
Gauge and gravitational instantons: From 3forms and fermions to Weak Gravity and flat axion potentials. (arXiv:1906.07728v1 [hepth])
Authors: Arthur Hebecker, Philipp Henkenjohann
We investigate the role of gauge and gravitational instantons in the context
of the Swampland program. Our focus is on the global symmetry breaking they
induce, especially in the presence of fermions. We first recall and make more
precise the description of the dilute instanton gas through a 3form gauge
theory. In this language, the familiar suppression of instanton effects by
light fermions can be understood as the decoupling of the 3form. Even if all
fermions remain massive, such decoupling may occur on the basis of an
explicitly unbroken but anomalous global symmetry in the fermionic sector. This
should be forbidden by quantum gravity, which leads us to conjecture a related,
cutoffdependent lower bound on the induced axion potential. Finally, we note
that the gravitational counterpart of the above are K3 instantons. These are
small fluctuations of Euclidean spacetime with K3 topology, which induce
fermionic operators analogous to the 't Hooft vertex in gauge theories.
Although Plancksuppressed, they may be phenomenologically relevant if
accompanied by other higherdimension fermion operators or if the K3 carries
appropriate gauge fluxes.

Constraining the primordial black hole abundance with 21cm cosmology. (arXiv:1906.07735v1 [astroph.CO])
Authors: Olga Mena, Sergio PalomaresRuiz, Pablo VillanuevaDomingo, Samuel J. Witte
The discoveries of a number of binary black hole mergers by LIGO and VIRGO
has reinvigorated the interest that primordial black holes (PBHs) of tens of
solar masses could contribute nonnegligibly to the dark matter energy density.
Should even a small population of PBHs with masses $\gtrsim
\mathcal{O}(M_\odot)$ exist, they could profoundly impact the properties of the
intergalactic medium and provide insight into novel processes at work in the
early Universe. We demonstrate here that observations of the 21cm transition in
neutral hydrogen during the epochs of reionization and cosmic dawn will likely
provide one of the most stringent tests of solar mass PBHs. In the context of
21cm cosmology, PBHs give rise to three distinct observable effects:
${\textit{(i)}}$ the modification to the primordial power spectrum (and thus
also the halo mass function) induced by Poisson noise, ${\textit{(ii)}}$ a
uniform heating and ionization of the intergalactic medium via Xrays produced
during accretion, and ${\textit{(iii)}}$ a local modification to the
temperature and density of the ambient medium surrounding isolated PBHs. Using
a fourparameter astrophysical model, we show that experiments like SKA and
HERA could potentially improve upon existing constraints derived using
observations of the cosmic microwave background by more than one order of
magnitude.

Constraining primordial black hole abundance with the Galactic 511 keV line. (arXiv:1906.07740v1 [astroph.CO])
Authors: William DeRocco, Peter W. Graham
Models in which dark matter consists entirely of primordial black holes
(PBHs) with masses around $10^{17}$ g are currently unconstrained. However, if
PBHs are a component of the Galactic dark matter density, they will inject a
large flux of energetic particles into the Galaxy as they radiate. Positrons
produced by these black holes will subsequently propagate throughout the Galaxy
and annihilate, contributing to the Galactic 511 keV line. Using measurements
of this line by SPI/INTEGRAL as a constraint on PBH positron injection, we
place new limits on PBH abundance in the mass range $10^{16}  10^{17}$ g,
ruling out models in which these PBHs constitute the entirety of dark matter.

