
Cosmological Constraints on Invisible Neutrino Decays Revisited. (arXiv:1907.05425v1 [hepph])
Authors: Miguel Escudero, Malcolm Fairbairn
Neutrinos could decay. Invisible neutrino decay modes are difficult to target
at laboratory experiments, and current bounds on such decays from solar
neutrino and neutrino oscillation experiments are somewhat weak. It has been
known for some time that Cosmology can serve as a powerful probe of invisible
neutrino decays. In this work, we show that in order for Big Bang
Nucleosynthesis to be successful, the invisible neutrino decay lifetime should
be $\tau_\nu > 10^{3}\,\text{s}$. We revisit Cosmic Microwave Background
constraints on invisible neutrino decays, and by using the latest Planck
observations we find that neutrino lifetimes $\tau_\nu < (1.20.3)\times
10^{9}\,\text{s} \, \left({m_\nu}/{ 0.05\,\text{eV} }\right)^3$ are excluded at
$95\%$ CL. We show that this bound is robust to modifications of the
cosmological model, in particular that it is independent of the presence of
dark radiation. We find that typical invisible neutrino decay modes with rates
$\tau_\nu < 10^{5}\,\text{s}\, \left({m_\nu}/{ 0.05\,\text{eV} }\right)^3$ are
disfavoured at more than $5\,\sigma$ with respect to $\Lambda$CDM given the
latest Planck CMB observations. Finally, we show that when including
high$\ell$ Planck polarization data, neutrino lifetimes $\tau_\nu =
(214)\times 10^{9}\,\text{s} \, \left({m_\nu}/{ 0.05\,\text{eV} }\right)^3$
are mildly preferred  with a 12 $\sigma$ significance  over neutrinos
being stable.

Polarizability of the nucleon. (arXiv:1907.05434v1 [hepph])
Authors: Martin Schumacher
The status of the experimental and theoretical investigations on the
polarizabilities of the nucleon is presented. This includes a confirmation of
the validity of the previously introduced recommended values of the
polarizabilities [1,2]. It is shown that the only meaningful approach to a
prediction of the polarizabilities is obtained from the nonsubtracted
dispersion theory, where the appropriate degrees of freedom taken from other
precise experimental data are taken in account. The present values of the
recommended polarizabilities are $\alpha_p= 12.0 \pm 0.5$, $\beta_p= 1.9 \mp
0.5$, $\alpha_n= 12.6 \pm 1.2$, $\beta_n= 2.6 \mp 1.2$ in units of
$10^{4}$fm$^3$ and $\gamma^{(p)}_\pi= 36.4 \pm 1.5$, $\gamma^{(n)}_\pi =+58.6
\pm 4.0$, $\gamma^{(p)}_0=0.58 \pm 0.20$, $\gamma^{(n)}_0= +0.38\pm 0.22$ in
units of $10^{4}$fm$^4$.

Correlations between azimuthal anisotropy Fourier harmonics in PbPb collisions at $\sqrt{s_{_{\mathrm{NN}}}}=2.76$~TeV in the HYDJET++ and AMPT models. (arXiv:1907.05450v1 [nuclth])
Authors: M. Dordevic, J. Milosevic, L. Nadderd, M. Stojanovic, F. Wang, X. Zhu
Correlations between azimuthal anisotropy Fourier harmonics $v_{n}$ ($n = 2,
3, 4$) are studied using the events from PbPb collisions at
$\sqrt{s_{_{\mathrm{NN}}}}=2.76$~TeV generated by the HYDJET++ and AMPT models,
and compared to the corresponding experimental results obtained by the ATLAS
Collaboration. The Fourier harmonics $v_{n}$ are measured over a wide
centrality range using the twoparticle azimuthal correlation method. The
slopes of the $v_{2}$$v_{3}$ correlation from both models are in a good
agreement with the ATLAS data. The HYDJET++ model predicts a stronger slope for
the $v_{2}$$v_{4}$ and $v_{3}$$v_{4}$ correlations than the ones
experimentally measured, while the results from the AMPT model are in a rather
good agreement with the experimental results. In contrast to the HYDJET++
predictions, the AMPT model predicts a boomeranglike shape in the structure of
the correlations as found in the experimental data.

On the Cottingham formula and the electromagnetic contribution to the protonneutron mass splitting. (arXiv:1907.05459v1 [nuclth])
Authors: Andre WalkerLoud
The excess mass of the neutron over the proton arises from two sources within
the Standard Model, electromagnetism and the splitting of the down and up quark
masses. The Cottingham Formula provides a means of determining the QED
corrections from the forward Compton Amplitude, but this is challenged by the
need for a subtraction function and the mixing of the QED and QCD
(electroweak) effects. I review the present understanding of the Cottingham
Formula, including a discussion on the development of the formula, its
renormalization which induces the mixing of QED and QCD effects, and the
necessary modeling of the subtraction function that must be done to arrive a
numerical prediction. I summarize the Regge Model originally proposed by Gasser
and Leutwyler and I also review the proposed model by WalkerLoud, Carlson and
Miller, which is an interpolation function between the low and high $Q^2$
regimes, both of which are anchored by rigorous theoretical underpinnings, for
which I argue a more reliable theoretical uncertainty estimate can be obtained.

Violation of the KlubergSternZuber theorem in SCET. (arXiv:1907.05463v1 [hepph])
Authors: Martin Beneke, Mathias Garny, Robert Szafron, Jian Wang
A classic result, originally due to KlubergStern and Zuber, states that
operators that vanish by the classical equation of motion (eom) do not mix into
"physical" operators. Here we show that and explain why this result does not
hold in softcollinear effective theory (SCET) for the renormalization of
powersuppressed operators. We calculate the nonvanishing mixing of eom
operators for the simplest case of $N$jet operators with a single collinear
field in every direction. The result implies thatfor the computation of the
anomalous dimension but not for onshell matrix elementsthere exists a
preferred set of fields that must be used to reproduce the infrared
singularities of QCD scattering amplitudes. We identify these fields and
explain their relation to the gaugeinvariant SCET Lagrangian. Further checks
reveal another generic property of SCET beyond leading power, which will be
relevant to resummation at the nexttoleading logarithmic level, the
divergence of convolution integrals with the hard matching coefficients. We
propose an operator solution that allows to consistently renormalize such
divergences.

