
Cosmological constraints with selfinteracting sterile neutrinos. (arXiv:1805.08218v1 [astroph.CO])
Authors: Ningqiang Song, M.C. GonzalezGarcia, Jordi Salvado
In this work we revisit the question of whether Cosmology can be made
compatible with scenarios with light sterile neutrinos, as invoked to explain
the SBL anomalies, in the presence of selfinteraction among sterile neutrinos
mediated by massive gauge bosons. We examine this proposal by deriving the
cosmological predictions of the model in a wide range of the model parameters
including the effective interaction strength $G_X$, sterile neutrino mass
$m_{\rm st}$ and activesterile mixings. With those we perform a statistical
analysis of the cosmological data from BBN, CMB, and BAO data to infer the
posterior probabilities of the sterile selfinteraction model parameters. BBN
mostly provides information about the effective interaction strength and we
find that $\log_{10}(G_X/G_F)\geq 3.6$ can describe the primordial abundances
at 95% CL. Our analysis of CMB and BAO data show that when allowing a wide
prior for the sterile neutrino mass its posterior is bounded to $m_{\rm st}\leq
0.91~{\rm eV}$ (95% CL) considering CMB data only and $m_{\rm st}\leq 0.37~{\rm
eV}$ (95% CL) when adding the BAO information. So the mass bounds are slighly
relaxed compared with that of a noninteracting sterile neutrino model but a
sterile neutrino mass of 1 eV is still excluded at more than $2\sigma$ CL.
Conversely if fixing the sterile neutrino mass and mixing to the values
prefered by short baseline data we find that while that CMB data alone favors
the selfinteracting scenario, including the BAO information severly degrades
the agreement with the model. Altogether we conclude then that adding the
selfinteraction can alleviate the tension between eV sterile neutrinos and CMB
data, but when including also the BAO results the selfinteracting sterile
neutrino model cannot lead to a satisfactory description of the data.

$b \to c \tau \nu_{\tau}$ Decays: A Catalogue to Compare, Constrain, and Correlate New Physics Effects. (arXiv:1805.08222v1 [hepph])
Authors: Srimoy Bhattacharya, Soumitra Nandi, Sunando Kumar Patra
In this article, we have predicted the standard model (SM) values of the
asymmetric and angular observables in $B\to D^{(\ast)}\tau\nu_{\tau}$ decays,
using the results of the new uptodate analysis in $B\to
D^{(*)}\ell\nu_{\ell}$. We have also revisited the SM prediction of the
inclusive ratio $\mathcal{R}_{X_c}$, and our predicted value is
$\mathcal{R}_{X_c} = 0.214 \pm 0.004$. In addition, we have analysed the $b\to
c\tau\nu_{\tau}$ decay modes in a modelindependent framework of effective
field theory beyond the standard model. Considering all possible combinations
of the effective operators in $b \to c \tau\nu_{\tau}$ decays and using the
Akaike Information Criterion, we find out the scenarios which can best explain
the available data on these channels. In the selected scenarios, bestfit
values and correlations of the new parameters are extracted. Using these
results, predictions are made on various observables in the exclusive and
inclusive semitaunic $b \to c $ decays. The graphical correlations between
these observables are shown, which are found to be useful in discriminating
between various new physics scenarios.

Supercurrent anomaly and gauge invariance in N=1 supersymmetric YangMills theory. (arXiv:1805.08225v1 [hepth])
Authors: Y. R. Batista, Brigitte Hiller, Adriano Cherchiglia, Marcos Sampaio
We analyse Feynman diagram calculational issues related to the quantum
breaking of supercurrent conservation in a supersymmetric nonabelian
YangMills theory. For the sake of simplicity, we take a zero mass gauge field
multiplet interacting with a massless Majorana spin$1/2$ field in the adjoint
representation of $SU(2)$. We shed light on a longstanding controversy
regarding the perturbative evaluation of the supercurrent anomaly in connection
with gauge and superconformal symmetry in different frameworks. We find that
only superconformal symmetry is unambiguously broken using an invariant four
dimensional regularization and compare with the triangle AVV anomaly.
Subtleties related to momentum routing invariance in the loops of diagrams and
Clifford algebra evaluation inside divergent integrals are also discussed in
connection with finite and undetermined quantities in Feynman amplitudes.

The stochastic gravitationalwave background in the absence of horizons. (arXiv:1805.08229v1 [grqc])
Authors: Enrico Barausse, Richard Brito, Vitor Cardoso, Irina Dvorkin, Paolo Pani
Gravitationalwave astronomy has the potential to explore one of the deepest
and most puzzling aspects of Einstein's theory: the existence of black holes. A
plethora of ultracompact, horizonless objects have been proposed to arise in
models inspired by quantum gravity. These objects may solve Hawking's
informationloss paradox and the singularity problem associated with black
holes, while mimicking almost all of their classical properties. They are,
however, generically unstable on relatively short timescales. Here, we show
that this "ergoregion instability" leads to a strong stochastic background of
gravitational waves, at a level detectable by current and future
gravitationalwave detectors. The absence of such background in the first
observation run of Advanced LIGO already imposes the most stringent limits to
date on blackhole alternatives, showing that certain models of
"quantumdressed" stellar black holes can be at most a small percentage of the
total population. The future LISA mission will allow for similar constraints on
supermassive blackhole mimickers.