Naturalness versus stringy naturalness (with implications for collider and dark matter searches. (arXiv:1906.07741v1 [hepph])
Authors: Howard Baer, Vernon Barger, Shadman Salam
The notion of stringy naturalness that an observable O_2 is more natural
than O_1 if more (phenomenologically acceptable) vacua solutions lead to
O_2 rather than O_1 is examined within the context of the Standard Model
(SM) and various SUSY extensions: CMSSM/mSUGRA, highscale SUSY and
radiativelydriven natural SUSY (RNS). Rather general arguments from string
theory suggest a (possibly mild) statistical draw towards vacua with large soft
SUSY breaking terms. These vacua must be tempered by an anthropic veto of
nonstandard vacua or vacua with too large a value of the weak scale m(weak).
We argue that the SM, the CMSSM and the various highscale SUSY models are all
expected to be relatively rare occurances within the string theory landscape of
vacua. In contrast, models with TeVscale soft terms but with m(weak)~100 GeV
and consequent light higgsinos (SUSY with radiativelydriven naturalness)
should be much more common on the landscape. These latter models have a
statistical preference for m_h~ 125 GeV and strongly interacting sparticles
beyond current LHC reach. Thus, while conventional naturalness favors
sparticles close to the weak scale, stringy naturalness favors sparticles so
heavy that electroweak symmetry is barely broken and one is living dangerously
close to vacua with chargeorcolor breaking minima, no electroweak breaking or
pocket universe weak scale values too far from our measured value. Expectations
for how landscape SUSY would manifest itself at collider and dark matter search
experiments are then modified compared to usual notions.

QCD evolution of the orbital angular momentum of quarks and gluons: Genuine twistthree part. (arXiv:1906.07744v1 [hepph])
Authors: Yoshitaka Hatta, Xiaojun Yao
We present the numerical solution of the oneloop QCD evolution equation for
the genuine twistthree part of the orbital angular momentum (OAM)
distributions of quarks and gluons inside a longitudinally polarized nucleon.
This is based on the observation that the evolution is identical to that of the
EfremovTeryaevQiuSterman function for transverse single spin asymmetry.
Together with the known evolution of the WandzuraWilczek part, the oneloop
evolution of OAM distributions is now practically under control. We also study,
for the first time, the scale dependence of the potential angular momentum
defined as the difference between the Ji and JaffeManohar definitions of OAM.

CP Violation in ${\bar B}^0 \to D^{*+} \ell^ {\bar\nu}_\ell$. (arXiv:1906.07752v1 [hepph])
Authors: David London
At present, there are discrepancies with the predictions of the standard
model in ${\bar B}^0 \to D^{*+} \ell^ {\bar\nu}_\ell$ decays, hinting at the
presence of new physics (NP) in $b \to c \tau^ {\bar\nu}$. Various NP models
have been proposed to explain the data. In this talk, I discuss how the
measurement of CPviolating observables in ${\bar B}^0 \to D^{*+} \ell^
{\bar\nu}_\ell$ can be used to differentiate the NP scenarios.

Status of isospin splittings in mesons and baryons. (arXiv:1906.07799v1 [hepph])
Authors: Marek Karliner, Jonathan L. Rosner
Current measurements of isospin splittings in mesons and baryons are
sufficiently precise that they allow estimates of the mass difference between
constituent up and down quarks. Some previous results are updated in the light
of these new measurements, and the importance of better measurements of some
observables such as $M(K^{*\pm})$, $M(B^{*0})M(B^0)$, and isospin splittings
in bottom baryons is noted.

Flavor changing Flavon decay $\phi\to tc$ ($\phi=H_F,\,A_F$) at the highluminosity large hadron collider. (arXiv:1906.07821v1 [hepph])
Authors: M. A. ArroyoUreña, A. FernándezTéllez, G. TavaresVelasco
We present a study of the flavor changing decays $\phi\to tc$ of the
$CP$even and $CP$odd scalar Flavons $H_F$ and $A_F$ at the High Luminosity
Large Hadron Collider (HLLHC) in the framework of an extension of the standard
model that incorporates an extra complex singlet and invokes the
FroggattNielsen mechanism with an Abelian flavor symmetry. A Monte Carlo
analysis of the signal and the standard model background is presented for a
centerofmass energy of $\sqrt{s}=14$ TeV and integrated luminosities in the
3003000 fb$^{1}$ interval. Constraints on the parameter space of the model
from the Higgs boson coupling modifiers $\kappa_i$ are obtained and used to
evaluate the Flavon decay widths and the $gg\to\phi\to tc$ production cross
section. We analyze the dominant background by considering realistic acceptance
cuts, tagging and misstagging efficiencies, etc. It is found that with the
current integrated luminosity achieved at the LHC, the $A_F\to tc$ decay is out
of the reach of detection. However, in the HLLHC, such a decay could be at the
reach of detection for $m_{A_F}=200500$ GeV once an integrated luminosity of
about 1000 fb$^{1}$ is achieved. On the other hand, since the branching ratio
of the $H_F\to tc$ decay is suppressed by two orders of magnitude as compared
to that of the $A_F\to tc$ decay, it seems to be out of the reach of detection
even in the HLLHC.