Electroweak corrections to the fermionic decays of heavy Higgs states. (arXiv:1907.05468v1 [hepph])
Authors: Florian Domingo, Sebastian Paßehr
Extensions of the Standard Model often come with additional, possibly
electroweakly charged Higgs states, the prototypal example being the
TwoHiggsDoublet Model. While collider phenomenology does not exclude the
possibility for some of these new scalar fields to be light, it is relatively
natural to consider masses in the multiTeV range, in which case the only
remaining light Higgs boson automatically receives SMlike properties. The
appearance of a hierarchy between the newphysics states and the electroweak
scale then leads to sizable electroweak corrections, e. g. in the decays of the
heavy Higgs bosons, which are dominated by effects of infrared type, namely
Sudakov logarithms. Such radiative contributions obviously affect the twobody
decays, but should also be paired with the radiation of electroweak gauge
bosons (or lighter Higgs bosons) for a consistent picture at the oneloop
order. Resummation of the leading terms is also relatively easy to achieve. We
revisit these questions in the specific case of the fermionic decays of heavy
Higgs particles in the NexttoMinimal Supersymmetric Standard Model, in
particular pointing out the consequences of the threebody final states for the
branching ratios of the heavy scalars.

Astrophysical limits on very light axionlike particles from Chandra grating spectroscopy of NGC 1275. (arXiv:1907.05475v1 [hepph])
Authors: Christopher S. Reynolds, M.C. David Marsh, Helen R. Russell, Andrew C. Fabian, Robyn N. Smith, Francesco Tombesi
Axions and axionlike particles (ALPs) are a well motivated extension of the
Standard Model and are generic in String Theory. The Xray transparency of the
magnetized intracluster medium (ICM) in galaxy clusters is a powerful probe of
very light ALPs (masses $0<m_a<10^{11}\,{\rm eV}$); as Xray photons propagate
through the magnetic field of the ICM, they may undergo energydependent
quantum mechanical conversion into ALPs (and vice versa), imprinting
distortions on the observed Xray spectrum. We present new Chandra data for the
active galactic nucleus NGC1275 at the center of the Perseus cluster. Employing
the HighEnergy Transmission Gratings (HETG) with a 490ks exposure, we obtain a
highquality 19keV spectrum free from photon pileup and ICM contamination.
Apart from ironband features, the spectrum is accurately described by a
powerlaw continuum, with any spectral distortions at the $<3$% level. We
compute photon survival probabilities as a function of ALP mass $m_a$ and
ALPphoton coupling constant $g_{a\gamma}$ for an ensemble of ICM magnetic
field models, and then use the NGC1275 spectrum to derive constraints on the
$(m_a, g_{a\gamma})$plane. Marginalizing over the magnetic field realizations,
the 99.7% credible region limits the ALPphoton coupling to
$g_{a\gamma}<68\times 10^{13}\, {\rm GeV}^{1}$ (depending upon the magnetic
field model) for masses $m_a<1\times 10^{12}\,{\rm eV}$. These are the most
stringent limit to date on $g_{a\gamma}$ for these very light ALPs, and have
already reached the sensitivity limits of nextgeneration helioscopes and
lightshiningthroughwall experiments. We highlight the potential of these
studies with the nextgeneration Xray observatories Athena and Lynx, but note
the critical importance of advances in relative calibration of these future
Xray spectrometers.

A nonunitary interpretation for a single vector leptoquark combined explanation to the $B$decay anomalies. (arXiv:1907.05511v1 [hepph])
Authors: C. Hati, J. Kriewald, J. Orloff, A.M. Teixeira
In order to simultaneously account for both $R_{D^{(\ast)}}$ and
$R_{K^{(\ast)}}$ anomalies in $B$decays, we consider an extension of the
Standard Model by a single vector leptoquark field, and study how one can
achieve the required lepton flavour nonuniversality, starting from a priori
universal gauge couplings. While the unitary quarklepton mixing induced by
$SU(2)_L$ breaking is insufficient, we find that effectively nonunitary mixings
hold the key to simultaneously address the $R_{K^{(\ast)}}$ and
$R_{D^{(\ast)}}$ anomalies. As an intermediate step towards various UVcomplete
models, we show that the mixings of charged leptons with additional vectorlike
heavy leptons successfully provide a nonunitary framework to explain
$R_{K^{(\ast)}}$ and $R_{D^{(\ast)}}$. These realisations have a strong impact
for electroweak precision observables and for flavour violating ones:
isosinglet heavy lepton realisations are already excluded due to excessive
contributions to lepton flavour violating $Z$decays. Furthermore, in the near
future, the expected progress in the sensitivity of charged lepton flavour
violation experiments should allow to fully probe this class of vector
leptoquark models.