Collider Bounds on 2Higgs Doublet Models with $U(1)_X$ Gauge Symmetries. (arXiv:1805.08231v1 [hepph])
Authors: Daniel A. Camargo, Luigi Delle Rose, Stefano Moretti, Farinaldo S. Queiroz
2Higgs Doublet Models (2HDMs) typically need to invoke an adhoc discrete
symmetry to avoid severe flavor bounds and in addition feature massless
neutrinos, thus falling short of naturally complying with existing data.
However, when augmented by an Abelian gauge symmetry naturally incorporating
neutrino masses via a typeI seesaw mechanism while at the same time escaping
flavor changing interactions, such enlarged 2HDMs become very attractive
phenomenologically. In such frameworks, the distinctive element is the $Z'$
gauge boson generated by the spontaneous breaking of the Abelian group
$U(1)_X$. In this work, we derive updated collider bounds on it. Several
theoretical setups are possible, each with different and sometimes suppressed
couplings to quarks and leptons. Thus, complementary data from dijet and
dilepton resonance searches need to be considered to fully probe these objects.
We employ the corresponding datasets as obtained at the Large Hadron Collider
(LHC) at the 13 TeV CMs energy for $\mathcal{L}=12,36$ and $300$ fb$^{1}$ of
luminosity. Moreover, we present the potential sensitivity to such $Z'$s of the
High Luminosity LHC (HLLHC) and High Energy LHC (HELHC).

Baryons under Strong Magnetic Fields or in Theories with Spacedependent $\theta$term. (arXiv:1805.08245v1 [hepth])
Authors: Dimitrios Giataganas
Baryonic states are sufficiently complex to reveal physics that is hidden in
the mesonic bound states. We study analytically and numerically baryons in
theories with spacedependent $\theta$term, or theories under strong magnetic
fields. Such studies on baryons are accommodated in a generic analytic
framework we develop for anisotropic theories, where their qualitative features
are common irrespective of the source that triggers the anisotropy. We find
that the distribution of the quarks forming the state, depends on the angle
between the baryon and the anisotropic direction. Its shape is increasingly
elliptic with respect to the strength of the field sourcing the anisotropy,
counterbalancing the broken rotational invariance on the gluonic degrees of
freedom. Strikingly, the baryons dissociate in stages with a process that
depends on the proximity of the quarks to the anisotropic direction, where
certain quark pairs abandon the bound state first, followed by the closest
pairs to them as the temperature increases. This observation may also serve as
a way to identify the nature of certain exotic states. Finally, we investigate
holographic baryons with decreased number of quarks and explain why in theories
under consideration the presence of anisotropy does not modify the universal
stability condition in contrast to the usual trend.

Asymmetric Dark Matter, Inflation and Leptogenesis from BL Symmetry Breaking. (arXiv:1805.08251v1 [hepph])
Authors: P. V. Dong, D. T. Huong, Daniel A. Camargo, Farinaldo S. Queiroz, José W. F. Valle
We propose a unified setup for dark matter, inflation and baryon asymmetry
generation through the neutrino mass seesaw mechanism. Our scenario emerges
naturally from an extended gauge group containing $BL$ as a noncommutative
symmetry, broken by a singlet scalar that also drives inflation. Its decays
reheat the universe, producing the lightest righthanded neutrino. Automatic
matter parity conservation leads to the stability of an asymmetric dark matter
candidate, directly linked to the matterantimatter asymmetry in the universe.

E6 inspired SUSY models with Custodial Symmetry. (arXiv:1805.08260v1 [hepph])
Authors: R. Nevzorov
The breakdown of E_6 within the supersymmetric (SUSY) Grand Unified Theories
(GUTs) can result in SUSY extensions of the standard model (SM) based on the SM
gauge group together with extra U(1) gauge symmetry under which righthanded
neutrinos have zero charge. In these U(1)_N extensions of the minimal
supersymmetric standard model (MSSM) a single discrete \tilde{Z}^H_2 symmetry
may be used to suppress the most dangerous operators, that give rise to proton
decay as well as nondiagonal flavour transitions at low energies. The SUSY
models under consideration involves Z' and extra exotic matter beyond the MSSM.
We discuss leptogenesis within this SUSY model and argue that the extra exotic
states may lead to the nonstandard Higgs decays.

$K^*$ mesons with hidden charm arising from $KX(3872)$ and $KZ_c(3900)$ dynamics. (arXiv:1805.08330v1 [hepph])
Authors: XiuLei Ren, Brenda B. Malabarba, LiSheng Geng, K. P. Khemchandani, A. Martinez Torres
Inspired by the recent discovery of the pentaquark states $P_c(4450)$ and
$P_c(4380)$, which can be viewed as excited nucleon states with hidden charm,
we study the threebody interaction of a kaon and a pair of
$D\bar{D}^*+\text{c.c.}$ We show that the two body interactions stringently
constrained by the existence of the $D_{s0}^*(2317)$, $D^*_{s1}(2460)$,
$X(3872)$, and $Z_c(3900)$, which are widely believed to contain large $DK$,
$D^* K$, and $D\bar{D}^*+\text{c.c.}$ components, inevitably lead to the
existence of two heavy $K^*$ mesons with hidden charm. Concrete coupled channel
threebody calculations yield their masses and widths as $4337.0  i 3.3$ MeV
and $4277.6  i 14.0$ MeV with $I(J^P)=1/2(1^)$. These states, if found
experimentally, definitely cannot be accommodated in a $q\bar{q}$ picture, and
therefore presents a clear case of exotic hadrons.