Algorithm to find an allorder in the running coupling solution to an equation of the DGLAP type. (arXiv:1906.07924v1 [hepph])
Authors: Igor Kondrashuk
We propose an algorithm to find a solution to an integrodifferential
equation of the DGLAP type for all the orders in the running coupling $\alpha$
with splitting functions given at a fixed order in $\alpha.$ Complex analysis
is significantly used in the construction of the algorithm, we found a simpler
way to calculate the involved integrals over contours in the complex planes
than by any of the methods known at present.

Visible narrow cusp structure in $\Lambda_c^+\to p K^ \pi^+$ enhanced by triangle singularity. (arXiv:1906.07942v1 [hepph])
Authors: XiaoHai Liu, Gang Li, JuJun Xie, Qiang Zhao
A resonancelike structure as narrow as 10 MeV is observed in the $K^p$
invariant mass distributions in $\Lambda_c^+\to p K^ \pi^+$ at Belle. Based on
the large data sample of about 1.5 million events and the small bin width of
just 1 MeV for the $K^p$ invariant mass spectrum, the narrow peak is found
precisely lying at the $\Lambda\eta$ threshold. While lacking evidence for a
quark model state with such a narrow width at this mass region, we find that
this narrow structure can be naturally identified as a threshold cusp but
enhanced by the nearby triangle singularity via the $\Lambda$$a_0(980)^+$ or
$\eta$$\Sigma(1660)^+$ rescatterings.

On the selfconsistency of offshell SlavnovTaylor identities in QCD. (arXiv:1906.07996v1 [hepth])
Authors: J.A. Gracey, H. Kissler, D. Kreimer
Using Hopfalgebraic structures as well as diagrammatic techniques for
determining the SlavnovTaylor identities for QCD we construct the relations
for the triple and quartic gluon vertices at one loop. By making the
longitudinal projection on an external gluon of a Green's function we show that
the gluon selfenergy of that leg is consistently replaced by a ghost
selfenergy. The resulting identities are then studied by evaluating all the
graphs for an offshell nonexceptional momentum configuration. In the case of
the 3point function this is for the most general momentum case and for the
4point function we consider the fully symmetric point.

Revisiting instabilities of $S^1/Z_2$ models with loopinduced FayetIliopoulos terms. (arXiv:1906.08002v1 [hepth])
Authors: Hiroyuki Abe, Tatsuo Kobayashi, Shohei Uemura, Junji Yamamoto
We study FayetIliopoulos (FI) terms of 5dimensional supersymmetric $U(1)$
gauge theory compactified on $S^1/Z_2$. In this model, loop diagrams including
matter hypermultiplets and brane chiral multiplets induce FIterms localized at
the fixed points. Localized FIterms lead instabilities of bulk modes. The form
of the induced FIterms strictly depends on wave function profiles of matter
multiplets. It is a nontrivial question whether the vacuum of 1loop corrected
potential is stable under radiative corrections. We investigate this issue and
it is found that the stable configuration is obtained when the bulk zero modes
shield the brane charge completely.

Dijet/$e^+e^$+ MET to Probe $Z_2$Odd Mediators to the Dark Sector. (arXiv:1906.08007v1 [hepph])
Authors: Florian Goertz, Karla TameNarvaez, Valentin Tenorth
We explore a scenario where Dark Matter (DM) couples to the Standard Model
mainly via a scalar mediator ${\cal S}$ that is odd under a $Z_2$ symmetry,
leading to interesting collider signatures. In fact, if linear interactions
with the mediator are absent the most important DM production mechanisms at
colliders could lead to final states with missing energy in association with at
least two fermions, such as dijet or dielectron signatures. The framework we
consider is modelindependent, in a sense that it is only based on symmetry and
formulated in the (extended) DM Effective Field Theory (eDMEFT) approach.
Moreover, it allows to address the smallness of firstgeneration fermion masses
via suppressed $Z_2$ breaking effects. From a dijet analysis at the LHC, we
find rather loose bounds on the effective ${\cal S}$${\cal S}$DMDM
interactions, unless the mediator couples very strongly to SM fermions, while a
future $e^+ e^$ collider, such as CLIC, could deliver tighter constraints on
the corresponding model parameters, given the mediator is leptophilic. We
finally highlight the parameter space that allows to produce the observed DM
density, including constraints from directdetection experiments.