Probing observational bounds on scalartensor theories from standard sirens. (arXiv:1907.05516v1 [grqc])
Authors: Rocco D'Agostino, Rafael C. Nunes
Standard sirens are the gravitational wave (GW) analog of the astronomical
standard candles, and can provide powerful information about the dynamics of
the Universe. In this work, we simulate a catalog with 1000 standard siren
events from binary neutron star mergers, within the sensitivity predicted for
the third generation of the ground GW detector called Einstein telescope. After
correctly modifying the propagation of GWs as input to generate the catalog, we
apply our mock data set on scalartensor theories where the speed of GW
propagation is equal to the speed of light. As a first application, we find new
observational bounds on the running of the Planck mass, when considering
appropriate values within the stability condition of the theory, and we discuss
some consequences on the amplitude of the running of the Planck mass. In the
second part, we combine our simulated standard sirens catalog with other
geometric cosmological tests (Supernovae Ia and cosmic chronometers
measurements) to constrain the HuSawicki $f(R)$ gravity model. We thus find
new and nonnull deviations from the standard $\Lambda$CDM model, showing that
in the future the $f(R)$ gravity can be tested up to 95\% confidence level. The
results obtained here show that the statistical accuracy achievable by future
ground based GW observations, mainly with the ET detector (and planed detectors
with a similar sensitivity), can provide strong observational bounds on
modified gravity theories.

Neutrinos from Type Ia and failed corecollapse supernovae at dark matter detectors. (arXiv:1907.05533v1 [hepph])
Authors: Nirmal Raj
Neutrinos produced in the hot and dense interior of the next galactic
supernova would be visible at dark matter experiments in coherent elastic
nuclear recoils. While studies on this channel have focused on successful
corecollapse supernovae, a thermonuclear (Type Ia) explosion, or a
corecollapse that fails to explode and forms a black hole, are as likely to
occur as the next galactic supernova event. I show that generation3 noble
liquidbased dark matter experiments such as DARWIN and ARGO, operating at
subkeV thresholds with ionizationonly signals, would distinguish between (a)
leading hypotheses of Type Ia explosion mechanisms by detecting an
$\mathcal{O}$(1) s burst of $\mathcal{O}$(1) MeV neutrinos, and (b) progenitor
models of failed supernovae by detecting an $\mathcal{O}$(1) s burst of
$\mathcal{O}$(10) MeV neutrinos, especially by marking the instant of black
hole formation from abrupt stoppage of neutrino detection. This detection is
sensitive to all neutrino flavors and insensitive to neutrino oscillations,
thereby making measurements complementary to neutrino experiments.

Predictions of $\Upsilon(4S) \to h_b(1P,2P) \pi^+\pi^$ transitions. (arXiv:1907.05547v1 [hepph])
Authors: YunHua Chen
In this work, we study the contributions of the intermediate bottomoniumlike
$Z_b$ states and the bottom meson loops in the heavy quark spin flip
transitions $\Upsilon(4S) \to h_b(1P,2P) \pi^+\pi^$. Depending on the
constructive or destructive interferences between the $Z_b$exchange and the
bottom meson loops mechanisms, we predict two possible branching ratios for
each process: BR$_{\Upsilon(4S) \to
h_b(1P)\pi^+\pi^}\simeq\big(1.3^{+0.9}_{0.4}\times10^{6}\big)$ or $\big(
0.5^{+0.5}_{0.2}\times10^{6}\big)$, and BR$_{\Upsilon(4S) \to
h_b(2P)\pi^+\pi^}\simeq \big(9.2^{+1.8}_{1.2}\times10^{10}\big)$ or $\big(
4.4^{+0.2}_{0.3}\times10^{10}\big)$. The bottom meson loops are found to play
the leading role in the $\Upsilon(4S) \to h_b(nP) \pi\pi$ transitions, while
they can not produce decay rates comparable to the heavy quark spin conserved
$\Upsilon(4S) \to \Upsilon(1S,2S) \pi\pi$ processes.

Evaporating primordial black holes as varying dark energy. (arXiv:1907.05608v1 [astroph.CO])
Authors: Savvas Nesseris, Domenico Sapone, Spyros Sypsas
If light enough primordial black holes account for dark matter, then its
density decreases with time as they lose mass via Hawking radiation. We show
that this timedependence of the matter density can be formulated as an
equivalent $w(z)$ dark energy model and we study its implications on the
expansion history. Using our approach and comparing with the latest
cosmological data, including the supernovae type Ia, Baryon Acoustic
Oscillations, Cosmic Microwave Background and the Hubble expansion H(z) data,
we place observational constraints on the PBH model. We find that it is
statistically consistent with $\Lambda$CDM according to the AIC statistical
tool.

Effective interactions in RicciBased Gravity models below the nonmetricity scale. (arXiv:1907.05615v1 [hepth])
Authors: Adria Delhom, Victor Miralles, Ana Peñuelas
We show how minimallycoupled matter fields of arbitrary spin, when coupled
to RicciBased Gravity theories, develop nontrivial effective interactions
that can be treated perturbatively only below a characteristic highenergy
scale $\Lambda_Q$. Our results generalize to arbitrary matter fields those
recently obtained for spin 1/2 fields in \cite{Latorre:2017uve}. We then use
this interactions to set bounds on the highenergy scale $\Lambda_Q$ that
controls departures of RicciBased Gravity theories from General Relativity.
Particularly, for Eddingtoninspired BornInfeld gravity we obtain the strong
bound $ \kappa<10^{26} \text{ m}^5 \text{kg}^{1}\text{s}^{2} $.

Theory perspectives on rare Kaon decays and CPV. (arXiv:1907.05616v1 [hepph])
Authors: Giancarlo D'Ambrosio
The following proceedings contain a theory perspective on rare Kaon decays. I
review rare kaon decays in the LHC era: we discuss interplay with Banomalies
and possible New Physics in direct CP violation in $K\to 2\pi$: very rare kaon
decays like $K \to \pi \nu \bar{\nu}$ are very important to this purpose. We
discuss also the decays $K^0 \to \mu ^+ \mu ^$ due to the LHCB measurement

On Searches for Gravitational Dark Matter with Quantum Sensors. (arXiv:1907.05680v1 [hepph])
Authors: Xavier Calmet
The possibility of searching for dark matter with quantum sensors has
recently received a lot of attention. In this short paper, we discuss the
possibility of searching for gravitational dark matter with quantum sensors and
identify a very narrow window of opportunity for future quantum sensors with
improved sensitivity. Gravitational dark matter candidates with masses in the
range $[10^{3}, 1] \, \text{eV}$ could lead to an effective time variation of
the proton mass that could be measured with, e.g., future atomic clocks.