The Effective JFactor of the Galactic Center for VelocityDependent Dark Matter Annihilation. (arXiv:1805.08379v1 [astroph.HE])
Authors: Kimberly K. Boddy, Jason Kumar, Louis E. Strigari
We present the effective $J$factors for the Milky Way for scenarios in which
dark matter annihilation is pwave or dwave suppressed. We find that the
velocity suppression of dark matter annihilation can have a sizable effect on
the morphology of a potential dark matter annihilation signal in the Galactic
Center. The gammaray flux from the innermost region of the Galactic Center is
in particular suppressed. We find that for dark matter density profiles with
steep inner slopes, the morphology of the Inner Galaxy gammaray emission in
pwave models can be made similar to the morphology in standard swave models.
This similarity may suggest that model discrimination between swave and pwave
is challenging, for example, when fitting the Galactic Center excess. However,
we show that it is difficult to simultaneously match s and pwave morphologies
at both large and small angular scales. The $J$factors we calculate may be
implemented with astrophysical foreground models to selfconsistently determine
the morphology of the excess with velocitysuppressed dark matter annihilation.

$D \Xi$ and $D^* \Xi$ Molecular States from One Boson Exchange. (arXiv:1805.08384v1 [hepph])
Authors: MingZhu Liu, TianWei Wu, JuJun Xie, Manuel Pavon Valderrama, LiSheng Geng
We explore the existence of $D \Xi$ and $D^* \Xi$ molecular states within the
one boson exchange model. We regularize the potential derived in this model
with a form factor and a cutoff of the order of $1\,{\rm GeV}$. To determine
the cutoff, we use the condition that the $X(3872)$ is reproduced as a pole in
the $J^{PC} = 1^{++}$ $D^*\bar{D}$ amplitude. From this we find that the $J^P=
{\frac{1}{2}}^{}$ $D^*\,\Xi$ system is on the verge of binding and has an
unnaturally large scattering length. For the $J^P= {\frac{1}{2}}^{}$ $D\,\Xi$
and the $J^P= {\frac{3}{2}}^{}$ $D^*\,\Xi$ systems the attraction is not
enough to form a bound state. From heavy quark symmetry and the quark model we
can extend the previous model to the $P \Xi_{QQ}$ and $P^* \Xi_{QQ}$ systems,
with $P = D, \bar{B}$, $P^* = D^*, \bar{B}^*$ and $\Xi_{QQ} = \Xi_{cc},
\Xi_{bb}$. In this case we predict a series of triply heavy pentaquarklike
molecules.

Testing the universality of free fall towards dark matter with radio pulsars. (arXiv:1805.08408v1 [grqc])
Authors: Lijing Shao, Norbert Wex, Michael Kramer
The violation of the weak equivalence principle (EP) in the gravitational
field of the Earth, described by the E\"otv\"os parameter $\eta_\oplus$, was
recently constrained to the level $\left\eta_\oplus\right \lesssim 10^{14}$
by the MICROSCOPE space mission. The E\"otv\"os parameter $\eta_{\rm DM}$,
pertaining to the differential couplings of dark matter (DM) and ordinary
matter, was only tested to the level $\left \eta_{\rm DM} \right \lesssim
10^{5}$ by the E\"otWash group and lunar laser ranging. This test is limited
by the EPviolating driving force in the Solar neighborhood that is determined
by the Galactic distribution of DM. Here we propose a novel celestial
experiment using the orbital dynamics from radio timing of binary pulsars, and
obtain a competing limit on $\eta_{\rm DM}$ from a neutron star (NS)  white
dwarf (WD) system, PSR J1713+0747. The result benefits from the large material
difference between the NS and the WD, and the large gravitational binding
energy of the NS. If we can discover a binary pulsar within $\sim 10$ parsecs
of the Galactic center, where the driving force is much larger in the expected
DM spike, precision timing will improve the test of the universality of free
fall towards DM and constrain various proposed couplings of DM to the Standard
Model by several orders of magnitude. Such a test probes the hypothesis that
gravity is the only longrange interaction between DM and ordinary matter.

A light singlet at the LHC and DM. (arXiv:1805.08436v1 [hepph])
Authors: Jan Kalinowski
An interesting scenario of an Rsymmetric supersymmetric model with a light
singlet is discussed. Since a light scalar in this model necessarily implies a
light Dirac neutralino, its viability as a dark matter candidate is addressed.

Inflation in gauge theory of gravity with local scaling symmetry and quantum induced symmetry breaking. (arXiv:1805.08507v1 [grqc])
Authors: Yong Tang, YueLiang Wu
Motivated by the gauge theory of gravity with local scaling symmetry proposed
recently in 1712.04537 and 1506.01807, we investigate whether the scalar field
therein can be responsible for the inflation. We show that the classical theory
would suffer from the difficulty that inflation can start but will never stop.
We explore possible solutions by invoking the symmetry breaking through quantum
effects. The effective potential of the scalar field is shown to have
phenomenologically interesting forms to give viable inflation models. The
predictions of physical observables agree well with current cosmological
measurements and can be further tested in future experiments searching for
primordial gravitational waves.