New Physics in $b\to c \tau \nu$: Impact of Polarisation Observables and $B_c\to\tau\nu$. (arXiv:1906.08035v1 [hepph])
Authors: Marta Moscati
The experimental values of the leptonflavouruniversality tests ${\cal
R}(D)$ and ${\cal R}(D^*)$ show a tension of about $3.1\sigma$ with their
Standard Model prediction. Motivated by this tension, we perform a fit of the
$b\to c\tau\nu$ data. We consider oneparticle scenarios imposing consecutive
limits on $\text{BR}(B_c\to \tau\nu_\tau)$, and analyse how these limits affect
the fits. We include the polarisation observables available to date and predict
those that are still to be measured, and conclude that they have a high
modelresolving power. For each scenario we also predict ${\cal R}(\Lambda_c)$,
observing that an enhancement of ${\cal R}(D^{(*)})$ implies an enhancement of
${\cal R}(\Lambda_c)$ in any scenario. We trace back this enhancement to a
sumrule valid irrespective of the scenario used to fit ${\cal R}(D^{(*)})$.

Electroweak corrections to $e^+e^\to\gamma\gamma$ as a luminosity process at FCCee. (arXiv:1906.08056v1 [hepph])
Authors: Carlo M. Carloni Calame, Mauro Chiesa, Guido Montagna, Oreste Nicrosini, Fulvio Piccinini
We consider largeangle two photon production in $e^+ e^$ annihilation as a
possible process to monitor the luminosity of a future $e^+ e^$ circular
collider (FCCee). We review and assess the status of the theoretical accuracy
by performing a detailed phenomenological study of nexttoleading order
electroweak corrections and leading logarithmic QED contributions due to
multiple photon radiation. We also estimate the impact of photonic and
fermionloop corrections at nexttonexttoleading order and the uncertainty
induced by the hadronic contribution to the vacuum polarization. Possible
perspectives to address the target theoretical accuracy are briefly discussed.

Flux Tube Smatrix Bootstrap. (arXiv:1906.08098v1 [hepth])
Authors: Joan Elias Miro, Andrea L. Guerrieri, Aditya Hebbar, Joao Penedones, Pedro Vieira
We bootstrap the Smatrix of massless particles in unitary, relativistic two
dimensional quantum field theories. We find that the low energy expansion of
such Smatrices is strongly constrained by the existence of a UV completion. In
the context of flux tube physics, this allows us to constrain several terms in
the Smatrix low energy expansion or  equivalently  on Wilson coefficients
of several irrelevant operators showing up in the flux tube effective action.
These bounds have direct implications for other physical quantities; for
instance, they allow us to further bound the ground state energy as well as the
level splitting of degenerate energy levels of large flux tubes. We find that
the Smatrices living at the boundary of the allowed space exhibit an intricate
pattern of resonances with one sharper resonance whose quantum numbers, mass
and width are precisely those of the worldsheet axion proposed in [1,2]. The
general method proposed here should be extendable to massless Smatrices in
higher dimensions and should lead to new quantitative bounds on irrelevant
operators in theories of Goldstones and also in gauge and gravity theories.