Particle Ratios within EPOS, UrQMD and Thermal Models at AGS, SPS and RHIC Energies. (arXiv:1907.05729v1 [hepph])
Authors: Mahmoud Hanafy (Benha U. and WLCAPP, Cairo), Abdel Nasser Tawfik (Nile U., ECTP and Johann Wolfgang GoetheUniversitat), Muhammad Maher (Helwan U. and WLCAPP, Cairo), Werner Scheinast (LHEP JINR, Dubna)
The particle ratios $k^+/\pi^+$, $\pi^/K^$, $\bar{p}/\pi^$,
$\Lambda/\pi^$, $\Omega/\pi^$, $p/\pi^+$, $\pi^/\pi^+$, $K^/K^+$,
$\bar{p}/p$, $\bar{\Lambda}/\Lambda$, $\bar{\Sigma}/\Sigma$, $
\bar{\Omega}/\Omega$ measured at AGS, SPS and RHIC energies are compared with
large statistical ensembles of $100,000$ events deduced from the CRMC EPOS
$1.99$ and the Ultrarelativistic Quantum Molecular Dynamics (UrQMD) hybrid
model. In the UrQMD hybrid model two types of phase transitions are taken into
account. All these are then confronted to the Hadron Resonance Gas Model. The
two types of phase transitions are apparently indistinguishable. Apart from
$k^+/\pi^+$, $k^/\pi^$, $\Omega/\pi^$, $\bar{p}/\pi^+$, and
$\bar{\Omega}/\Omega$, the UrQMD hybrid model agrees well with the CRMC EPOS
$1.99$. Also, we conclude that the CRMC EPOS $1.99$ seems to largely
underestimate $k^+/\pi^+$, $k^/\pi^$, $\Omega/\pi^$, and $\bar{p}/\pi^+$.

Monopoleantimonopole pair production by magnetic fields. (arXiv:1907.05745v1 [hepph])
Authors: Arttu Rajantie
Quantum electrodynamics predicts that in a strong electric field,
electronpositron pairs are produced by the Schwinger process, which can be
interpreted as quantum tunnelling through the Coulomb potential barrier. If
magnetic monopoles exist, monopoleantimonopole pairs would be similarly
produced in strong magnetic fields by the electromagnetic dual of this process.
The production rate can be computed using semiclassical techniques without
relying on perturbation theory, and therefore it can be done reliably in spite
of the monopoles' strong coupling to the electromagnetic field. This article
explains this phenomenon and discusses the bounds on monopole masses arising
from the strongest magnetic fields in the Universe, which are in neutron stars
known as magnetars and in heavy ion collision experiments such as leadlead
collisions carried out in November 2018 in the Large Hadron Collider at CERN.
It will also discuss open theoretical questions affecting the calculation.

On the nature of the lowestlying odd parity charmed baryon $\Lambda_c(2595)$ and $\Lambda_c(2625)$ resonances. (arXiv:1907.05747v1 [hepph])
Authors: Juan Nieves, Rafael Pavao
We study the structure of the $\Lambda_c(2595)$ and $\Lambda_c(2625)$
resonances in the framework of an effective field theory consistent with heavy
quark spin and chiral symmetries, that incorporates the interplay between
$\Sigma_c^{(*)}\piND^{(*)}$ baryonmeson degrees of freedom and bare Pwave
$c\bar ud$ quarkmodel states. We show that these two resonances are not HQSS
partners. The $J^P= 3/2^$ $\Lambda_c(2625)$ should be viewed mostly as a
dressed three quark state, whose origin is determined by a bare state,
predicted to lie very close to the mass of the resonance. The $J^P= 1/2^$
$\Lambda_c(2595)$ seems to have, however, a predominant molecular structure.
This is because, it is either the result of the chiral $\Sigma_c\pi$
interaction, which threshold is located much more closer than the mass of the
bare threequark state, or because the light degrees of freedom in its inner
structure are coupled to the unnatural $0^$ quantumnumbers. We show that both
situations can occur depending on the renormalization procedure used. We find
some additional states, but the classification of the spectrum in terms of HQSS
is difficult, despite having used interactions that respect this symmetry. This
is because the bare quarkmodel state and the $\Sigma_c\pi$ threshold are
located extraordinarily close to the $\Lambda_c(2625)$ and $\Lambda_c(2595)$,
respectively, and hence they play totally different roles in each sector.

Scalar dark matter coannihilating with a coloured fermion. (arXiv:1907.05766v1 [hepph])
Authors: Simone Biondini, Stefan Vogl
We analyze the phenomenology of a simplified model for a real scalar dark
matter candidate interacting with quarks via a coloured fermionic mediator. In
the coannihilation regime, the dark matter abundance is controlled by the
dynamics of the coloured fermions which can be significantly affected by
nonperturbative effects. We employ a nonrelativistic effective field theory
which allows us to systematically treat the Sommerfeld effect and bound state
formation in the early Universe. The parameter space compatible with the dark
matter relic abundance is confronted with direct, indirect and collider
searches. A substantial part of the parameter space, with dark matter masses up
to 18 TeV, is already excluded by XENON1T. Most of the remaining thermal relics
can be probed by a future Darwinlike experiments, when taking properly into
account the running of the relevant couplings for the direct detection
processes.