Null tests from angular distributions in $D \to P_1 P_2 l^+l^$, $l=e,\mu$ decays on and off peak. (arXiv:1805.08516v1 [hepph])
Authors: Stefan de Boer, Gudrun Hiller
We systematically analyze the full angular distribution in $D \to P_1 P_2 l^+
l^$ decays, where $P_{1,2}=\pi,K$, $l=e,\mu$. We identify several null tests
of the standard model (SM). Notably, the angular coefficients $I_{5,6,7}$,
driven by the leptons' axialvector coupling $C_{10}^{(\prime)}$, vanish by
means of a superior GIMcancellation and are protected by parity invariance
below the weak scale. CPodd observables related to the angular coefficients
$I_{5,6,8,9}$ allow to measure CPasymmetries without $D$tagging. The
corresponding observables $A_{5,6,8,9}$ constitute null tests of the SM. Lepton
universality in $\Delta c =\Delta u=1$ transitions can be tested by
comparing $D \to P_1 P_2 \mu^+ \mu^$ to $D \to P_1 P_2 e^+ e^$ decays. Data
for $P_1 P_2=\pi^+ \pi^$ and $K^+ K^$ on muon modes are available from LHCb
and on electron modes from BESIII. Corresponding ratios of dimuon to dielectron
branching fractions are at least about an order of magnitude away from probing
the SM. In the future electron and muon measurements should be made available
for the same cuts as corresponding ratios $R_{P_1 P_2}^D$ provide null tests of
$e$$\mu$universality. We work out beyondSM signals modelindependently and
in SM extensions with leptoquarks.

Dark Matter in Quantum Gravity. (arXiv:1805.08552v1 [hepth])
Authors: Xavier Calmet, Boris Latosh
We show that quantum gravity, whatever its ultraviolet completion might be,
could account for dark matter. Indeed, besides the massless gravitational field
recently observed in the form of gravitational waves, the spectrum of quantum
gravity contains two massive fields respectively of spin 2 and spin 0. If these
fields are longlived, they could easily account for dark matter. In that case,
dark matter would be very light and only gravitationally coupled to the
standard model particles.

MoMEMta, a modular toolkit for the Matrix Element Method at the LHC. (arXiv:1805.08555v1 [hepph])
Authors: Sébastien Brochet (1), Christophe Delaere (1), Brieuc François (1), Vincent Lemaître (1), Alexandre Mertens (1), Alessia Saggio (1), Miguel Vidal Marono (1), Sébastien Wertz (1) ((1) Centre for Cosmology, Particle Physics and Phenomenology (CP3), Université catholique de Louvain)
The Matrix Element Method has proven to be a powerful method to optimally
exploit the information available in detector data. Its widespread use is
nevertheless impeded by its complexity and the associated computing time.
MoMEMta, a C++ software package to compute the integrals at the core of the
method, provides a versatile implementation of the Matrix Element Method to
both the theory and experiment communities. Its modular structure covers the
needs of experimental analysis workflows at the LHC without compromising ease
of use on simpler and smaller simulated samples used for phenomenological
studies. In this paper, we present version 1.0 of MoMEMta, together with
examples illustrating the wide range of application at the LHC accessible for
the first time with a single tool.

Phenomenology of GeVscale Heavy Neutral Leptons. (arXiv:1805.08567v1 [hepph])
Authors: Kyrylo Bondarenko, Alexey Boyarsky, Dmitry Gorbunov, Oleg Ruchayskiy
We review and revise phenomenology of the GeVscale heavy neutral leptons
(HNLs). We extend the previous analyses by including more channels of HNLs
production and decay and provide with more refined treatment, including QCD
corrections for the HNLs of masses $\mathcal{O}(1)$ GeV. We summarize the
relevance of individual production and decay channels for different masses,
resolving a few discrepancies in the literature. Our final results are directly
suitable for sensitivity studies of particle physics experiments (ranging from
proton beamdump to the LHC) aiming at searches for heavy neutral leptons.

ExDiff Monte Carlo generator for Exclusive Diffraction. Version 2.0. Physics and manual. (arXiv:1805.08591v1 [hepph])
Authors: R.A. Ryutin
ExDiff2.0 is a Monte Carlo event generator for simulation of Exclusive
Diffractive processes in protonproton collisions. The present version includes
reactions: elastic scattering $pp\to pp$ at 7, 8, 13, 14~TeV; $pp\to p+R+p$, $R
= f_0(1500)$, $f_0(1710)$, $f_2(1950)$ at 8 and 13~TeV, $f_2(1270)$ at 8~TeV,
$f_2(2220)$ at 13~TeV. In the future versions many processes of Central
Exclusive Diffractive Production will be added. This version is linked to
PYTHIA 8 (to make resonance decays and hadronization) and also to ROOT and
HEPMC output via PYTHIA 8 interface. Also some test files of Born distributions
for CEDP of two pions are added.

Flavour Dynamics and Violations of the CP Symmetry. (arXiv:1805.08597v1 [hepph])
Authors: Antonio Pich
An overview of flavour physics and CPviolating phenomena is presented. The
Standard Model quarkmixing mechanism is discussed in detail and its many
successful experimental tests are summarized. Flavourchanging transitions put
very stringent constraints on newphysics scenarios beyond the Standard Model
framework. Special attention is given to the empirical evidences of CP
violation and their important role in our understanding of flavour dynamics.
The current status of the socalled flavour anomalies is also reviewed.

Pion condensation and phase diagram in the Polyakovloop quarkmeson model. (arXiv:1805.08599v1 [hepph])
Authors: Prabal Adhikari, Jens O. Andersen, Patrick Kneschke
We use the Polyakovloop extended twoflavor quarkmeson model as a
lowenergy effective model for QCD to study the phase diagram in the
$\mu_I$$T$ plane where $\mu_I$ is the isospin chemical potential. In
particular, we focus on the Bose condensation of charged pions. At $T=0$, the
onset of pion condensation is at $\mu_I={1\over2}m_{\pi}$ in accordance with
exact results. The phase transition to a Bosecondensed phase is of second
order for all values of $\mu_I$ and we find that there is no pion condensation
for temperatures larger than approximately 187 MeV. The chiral transition
temperature coincides with the critical temperature for Bose condensation for
values of the isospin chemical potential larger than $\mu_I\approx110$ MeV. We
compare our results with recent lattice simulations and find overall good
agreement.

