cavity electromagnetic field limit the sensitivity to an
axioninduced field. We demonstrate both theoretically and experimentally that
such quantum limits can be overcome through the use of squeezed states in a
search for a weak, classical signal of unknown frequency. By preparing a
microwave cavity in a squeezed state and measuring just the squeezed
quadrature, we find a squeezinginduced enhancement of the spectral scan rate
by a factor of $2.12 \pm 0.08$. This enhancement is in quantitative agreement
with our calculation which accounts for both imperfect squeezing and
measurement.