Weakfield limit of KaluzaKlein model with nonlinear perfect fluid. (arXiv:1906.08214v1 [grqc])
Authors: Ezgi Yalçınkaya, Alexander Zhuk
In this paper, we investigate the sixdimensional KaluzaKlein model with
spherical compactification of the internal space. Background matter is
considered in the form of a perfect fluid with nonlinear equations of state
both in the external/our and internal spaces and the model is set to include an
additional bare cosmological constant $\Lambda_6$. In the weakfield
approximation, the background is perturbed by pressureless gravitating mass
that is a static pointlike particle. The demand that the parameterized
postNewtonian parameter $\gamma$ be equal to 1 in this configuration, first,
ensures compatibility with gravitational tests in the Solar system (deflection
of light and time delay of radar echoes) at the same level of accuracy as
General Relativity. Second, it translates into the absence of internal space
variations so that the gravitational potential coincides exactly with the
Newtonian one, securing the absence of the fifth force. Third, the gravitating
mass remains pressurless in the external space as in the standard approach to
nonrelativistic astrophysical objects and meanwhile, acquires effective
tension in the internal space.

Cosmic Conundra Explained by Thermal History and Primordial Black Holes. (arXiv:1906.08217v1 [astroph.CO])
Authors: Bernard Carr, Sebastien Clesse, Juan GarciaBellido, Florian Kuhnel
A universal mechanism may be responsible for several unresolved cosmic
conundra. The sudden drop in the pressure of relativistic matter at $W^{\pm} /
Z^{0}$ decoupling, the quarkhadron transition and $e^{+}e^{}$ annihilation
enhances the probability of primordial black hole (PBH) formation in the early
Universe. Assuming the amplitude of the primordial curvature fluctuations is
approximately scaleinvariant, this implies a multimodal PBH mass spectrum
with peaks at $10^{6}$, $1$, $30$, and $10^{6}\,M_{\odot}$. This suggests a
unified PBH scenario which naturally explains the dark matter and recent
microlensing observations, the LIGO/Virgo black hole mergers, the correlations
in the cosmic infrared and Xray backgrounds, and the origin of the
supermassive black holes in galactic nuclei at high redshift. A distinct
prediction of our model is that LIGO/Virgo should soon observe the merging of
black holes with masses between $2$ and $5\,M_{\odot}$ or above $70\,M_{\odot}$
and with low mass ratios.

New constraints on Lorentz Invariance violation from Crab Nebula spectrum beyond $100$ TeV. (arXiv:1906.08221v1 [astroph.HE])
Authors: Petr Satunin
Recently two collaborations, Tibet and HAWC, presented new measurements of
gammaray spectrum from Crab Nebula [arXiv:1906.05521, arXiv:1905.12518] which
continues beyond $100$ TeV. We use these data to establish twosided
constraints on parameters of Lorentz Invariance violation in quantum
electrodynamics. The new constraints are several times stronger than existing
in the literature.

Migdal Effect in Dark Matter Direct Detection Experiments. (arXiv:1707.07258v3 [hepph] UPDATED)
Authors: Masahiro Ibe, Wakutaka Nakano, Yutaro Shoji, Kazumine Suzuki
The elastic scattering of an atomic nucleus plays a central role in dark
matter direct detection experiments. In those experiments, it is usually
assumed that the atomic electrons around the nucleus of the target material
immediately follow the motion of the recoil nucleus. In reality, however, it
takes some time for the electrons to catch up, which results in ionization and
excitation of the atoms. In previous studies, those effects are taken into
account by using the socalled Migdal's approach, in which the final state
ionization/excitation are treated separately from the nuclear recoil. In this
paper, we reformulate the Migdal's approach so that the "atomic recoil" cross
section is obtained coherently, where we make transparent the energymomentum
conservation and the probability conservation. We show that the final state
ionization/excitation can enhance the detectability of rather light dark matter
in the GeV mass range via the {\it nuclear} scattering. We also discuss the
coherent neutrinonucleus scattering, where the same effects are expected.

Updated Constraints on NonStandard Interactions from Global Analysis of Oscillation Data. (arXiv:1805.04530v2 [hepph] UPDATED)
Authors: Ivan Esteban, M.C. GonzalezGarcia, Michele Maltoni, Ivan MartinezSoler, Jordi Salvado
We quantify our present knowledge of the size and flavor structure of
nonstandard neutrino interactions which affect the matter background in the
evolution of solar, atmospheric, reactor and longbaseline accelerator
neutrinos as determined by a global analysis of oscillation data  both alone
and in combination with the results on coherent neutrinonucleus scattering
from the COHERENT experiment. We consider general neutral current neutrino
interactions with quarks whose leptonflavor structure is independent of the
quark type. We study the dependence of the allowed ranges of nonstandard
interaction coefficients, the status of the LMAD solution, and the
determination of the oscillation parameters on the relative strength of the
nonstandard couplings to up and down quarks. Generically we find that the
conclusions are robust for a broad spectrum of uptodown strengths, and we
identify and quantify the exceptional cases related to couplings whose effect
in neutrino propagation in the Earth or in the Sun is severely suppressed. As a
result of the study we provide explicit constraints on the effective couplings
which parametrize the nonstandard Earth matter potential relevant for
longbaseline experiments.