Model Selection with Stronglensing Systems. (arXiv:1805.08640v1 [astroph.CO])
Authors: Kyle Leaf, Fulvio Melia
In this paper, we use an unprecedentedly large sample (158) of confirmed
strong lens systems for model selection, comparing five well studied
FriedmannRobertsonWalker cosmologies: LCDM, wCDM (the standard model with a
variable darkenergy equation of state), the R_h=ct universe, the (empty) Milne
cosmology, and the classical Einsteinde Sitter (matter dominated) universe. We
first use these sources to optimize the parameters in the standard model and
show that they are consistent with Planck, though the quality of the best fit
is not satisfactory. We demonstrate that this is likely due to underreported
errors, or to errors yet to be included in this kind of analysis. We suggest
that the missing dispersion may be due to scatter about a pure single
isothermal sphere (SIS) model that is often assumed for the mass distribution
in these lenses. We then use the Bayes information criterion, with the
inclusion of a suggested SIS dispersion, to calculate the relative likelihoods
and ranking of these models, showing that Milne and Einsteinde Sitter are
completely ruled out, while R_h=ct is preferred over LCDM/wCDM with a relative
probability of ~73% versus ~24%. The recently reported sample of new strong
lens candidates by the Dark Energy Survey, if confirmed, may be able to
demonstrate which of these two models is favoured over the other at a level
exceeding 3 sigma.

Flavorful Two Higgs Doublet Models with a Twist. (arXiv:1805.08659v1 [hepph])
Authors: Wolfgang Altmannshofer, Brian Maddock
We explore Two Higgs Doublet Models with nonstandard flavor structures. In
analogy to the four, well studied, models with natural flavor conservation
(type 1, type 2, leptonspecific, flipped), we identify four models that
preserve an approximate $U(2)^5$ flavor symmetry acting on the first two
generations. In all four models, the couplings of the 125 GeV Higgs are
modified in characteristic flavor nonuniversal ways. The heavy neutral and
charged Higgs bosons show an interesting nonstandard phenomenology. We discuss
their production and decay modes and identify the most sensitive search
channels at the LHC. We study the effects on low energy flavor violating
processes finding relevant constraints from $B_d$ and $B_s$ meson oscillations
and from the rare decay $B_s \to \mu^+ \mu^$. We also find that lepton flavor
violating $B$ meson decays like $B_s \to \tau \mu$ and $B \to K^{(*)} \tau \mu$
might have branching ratios at an observable level.

Axial anomaly and hadronic properties in nuclear medium. (arXiv:1805.08713v1 [nuclth])
Authors: G. Fejos, A. Hosaka
We investigate meson and nucleon dynamics at finite baryon density and
temperature by coupling the nucleon field and the omega meson to the
threeflavor linear sigma model and calculate hadronic properties around the
nuclear liquidgas transition. We apply the Functional Renormalization Group
method, and find that mesonic fluctuations increase the strength of the
coefficient of the $U_A(1)$ breaking determinant operator as a function of the
chiral condensate. As a consequence, we find that the actual value of the
anomaly increases discontinuously at the first order nuclear liquidgas
transition. We calculate how mesonic masses and partial restoration of chiral
symmetry are modified due to such an effect.

The QCD Axion Window and Low Scale Inflation. (arXiv:1805.08763v1 [hepph])
Authors: Alan H. Guth, Fuminobu Takahashi, Wen Yin
We show that the upper bound of the classical QCD axion window can be
significantly relaxed for lowscale inflation. If the GibbonsHawking
temperature during inflation is lower than the QCD scale, the initial QCD axion
misalignment angle follows the BunchDavies distribution. As a result, the
axion overproduce problem is significantly relaxed even for the axion decay
constant larger than $10^{12}$ GeV. We give concrete hilltop inflation models
where the Hubble parameter during inflation is comparable to or much smaller
than the QCD scale and the successful reheating takes place via perturbative
decays or dissipation processes.

Exploring compensated isocurvature perturbations with CMB spectral distortion anisotropies. (arXiv:1805.08773v1 [astroph.CO])
Authors: Taku Haga, Keisuke Inomata, Atsuhisa Ota, Andrea Ravenni
We develop a linear perturbation theory for the spectral $y$distortions of
the cosmic microwave background~(CMB). The $y$distortions generated during the
recombination epoch are usually negligible because the energy transfer due to
the Compton scattering is strongly suppressed at that time, while they can be
significant if there is a considerable compensated isocurvature
perturbation~(CIP), which is not well constrained from the present CMB
observations. The linear $y$distortions explicitly depend on the baryon
density fluctuations, therefore $y$ anisotropies can completely resolve the
degeneracy between the baryon isocurvature perturbations and the cold dark
matter ones. This novel method is free from lensing contaminations that can
affect the previous approach to the CIPs based on the nonlinear modulation of
the CMB anisotropies. We compute the cross correlation functions of the
$y$distortions with the CMB temperature and the $E$ mode polarization
anisotropies. They are sensitive to the correlated CIPs parameterized by
$f'\equiv\mathcal P_{\rm CIP\zeta}/\mathcal P_{\zeta \zeta}$ with $\mathcal
P_{\zeta \zeta}$ and $\mathcal P_{\rm CIP\zeta}$ being the auto correlation of
the adiabatic perturbations and the cross correlation between them and the
CIPs. We investigate how well the $y$ anisotropies will constrain $f'$ in
future observations such as those provided by a PIXIElike and a PRISMlike
survey, LiteBIRD and the cosmic variance limited~(CVL) survey, taking into
account the degradation in constraining power due to the presence of Sunyaev
Zel'dovich effect from galaxy clusters. For example, our optimistic forecast
shows that $f'<3\times 10^{3}$ at 68\% C.L. is possible for LiteBIRD, while
$f'<5.0\times 10^{2}$ for the CVL observations.