Associated production of a Higgs boson decaying into bottom quarks and a weak vector boson decaying leptonically at NNLO in QCD. (arXiv:1907.05836v1 [hepph])
Authors: R. Gauld, A. GehrmannDe Ridder, E. W. N. Glover, A. Huss, I. Majer
We present the calculation of nexttonexttoleading order (NNLO)
corrections in perturbative QCD for the production of a Higgs boson decaying
into a pair of bottom quarks in association with a leptonically decaying weak
vector boson: $\mathrm{pp} \to V \mathrm{H} + X \to
\ell\bar{\ell}\;\mathrm{b\bar{b}} + X$. We consider the corrections to both the
production and decay subprocesses, retaining a fully differential description
of the final state including offshell propagators of the Higgs and vector
boson. The calculation is carried out using the antenna subtraction formalism
and is implemented in the NNLOJET framework. Clustering and identification of
$\mathrm{b}$jets is performed with the flavour$k_t$ algorithm and results for
fiducial cross sections and distributions are presented for the LHC at
$\sqrt{s}=13\;\text{TeV}$. We assess the residual theory uncertainty by varying
the production and decay scales independently and provide scale uncertainty
bands in our results, yielding percentlevel accurate predictions for
observables in this Higgs production mode computed at NNLO. Confronting a
na\"ive perturbative expansion of the cross section against the customary
rescaling procedure to a fixed branching ratio reveals that starting from
NNLO, the latter could be inadequate in estimating missing higherorder effects
through scale variations.

A Goldilocks Higgs. (arXiv:1907.05837v1 [hepth])
Authors: Nemanja Kaloper, Alexander Westphal
If the Higgs is not a CP eigenstate, it can couple to a topological 4form
sector which yields a complex vacuum structure. In many of the Higgs vacua
electroweak symmetry is unbroken. In just as many it breaks when the 4form
flux is large enough. For a fixed value of flux, the symmetry breaking vacua
have a smaller vacuum energy than the symmetric ones, where the difference is
quantized because it is set by the 4form flux. This leads to the possibility
that there is a value of the 4form flux for any UV contributions to the Higgs
vev that automatically cancels it down to the right value, $\sim$ TeV, if the
4form charges are quantized in the units of the electroweak scale. This would
still leave the cosmological constant which could be selected anthropically.

Neutral and charged pion properties under strong magnetic fields in the NJL model. (arXiv:1907.05840v1 [hepph])
Authors: M. Coppola, D. Gomez Dumm, S. Noguera, N.N. Scoccola
In the framework of the NambuJonaLasino (NJL) model, we study the effect
of an intense external uniform magnetic field on neutral and charged pion
masses and decay form factors. In particular, the treatment of charged pions is
carried out on the basis of the Ritus eigenfunction approach to magnetized
relativistic systems. Our analysis shows that in the presence of the magnetic
field three and four nonvanishing piontovacuum hadronic form factors can be
obtained for the case of the neutral and charged pions, respectively. As
expected, it is seen that for nonzero magnetic field the $\pi^0$ meson can
still be treated as a pseudo NambuGoldstone boson, and consequently the
corresponding form factors are shown to satisfy various chiral relations. For
definite parametrizations of the model, numerical results for $\pi^0$ and
$\pi^\pm$ masses and decay constants are obtained and compared with previous
calculations given in the literature.

Compact star properties from an extended linear sigma model. (arXiv:1907.05841v1 [hepph])
Authors: János Takátsy, Péter Kovács, Zsolt Szép, György Wolf
The equation of state provided by effective models of strongly interacting
matter should comply with the restrictions imposed by current astrophysical
observations of compact stars. Using the equation of state given by the
(axial)vector meson extended linear sigma model, we determine the massradius
relation and study whether these restrictions are satisfied under the
assumption that most of the star is filled with quark matter. We also compare
the massradius sequence with those given by the equations of state of somewhat
simpler models.

Flavor changing neutral current decays $t\to c X$ ($X=\gamma,\,g,\, Z,\, H$) and $t\to c\bar \ell\ell $ ($\ell=\mu,\,\tau$) via scalar leptoquarks. (arXiv:1907.05877v1 [hepph])
Authors: A. Bolaños, R. SánchezVélez, G. TavaresVelasco
The flavor changing neutral current decays $t\to c X$ ($X=\gamma,\,g,\, Z,\,
H$) and $t\to c\bar \ell\ell $ ($\ell=\mu,\,\tau$) are studied in a
renormalizable scalar leptoquark (LQ) model with no proton decay, where a
scalar $SU(2)$ doublet with hypercharge $Y=7/6$ is added to the standard model,
yielding a nonchiral LQ $\Omega_{5/3}$. Analytical results for the oneloop
(treelevel) contributions of a scalar LQ to the $f_i\to f_j X$ ($f_i\to f_j
\bar f_m f_l$) decays, with $f_a=q_a, \ell_a$, are presented. We consider the
scenario where $\Omega_{5/3}$ couples to the fermions of the second and third
families, with its right and lefthanded couplings obeying $\lambda_R^{\ell
u_i}/\lambda_L^{\ell u_i}=O(\epsilon)$, where $\epsilon$ parametrizes the
relative size between these couplings. The allowed parameter space is then
found via the current constraints on the muon $(g2)$, the $\tau\to \mu\gamma$
decay, the LHC Higgs boson data, and the direct LQ searches at the LHC. For
$m_{\Omega_{5/3}}=1$ TeV and $\epsilon=10^{3}$, we find that the $t\to c X$
branching ratios are of similar size and can be as large as $10^{8}$ in a tiny
area of the parameter space, whereas ${\rm Br}(t\to c\bar \tau\tau)$ [${\rm
Br}(t\to c\bar \mu\mu)$] can be up to $10^{6}$ ($10^{7}$).