Nucleon parton distributions from hadronic quantum fluctuations. (arXiv:1807.06589v3 [hepph] UPDATED)
Authors: Andreas Ekstedt, Hazhar Ghaderi, Gunnar Ingelman, Stefan Leupold
A physical model is presented for the nonperturbative parton distributions
in the nucleon. This is based on quantum fluctuations of the nucleon into
baryonmeson pairs convoluted with Gaussian momentum distributions of partons
in hadrons. The hadronic fluctuations, here developed in terms of hadronic
chiral perturbation theory, occur with high probability and generate sea quarks
as well as dynamical effects also for valence quarks and gluons. The resulting
parton momentum distributions $f(x,Q_0^2)$ at low momentum transfers are
evolved with conventional DGLAP equations from perturbative QCD to larger
scales. This provides parton density functions $f(x,Q^2)$ for the gluon and all
quark flavors with only five physicsmotivated parameters. By tuning these
parameters, experimental data on deep inelastic structure functions can be
reproduced and interpreted. The contribution to sea quarks from hadronic
fluctuations explains the observed asymmetry between $\bar{u}$ and $\bar{d}$ in
the proton. The strangequark sea is strongly suppressed at low $Q^2$, as
observed.

High Scale Boundary Conditions in Models with Two Higgs Doublets. (arXiv:1810.04518v3 [hepph] UPDATED)
Authors: John McDowall, David J Miller
We investigate high scale boundary conditions on the quartic Higgscouplings
and their $\beta$functions in the TypeII Two Higgs Doublet Model and the
Inert Doublet Model. These conditions are associated with two possible UV
physics scenarios: the Multiple Point Principle, in which the potential
exhibits a second minimum at $M_{Pl}$, and Asymptotic Safety, where the scalar
couplings run towards an interacting UV fixed point at high scales. We employ
renormalisation group running at twoloops and apply theoretical and
experimental constraints to their parameter spaces. We find neither model can
simultaneously accommodate the MPP whilst also providing realistic masses for
both the Higgs and the top quark. However, we do find regions of parameter
space compatible with Asymptotic Safety.

Fingerprinting the Top quark FCNC via anomalous $Ztq$ couplings at the LHeC. (arXiv:1811.04681v3 [hepph] UPDATED)
Authors: Subhasish Behera, Rashidul Islam, Mukesh Kumar, Poulose Poulose, Rafiqul Rahaman
A study of the top quark \emph{Flavour Changing Neutral Current} (FCNC)
through $Z$boson has been performed in the proposed future $e^p$ collider for
the energy, $E_{e(p)} = 60~(7000)$~GeV. We considered an effective theory where
the anomalous FCNC couplings are of vector and tensor nature. The effect of
these couplings is probed in the single top production along with the scattered
electron. The polar angle $\theta$ of the electrons coming out of the primary
vertex in association with the top quark polarization asymmetries constructed
from the angular distribution of the secondary lepton arising from the top
decay, allow to distinguish the Lorentz structure of the coupling. From a
multiparameter analysis, we obtain a reach of ${\cal O} (10^{2})$ in the case
of $Ztu$ and $Ztc$ couplings at an integrated luminosity of 2~ab$^{1}$ at 95\%
C.L.