Precise prediction for the light MSSM Higgs boson mass combining effective field theory and fixedorder calculations. (arXiv:1608.01880v3 [hepph] UPDATED)
Authors: Henning Bahl, Wolfgang Hollik
In the Minimal Supersymmetric Standard Model heavy superparticles introduce
large logarithms in the calculation of the lightest $\mathcal{CP}$even Higgs
boson mass. These logarithmic contributions can be resummed using effective
field theory techniques. For light superparticles, however, fixedorder
calculations are expected to be more accurate. To gain a precise prediction
also for intermediate mass scales, both approaches have to be combined. Here,
we report on an improvement of this method in various steps: the inclusion of
electroweak contributions, of separate electroweakino and gluino thresholds, as
well as resummation at the NNLL level. These improvements can lead to
significant numerical effects. In most cases, the lightest $\mathcal{CP}$even
Higgs boson mass is shifted downwards by about 1 GeV. This is mainly caused by
higher order corrections to the $\bar{\text{MS}}$ topquark mass. We also
describe the implementation of the new contributions in the code {\tt
FeynHiggs}.

Chiral symmetry restoration at finite temperature within the Hamiltonian approach to QCD in Coulomb gauge. (arXiv:1706.06966v2 [hepph] UPDATED)
Authors: Ehsan Ebadati, Hugo Reinhardt, Peter Vastag
The chiral phase transition of the quark sector of QCD is investigated within
the Hamiltonian approach in Coulomb gauge. Finite temperatures $T$ are
introduced by compactifying one spatial dimension, which makes all
thermodynamical quantities accessible from the ground state on the spatial
manifold $\mathbb{R}^2 \times S^1(1/T)$. In the limit of a vanishing
quarkgluon coupling, the equations of motion of the quark sector are solved
numerically and the chiral quark condensate is evaluated and compared to the
results of the usual canonical approach to finitetemperature Hamiltonian QCD
based on the density operator of the grand canonical ensemble. For zero bare
quark masses, we find a secondorder chiral phase transition with a critical
temperature of about $107 \, \mathrm{MeV}$.

Transverse Momentum Distribution and Elliptic Flow of Charged Hadrons in $U$+$U$ collisions at $\sqrt{s_{NN}}=193$ GeV using HYDJET++. (arXiv:1707.07552v3 [nuclth] UPDATED)
Authors: Arpit Singh, P. K. Srivastava, O. S. K. Chaturvedi, S. Ahmad, B. K. Singh
Recent experimental observations of the charged hadron properties in $U+U$
collisions at $193$ GeV contradict many of the theoretical models of particle
production including twocomponent Monte Carlo Glauber model. The experimental
results show a small correlation between the charged hadron properties and the
initial geometrical configurations (e.g. bodybody, tiptip etc.) of $U+U$
collisions. In this article, we have modified the Monte Carlo HYDJET++ model to
study the charged hadron production in $U+U$ collisions at $193$ GeV
centerofmass energy in tiptip and bodybody initial configurations. We have
modified the hard as well as soft production processes to make this model
suitable for $U+U$ collisions. We have calculated the pseudorapidity
distribution, transverse momentum distribution and elliptic flow distribution
of charged hadrons with different control parameters in various geometrical
configurations possible for $U+U$ collision. We find that HYDJET++ model
supports a small correlation between the various properties of charged hadrons
and the initial geometrical configurations of $U+U$ collision. Further, the
results obtained in modified HYDJET++ model regarding $dn_{ch}/d\eta$ and
elliptic flow ($v_{2}$) suitably matches with the experimental data of $U+U$
collisions in minimum bias configuration.

Direct photon spectrum and elliptic flow produced from Pb+Pb collisions at $\sqrt{s_{NN}}=2.76$ TeV at the CERN Large Hadron Collider within an integrated hydrokinetic model. (arXiv:1710.07689v2 [hepph] UPDATED)
Authors: V.Yu. Naboka, Yu.M. Sinyukov, G.M. Zinovjev
The photon transverse momentum spectrum and its anisotropy from Pb+Pb
collisions at the CERN Large Hadron Collider energy $\sqrt {s_{NN}}=2.76$ TeV
are investigated within the integrated hydrokinetic model (iHKM). Photon
production is accumulated from the different processes at the various stages of
relativistic heavy ion collisions: from the primary hard photons of very early
stage of parton collisions to the thermal photons from equilibrated quarkgluon
and hadron gas stages. Along the way a hadronic medium evolution is treated in
two distinct, in a sense opposite, approaches: chemically equilibrated and
chemically frozen system expansion. Studying the centrality dependence of the
results obtained allows us to conclude that a relatively strong transverse
momentum anisotropy of thermal radiation is suppressed by prompt photon
emission which is an isotropic. We find out that this effect is getting
stronger as centrality increases because of the simultaneous increase in the
relative contribution of prompt photons in the soft part of the spectra. The
substantial results obtained in iHKM with nonzero viscosity ($\eta/s=0.08$) for
photon spectra and $v_2$ coefficients are mostly within the error bars of
experimental data, but there is some systematic underestimation of both
observables for the near central events. We claim that a situation could be
significantly improved if an additional photon radiation that accompanies the
presence of a deconfined environment is included. Since a matter of a
spacetime layer where hadronization takes place is actively involved in
anisotropic transverse flow, both positive contributions to the spectra and
$v_2$ are considerable, albeit such an argument needs further research and
elaboration.