Sterile neutrinos influence on oscillation characteristics of active neutrinos at short distances in the generalized model of neutrino mixing. (arXiv:1806.05922v3 [hepph] UPDATED)
Authors: V. V. Khruschov, S. V. Fomichev
A phenomenological model with active and sterile neutrinos is used for
calculations of neutrino oscillation characteristics at the normal mass
hierarchy of active neutrinos. Taking into account the contributions of sterile
neutrinos, appearance and survival probabilities for active neutrinos are
calculated. Modified graphical dependencies for the probability of appearance
of electron neutrinos/antineutrinos in muon neutrino/antineutrino beams as a
function of the ratio of the distance to the neutrino energy and other model
parameters are obtained. It is shown that in the case of a certain type mixing
between active and sterile neutrinos it is possible to clarify some features of
the anomalies of neutrino data at short distances. A new parametrization for a
particular type mixing matrix of active and sterile neutrinos that takes into
account the additional sources of CP violation is used. The comparison with the
existing experimental data is performed and, with using this knowledge, the
estimates of some model parameters are found. The theoretical results obtained
for mixing of active and sterile neutrinos can be applied for interpretation
and prediction of results of groundbased experiments on search of sterile
neutrinos as well as for analyses of some astrophysical data.

Neutrino masses, cosmological inflation and dark matter in a $U(1)_{BL}$ model with type II seesaw mechanism. (arXiv:1807.02204v3 [hepph] UPDATED)
Authors: J. G. Rodrigues, A. C. O. Santos, J. G. Ferreira Jr, C. A. de S. Pires
In this work we implement the type II seesaw mechanism into the framework of
the $U(1)_{BL}$ gauge model. As main gain, the righthanded neutrinos of the
model get free to play the role of the dark matter of the universe. As side
effect, the model realizes Higgs inflation without problem with loss of
unitarity.

Anyonic particlevortex statistics and the nature of dense quark matter. (arXiv:1808.04827v3 [hepth] UPDATED)
Authors: Aleksey Cherman, Srimoyee Sen, Laurence G. Yaffe
We show that $\mathbb{Z}_3$valued particlevortex braiding phases are
present in high density quark matter. Certain mesonic and baryonic excitations,
in the presence of a superfluid vortex, have orbital angular momentum quantized
in units of $\hbar/3$. Such nonlocal topological features can distinguish
phases whose realizations of global symmetries, as probed by local order
parameters, are identical. If $\mathbb{Z}_3$ braiding phases and angular
momentum fractionalization are absent in lower density hadronic matter, as is
widely expected, then the quark matter and hadronic matter regimes of dense QCD
must be separated by at least one phase transition.

Coupling QCDscale axionlike particles to gluons. (arXiv:1811.03474v2 [hepph] UPDATED)
Authors: Daniel Aloni, Yotam Soreq, Mike Williams
We present a novel datadriven method for determining the hadronic
interaction strengths of axionlike particles (ALPs) with QCDscale masses.
Using our method, it is possible to calculate the hadronic production and decay
rates of ALPs, along with many of the largest ALP decay rate to exclusive final
states. To illustrate the impact on QCDscale ALP phenomenology, we consider
the scenario where the ALPgluon coupling is dominant over the ALP coupling to
photons, electroweak bosons, and all fermions for $m_{\pi} \lesssim m_a
\lesssim 3$ GeV. We emphasize, however, that our method can easily be
generalized to any set of ALP couplings to SM particles. Finally, using the
approach developed here, we provide calculations for the branching fractions of
$\eta_c \to VV$ decays, i.e. $\eta_c$ decays into two vector mesons, which are
consistent with the known experimental values.

Constraints on Mediator Coupled to Heavy Quarks from LHC Data. (arXiv:1903.00496v2 [hepph] UPDATED)
Authors: Manuel Drees, Zhongyi Zhang
We apply LHC data to constrain a simplified extension of the Standard Model
containing a new spin1 mediator $R$, which does not couple to first generation
quarks, and a spinor dark matter particle $\chi$. We recast ATLAS and CMS
searches for final states containing one or more jet(s) + missing $E_T$, with
or without $b$ tags, as well as searches for dijet resonances with $b$ or $t$
tagging. We find that LHC constraints on the axial vector couplings of the
mediator are always stronger than the unitarity bound, which scales like
$m_R/m_t$. If $R$ has a sizable invisible branching ratio, the strongest LHC
bound on both vector couplings and axial vector coupling comes from a dijet +
missing $E_T$ search with or without double $b$ tag. These bounds are quite
strong for $m_R < 1$ TeV, even though we have switched off all couplings to
valence quarks. Searches for a dijet resonance with double $b$ tag lead to
comparable bounds with the previous results even if $R \rightarrow \chi \bar
\chi$ decays are allowed; these are the only sensitive LHC searches if the
invisible branching ratio of $R$ is very small or zero.

Reconstructing the EFT of Inflation from Cosmological Data. (arXiv:1904.00991v2 [astroph.CO] UPDATED)
Authors: Amel Durakovic, Paul Hunt, Subodh P. Patil, Subir Sarkar
Reconstructions of the primordial power spectrum (PPS) of curvature
perturbations from cosmic microwave background anisotropies and largescale
structure data suggest that the usually assumed powerlaw PPS has localised
features (up to $\sim 10\%$ in amplitude), although of only marginal
significance in the framework of $\Lambda$CDM cosmology. On the other hand if
the underlying cosmology is assumed to be Einsteinde Sitter, larger features
in the PPS (up to $\sim 20\%$) are required to accurately fit the observed
acoustic peaks. Within the context of single clock inflation, we show that any
given reconstruction of the PPS can be mapped on to functional parameters of
the underlying effective theory of the adiabatic mode within a 2ndorder
formalism, provided the best fit fractional change of the PPS,
$\Delta\mathcal{P}_\mathcal{R}/\mathcal{P}_\mathcal{R}$ is such that
$(\Delta\mathcal{P}_\mathcal{R}/\mathcal{P}_\mathcal{R})^3$ falls within the
$1\,\sigma$ confidence interval of the reconstruction for features induced by
variations of either the sound speed $c_\mathrm{s}$ or the slowroll parameter
$\epsilon$. Although there is a degeneracy amongst these functional parameters
(and the models that project onto them), we can identify simple representative
inflationary models that yield such features in the PPS. Thus we provide a
dictionary (more accurately, a thesaurus) to go from observational data, via
the reconstructed PPS, to models that reproduce them to per cent level
precision.

$H \rightarrow b\overline{b}j$ at NexttoNexttoLeading Order Accuracy. (arXiv:1904.08961v3 [hepph] UPDATED)
Authors: Roberto Mondini, Ciaran Williams
We present the calculation of the decay $H \rightarrow b\overline{b}j$ at
nexttonexttoleading order (NNLO) accuracy. We consider contributions in
which the Higgs boson couples directly to bottom quarks, i.e. our predictions
are accurate to order $\mathcal{O}(\alpha_s^3 y_b^2)$ . We calculate the
various components needed to construct the NNLO contribution, including an
independent calculation of the twoloop amplitudes. We compare our results for
the twoloop amplitudes to an existing calculation finding agreement. We
present multiple checks on our twoloop expression using the known infrared
factorization properties as the emitted gluon becomes soft or collinear. We use
our results to construct a Monte Carlo implementation of $H \rightarrow
b\overline{b}j$ and present jet rates and differential distributions in the
Higgs rest frame using the Durham jet algorithm.

Towards testing CMB anomalies using the kinetic and polarized Sunyaev Zel'dovich effects. (arXiv:1904.10981v2 [astroph.CO] UPDATED)
Authors: Juan I. Cayuso, Matthew C. Johnson
Measurements of the Cosmic Microwave Background (CMB) temperature
anisotropies on large angular scales have uncovered a number of anomalous
features of marginal statistical significance, such as a hemispherical power
asymmetry, lack of power on large angular scales, and features in the power
spectrum. Because the primary CMB temperature has been measured at the cosmic
variance limit, determining if these anomalies are hints of new physics as
opposed to foregrounds, systematics, or simply statistical flukes, requires new
observables. In this paper, we highlight the potential contribution that future
measurements of the kinetic SunyaevZel'dovich effect (kSZ) and the polarized
Sunyaev Zel'dovich effect (pSZ) could make in determining the physical nature
of several CMB anomalies. The kSZ and pSZ effects, temperature and polarization
anisotropies induced by scattering from free electrons in the reionized
Universe, are the dominant blackbody contribution to the CMB on small angular
scales. Using the technique of SZ tomography, measurements of kSZ and pSZ
effects can be combined with galaxy surveys to reconstruct the remote CMB
dipole and quadrupole fields, providing a 3dimensional probe of large scale
modes inside our Hubble volume. Building on previous work, we forecast the
additional constraining power that these observables might offer for a
representative set of anomaly models. We find that the remote CMB dipole and
quadrupole contain a similar amount of information on anomaly models as the
primary CMB polarization. The information from CMB temperature, polarization,
and the remote dipole and quadrupole fields is complementary, and the full set
of observables can improve constraints on anomaly models by a factor of $\sim
24$ using nextgeneration CMB experiments and galaxy surveys. This could be
sufficient to definitively establish the physical origin of several CMB
anomalies.

Landau and Eckart frames for relativistic fluids in nuclear collisions. (arXiv:1904.11940v2 [nuclth] UPDATED)
Authors: Akihiko Monnai
The quark matter created in relativistic nuclear collisions is interpreted as
a nearlyperfect fluid. The recent efforts to explore its finitedensity
properties in the beam energy scan programs motivate one to revisit the issue
of the local rest frame fixing in offequilibrium hydrodynamics. I first
investigate full secondorder relativistic hydrodynamics in the Landau and the
Eckart frames. Then numerical hydrodynamic simulations are performed to
elucidate the effect of frame choice on flow observables in relativistic
nuclear collisions. The results indicate that the flow can differ in the Landau
and the Eckart frames but charged particle and net baryon rapidity
distributions are mostly frame independent when offequilibrium kinetic
freezeout is considered.

Supervised deep learning in high energy phenomenology: a mini review. (arXiv:1905.06047v2 [hepph] UPDATED)
Authors: Murat Abdughani, Jie Ren, Lei Wu, Jin Min Yang, Jun Zhao
Deep learning, a branch of machine learning, have been recently applied to
high energy experimental and phenomenological studies. In this note we give a
brief review on those applications using supervised deep learning. We first
describe various learning models and then recapitulate their applications to
high energy phenomenological studies. Some detailed applications are delineated
in details, including the machine learning scan in the analysis of new physics
parameter space, the graph neural networks in the search of topsquark
production and in the $CP$ measurement of the topHiggs coupling at the LHC.

Radiative transitions and magnetic moments of the charmed and bottom vector mesons in chiral perturbation theory. (arXiv:1905.07742v2 [hepph] UPDATED)
Authors: Bo Wang, Bin Yang, Lu Meng, ShiLin Zhu
In this work, we systematically study the radiative decays and magnetic
moments of the charmed and bottom vector mesons with chiral perturbation theory
up to oneloop level. We present the results in SU(2) and SU(3) cases with the
mass splitting in loop diagrams kept and unkept, respectively. The obtained
decay rates for $D^\ast$ and $B^\ast$ mesons in SU(3) case with the mass
splitting kept are: $\Gamma_{\bar{D}^{\ast 0}\to
\bar{D}^0\gamma}=16.2^{+6.5}_{6.0}$ keV, $\Gamma_{D^{\ast}\to
D^\gamma}=0.73^{+0.7}_{0.3}$ keV, $\Gamma_{D_s^{\ast}\to D_s^\gamma}=
0.32^{+0.3}_{0.3}$ keV, and $\Gamma_{B^{\ast+}\to
B^+\gamma}=0.58^{+0.2}_{0.2}$ keV, $\Gamma_{B^{\ast0}\to
B^0\gamma}=0.23^{+0.06}_{0.06}$ keV, $\Gamma_{B_s^{\ast0}\to
B_s^0\gamma}=0.04^{+0.03}_{0.03}$ keV. The decay width for $D^{\ast}\to
D^\gamma$ is consistent with the experimental measurement. As a byproduct, the
full widths of $\bar{D}^{\ast0}$ and $D_s^{\ast}$ are
$\Gamma_{\mathrm{tot}}(\bar{D}^{\ast0})\simeq77.7^{+26.7}_{20.5}~\mathrm{keV}$
and $
\Gamma_{\mathrm{tot}}(D_s^{\ast})\simeq0.62^{+0.45}_{0.50}~\mathrm{keV}$,
respectively. We also calculate the magnetic moments of the heavy vector
mesons. The analytical chiral expressions derived in our work shall be helpful
for the extrapolations of lattice QCD simulations in the coming future.