${SO(10)}$ inspired $Z'$ models at the LHC. (arXiv:1712.01279v2 [hepph] UPDATED)
Authors: Simon J.D. King, Stephen F. King, Stefano Moretti
We study and compare various $Z'$ models arising from $SO(10)$, focussing in
particular on the Abelian subgroup $U(1)_{R} \times U(1)_{BL}$, broken at the
TeV scale to Standard Model hypercharge $U(1)_{Y}$. The gauge group $U(1)_{R}
\times U(1)_{BL}$, which is equivalent to the $U(1)_{Y}\times U(1)_{\chi}$ in
a different basis, is well motivated from $SO(10)$ breaking and allows neutrino
mass via the linear seesaw mechanism. Assuming supersymmetry, we consider
single step gauge unification to predict the gauge couplings, then consider the
detection and characterisation prospects of the resulting $Z'$ at the LHC by
studying its possible decay modes into dileptons as well as into Higgs bosons.
The main new result here is to analyse in detail the expected leptonic
forwardbackward asymmetry at the high luminosity LHC and show that it may be
used to discriminate the $U(1)_{R} \times U(1)_{BL}$ model from the usual
$BL$ model based on $U(1)_{Y}\times U(1)_{BL}$.

Leptonrich cold QCD matter in protoneutron stars. (arXiv:1712.04773v2 [hepph] UPDATED)
Authors: J. C. Jiménez, E. S. Fraga
We investigate protoneutron star matter using the stateoftheart
perturbative equation of state for cold and dense QCD in the presence of a
fixed lepton fraction in which both electrons and neutrinos are included.
Besides computing the modifications in the equation of state due to the
presence of trapped neutrinos, we show that stable strange quark matter has a
more restricted parameter space. We also study the possibility of nucleation of
unpaired quark matter in the core of protoneutron stars by matching the
leptonrich QCD pressure onto a hadronic equation of state, namely TM1 with
trapped neutrinos. Using the inherent dependence of perturbative QCD on the
renormalization scale parameter, we provide a measure of the uncertainty in the
observables we compute.

Comprehensive asymmetric dark matter model. (arXiv:1801.05561v3 [hepph] UPDATED)
Authors: Stephen J. Lonsdale, Raymond R. Volkas
Asymmetric dark matter (ADM) is motivated by the similar cosmological mass
densities measured for ordinary and dark matter. We present a comprehensive
theory for ADM that addresses the mass density similarity, going beyond the
usual ADM explanations of similar number densities. It features an explicit
matterantimatter asymmetry generation mechanism, has one fully worked out
thermal history and suggestions for other possibilities, and meets all
phenomenological, cosmological and astrophysical constraints. Importantly, it
incorporates a deep reason for why the dark matter mass scale is related to the
proton mass, a key consideration in ADM models. Our starting point is the idea
of mirror matter, which offers an explanation for dark matter by duplicating
the standard model with a dark sector related by a $Z_2$ parity symmetry.
However, the dark sector need not manifest as a symmetric copy of the standard
model in the present day. By utilising the mechanism of "asymmetric symmetry
breaking" with two Higgs doublets in each sector, we develop a model of ADM
where the mirror symmetry is spontaneously broken, leading to an electroweak
scale in the dark sector that is significantly larger than that of the visible
sector. The weak sensitivity of the ordinary and dark QCD confinement scales to
their respective electroweak scales leads to the necessary connection between
the dark matter and proton masses. The dark matter is composed of either dark
neutrons or a mixture of dark neutrons and metastable dark hydrogen atoms.
Lepton asymmetries are generated by the $CP$violating decays of heavy Majorana
neutrinos in both sectors. These are then converted by sphaleron processes to
produce the observed ratio of visible to dark matter in the universe. The
dynamics responsible for the kinetic decoupling of the two sectors emerges as
an important issue that we only partially solve.

A Simple Worldsheet Black Hole. (arXiv:1803.00577v2 [hepth] UPDATED)
Authors: Sergei Dubovsky
We study worldsheet theory of confining strings in twodimensional massive
adjoint QCD. Similarly to confining strings in higher dimensions this theory
exhibits a nontrivial $S$matrix surviving even in the strict planar limit. In
the process of twoparticle scattering a zigzag is formed on the worldsheet. It
leads to an interesting nonlocality and exhibits some properties of a quantum
black hole. Ordinarily, identical quantum particles do not carry identity. On
the worldsheet they acquire offshell identity due to strings attached.
Identity implies complementarity. We discuss similarities and differences of
the worldsheet scattering with the $T\bar{T}$ deformation. We also propose a
promising candidate for a supersymmetric model with integrable confining
strings.