Hunting for extra dimensions in the shadow of M87*. (arXiv:1905.12421v3 [grqc] UPDATED)
Authors: Sunny Vagnozzi, Luca Visinelli
The Event Horizon Telescope has recently provided the first image of the dark
shadow around the supermassive black hole M87*. The observation of a highly
circular shadow provides strong limits on deviations of M87*'s quadrupole
moment from the Kerr value. We show that the absence of such a deviation can be
used to constrain the physics of extra dimensions of spacetime. Focusing on the
RandallSundrum AdS$_5$ braneworld scenario, we show that the observation of
M87*'s dark shadow sets the limit $\ell \lesssim 170\,{\rm AU}$, where $\ell$
is the AdS$_5$ curvature radius. This limit is among the first quantitative
constraints on exotic physics obtained from the extraordinary first ever image
of the dark shadow of a black hole.

The CPTviolating effects on neutron's gravitational bound state. (arXiv:1906.00146v3 [hepph] UPDATED)
Authors: Zhi Xiao
In this paper, the CPTviolating (CPTV) spin interactions on neutron's
gravitational bound state are studied. The helicitydependent phase evolution
due to $\vec{\sigma}\cdot\vec{\tilde{b}}$ and $\vec{\sigma}\cdot\hat{\vec{p}}$
couplings is transparently demonstrated with analytical solutions. The
consequent phenomena include not only spin precession and the azimuthal angle
$\theta$ and $\phi$dependent probability variation, but also
transitionfrequency shifts between different gravitational bound states. The
$\theta$ and $\phi$ timedependences due to the Earth motion may lead to
sidereal variation of the probability profile, a clear signal of Lorentz
violation. We also utilize the gravitational transition frequencies measured
precisely in the qBounce experiment \cite{GRS} to obtain the rough bound
$\vec{\tilde{b}}<6.9\times10^{21}$GeV. Incorporating known systematic errors
or using polarized neutron beams may lead to more robust and tighter
constraints.

Quasistable charginos in ultraperipheral protonproton collisions at the LHC. (arXiv:1906.08568v2 [hepph] UPDATED)
Authors: S. I. Godunov, V. A. Novikov, A. N. Rozanov, M.I. Vysotsky, E. V. Zhemchugov
We propose an approach for the search of charged longlived particles
produced in ultraperipheral collisions at the LHC. The main idea is to improve
event reconstruction at ATLAS and CMS with the help of their forward detectors.
Detection of both scattered protons in forward detectors allows complete
recovery of event kinematics. Though this requirement reduces the number of
events, it greatly suppresses the background, including the strong background
from the pileup.

Hypercharge Quantisation and Fermat's Last Theorem. (arXiv:1907.00514v2 [hepth] UPDATED)
Authors: Nakarin Lohitsiri, David Tong
What values of the Standard Model hypercharges result in a mathematically
consistent quantum field theory? We show that the constraints imposed by the
lack of gauge anomalies can be recast as the equation x^3 + y^3 = z^3. If
hypercharge is quantised, then x, y and z must be integers. The trivial (and
only) solutions, with x=0 or y=0, reproduce the hypercharge assignments seen in
Nature. This argument does not rely on the mixed gaugegravitational anomaly,
which is automatically vanishing if hypercharge is quantised and the gauge
anomalies vanish.

Baryon as a Quantum Hall Droplet and the Cheshire Cat Principle. (arXiv:1907.00958v2 [hepth] UPDATED)
Authors: YongLiang Ma, Maciej A. Nowak, Mannque Rho, Ismail Zahed
We show that the recent proposal to describe the $N_f=1$ baryon in the large
number of color limit as a quantum Hall droplet, can be understood as a chiral
bag in a 1+2 dimensional strip using the Cheshire cat principle. For a small
bag radius, the bag reduces to a vortex line which is the smile of the cat with
flowing gapless quarks all spinning in the same direction. The disc enclosed by
the smile is described by a topological field theory due to the CallanHarvey
anomaly outflow. The chiral bag carries naturally unit baryon number and spin
$\frac 12 N_c$. The generalization to arbitrary $N_f$ is discussed.

Circularly Polarized Gamma Rays in Effective Dark Matter Theory. (arXiv:1907.02402v2 [hepph] UPDATED)
Authors: WeiChih Huang, KinWang Ng, TzuChiang Yuan
We study the loopinduced circularly polarized gamma rays from dark matter
annihilation using the effective dark matter theory approach. Both neutral
scalar and fermionic dark matter annihilating into monochromatic diphoton and
$Z$photon final states are considered. To generate the circular polarization
asymmetry, $P$ and $CP$ symmetries must be violated in the couplings between
dark matter and Standard Model fermions inside the loop with nonvanishing
Cutkosky cut. The asymmetry can be sizable especially for $Z$photon final
state for which asymmetry of nearly $90\%$ can be reached. We discuss the
prospect for detecting the circular polarization asymmetry of the gammaray
flux from dark matter annihilation in the Galactic Center in future gammaray
polarimetry experiments.