Spin polarized phases in strongly interacting matter: interplay between axialvector and tensor mean fields. (arXiv:1803.08315v2 [hepph] UPDATED)
Authors: Tomoyuki Maruyama, Eiji Nakano, Kota Yanase, Naotaka Yoshinaga
The spontaneous spin polarization of strongly interacting matter due to
axialvector and tensor type interactions is studied at zero temperature and
high baryonnumber densities. We start with the meanfield Lagrangian for the
axialvector and tensor interaction channels, and find in the chiral limit that
the spin polarization due to the tensor mean field ($U$) takes place first as
the density increases for sufficiently strong coupling constants, and then that
due to the axialvector mean field ($A$) emerges in the region of finite tensor
mean field. This can be understood that making the axialvector mean field
finite requires a broken chiral symmetry somehow, which is achieved by the
finite tensor mean field in the present case. It is also found from symmetry
argument that there appear the type I (II) NambuGoldstone modes with a linear
(quadratic) dispersion in the spin polarized phase with $U\neq0$ and $A=0$
($U\neq0$ and $A\neq0$), although these two phases exhibit the same symmetry
breaking pattern.

Zooming in on neutrino oscillations with DUNE. (arXiv:1803.10247v2 [hepph] UPDATED)
Authors: Rahul Srivastava, Christoph A. Ternes, Mariam Tórtola, José W. F. Valle
We examine the capabilities of the DUNE experiment as a probe of the neutrino
mixing paradigm. Taking the current status of neutrino oscillations and the
design specifications of DUNE, we determine the experiment's potential to probe
the structure of neutrino mixing and CP violation. We focus on the poorly
determined parameters $\theta_{23}$ and $\delta_{CP}$ and consider both two and
seven years of run. We take various benchmarks as our true values, such as the
current preferred values of $\theta_{23}$ and $\delta_{CP}$, as well as several
theorymotivated choices. We determine quantitatively DUNE's potential to
perform a precision measurement of $\theta_{23}$, as well as to test the CP
violation hypothesis in a modelindependent way. We find that, after running
for seven years, DUNE will make a substantial step in the precise determination
of these parameters, bringing to quantitative test the predictions of various
theories of neutrino mixing.

Exotic triplecharm deuteronlike hexaquarks. (arXiv:1804.02961v3 [hepph] UPDATED)
Authors: Rui Chen, FuLai Wang, Atsushi Hosaka, Xiang Liu
Adopting the onebosonexchange model, we perform a systematic investigation
of interactions between a doubly charmed baryon $(\Xi_{cc})$ and an $S$wave
charmed baryon ($\Lambda_c$, $\Sigma_c^{(*)}$, and $\Xi_c^{(\prime,*)}$). Both
the $S$$D$ mixing effect and coupledchannel effect are considered in this
work. Our results suggest that there may exist several possible triplecharm
deuteronlike hexaquarks. Meanwhile, we further study the interactions between
a doubly charmed baryon and an $S$wave anticharmed baryon. We find that a
doubly charmed baryon and an $S$wave anticharmed baryon can be easily bound
together to form shallow molecular hexaquarks. These heavy flavor hexaquarks
predicted here can be accessible at future experiment like LHCb.

Scale independence in an asymptotically free theory at finite temperatures. (arXiv:1804.09531v2 [hepph] UPDATED)
Authors: Gabriel N. Ferrari
A recently developed variational resummation technique incorporating
renormalization group properties has been shown to solve the scale dependence
problem that plagues the evaluation of thermodynamical quantities, e.g., within
the framework of approximations such as in the hardthermalloop resummed
perturbation theory. This method is used in the present work to evaluate
thermodynamical quantities within the twodimensional nonlinear sigma model,
which shares some common features with YangMills theories, like asymptotic
freedom, trace anomaly and the nonperturbative generation of a mass gap.
Besides the fact that nonperturbative results can be readily generated solely
by considering the lowestorder contribution to the thermodynamic effective
potential, we also show that its nexttoleading correction indicates
convergence to the soughtafter scale invariance.

Ruling out Critical Higgs Inflation?. (arXiv:1805.02160v2 [hepph] UPDATED)
Authors: Isabella Masina
We consider critical Higgs inflation, namely Higgs inflation with a rising
inflection point at smaller field values than those of the plateau induced by
the nonminimal coupling to gravity. It has been proposed that such
configuration is compatible with the present CMB observational constraints on
inflation, and also with primordial black hole production accounting for the
totality or a fraction of the observed dark matter. We study the model taking
into account the NNLO corrections to the Higgs effective potential: such
corrections are extremely important to reduce the theoretical error associated
to the calculation. We find that, in the 3 sigma window for the relevant low
energy parameters, which are the strong coupling and the Higgs mass (the top
mass follows by requiring an inflection point), the potential at the inflection
point is so large (and so is the Hubble constant during inflation) that the
present bound on the tensortoscalar ratio is violated. The model is viable
only allowing the strong coupling to take its upper 34 sigma value. In our
opinion, this tension shows that the model of critical Higgs inflation is
likely to be not viable: neither inflation nor black holes as dark matter can
be originated in this version of the model.

Utilising $B \to \pi K$ Decays at the HighPrecision Frontier. (arXiv:1805.06705v2 [hepph] UPDATED)
Authors: Robert Fleischer, Ruben Jaarsma, Eleftheria Malami, K. Keri Vos
For about twenty years, $B\to\pi K$ decays are in the focus of $B$decay
studies. We show that a correlation between the CP asymmetries of
$B^0_d\to\pi^0K_{\rm S}$ reveals a tension with the Standard Model. Should it
be due to New Physics, a modified electroweak penguin sector provides
particularly interesting possibilities. We present a new method to determine
the electroweak penguin parameters, which uses an isospin relation and requires
only minimal $SU(3)$ input. We apply it to the current data for $B\to\pi K$
decays and discuss the prospects for utilizing CP violation in
$B^0_d\to\pi^0K_{\rm S}$. The strategy has the exciting potential to establish
New Physics in the electroweak penguin sector in the highprecision era of
$B$physics.