Electroweak baryogenesis via bottom transport. (arXiv:1811.08088v3 [hepph] UPDATED)
Authors: Tanmoy Modak, Eibun Senaha
We consider a scenario in which an extra bottom Yukawa coupling can drive
electroweak baryogenesis in the general twoHiggs doublet model. It is found
that the new bottom Yukawa coupling with $\mathcal{O}(0.1)$ in magnitude can
generate the sufficient baryon asymmetry without conflicting existing data. We
point out that future measurements of the bottom Yukawa coupling at
HighLuminosity Large Hadron Collider and International Linear Collider,
together with the CP asymmetry of $B\to X_s\gamma$ at SuperKEKB provide
exquisite probes for this scenario.

Finite modular subgroups for fermion mass matrices and baryon/lepton number violation. (arXiv:1812.11072v3 [hepph] UPDATED)
Authors: Tatsuo Kobayashi, Yusuke Shimizu, Kenta Takagi, Morimitsu Tanimoto, Takuya H. Tatsuishi, Hikaru Uchida
We study a flavor model that the quark sector has the $S_3$ modular
symmetry,while the lepton sector has the $A_4$ modular symmetry. Our model
leads to characteristic quark mass matrices which are consistent with
experimental data of quark masses, mixing angles and the CP violating phase.
The lepton sector is also consistent with the experimental data of neutrino
oscillations. We also study baryon and lepton number violations in our flavor
model.

The Isoscalar Mesons and Exotic States in Light Front Holographic QCD. (arXiv:1901.11205v2 [hepph] UPDATED)
Authors: Liping Zou, Hans Günter Dosch, Guy F. de Téramond, Stanley J. Brodsky
In this article a systematic quantitative analysis of the isoscalar bosonic
states is performed in the framework of supersymmetric light front holographic
QCD. It is shown that the spectroscopy of the $\eta$ and $h$ mesons can be well
described if one additional mass parameter  which corresponds to the hard
breaking of chiral $U(1)$ symmetry in standard QCD  is introduced. The mass
difference of the $\eta$ and $\eta'$ isoscalar mesons is then determined by the
strange quark mass content of the $\eta'$. The theory also predicts the
existence of isoscalar tetraquarks which are bound states of diquarks and
antidiquarks. The candidates for these exotic isoscalar tetraquarks are
identified. In particular, the $f_0(1500)$ is identified as isoscalar
tetraquark; the predicted mass value 1.52 GeV agrees with the measured
experimental value within the model uncertainties.

MultiComponent Dark Matter in a NonAbelian Dark Sector. (arXiv:1902.04384v2 [hepph] UPDATED)
Authors: Fatemeh Elahi, Sara Khatibi
In this paper, we explore a dark sector scenario with a gauged $SU(2)_R$ and
a global $U(1)_X \times \mathbb{Z}_2$, where the continuous symmetries are
spontaneously broken to a global $U(1)_D$. We show that in various regions of
the parameter space we can have two, or three dark matter candidates, where
these dark matter particles are either a Dirac fermion, a dark gauge boson, or
a complex scalar. The phenomenological implications of this scenario are vast
and interesting. We identify the parameter space that is still viable after
taking into account the constraints from various experiments. We, also, discuss
how this scenario can explain the recent observation by DAMPE in the
electronpositron spectrum. Furthermore, we comment on the neutrino mass
generation through nonrenormalizable interactions between the standard model
and the dark sector.

Extending the constraint for axionlike particles as resonances at the LHC and laser beam experiments. (arXiv:1903.04151v4 [hepph] UPDATED)
Authors: C. Baldenegro, S. Hassani, C. Royon, L. Schoeffel
We study the discovery potential of axionlike particles (ALP),
pseudoscalars weakly coupled to Standard Model fields, at the Large Hadron
Collider (LHC). Our focus is on ALPs coupled to the electromagnetic field,
which would induce anomalous scattering of lightbylight. This can be directly
probed in central exclusive production of photon pairs in ultraperipheral
collisions at the LHC in proton and heavy ion collisions. We consider
nonstandard collision modes of the LHC, such as argonargon collisions at
$\sqrt{s_{NN}} = 7$ TeV and protonlead collisions at $\sqrt{s_{NN}} = 8.16$
TeV to access regions in the parameter space complementary to the ones
previously considered for leadlead or protonproton collisions. In addition,
we show that, using laser beam interactions, we can constrain ALPs as resonant
deviations in the refractive index, induced by anomalous lightbylight
scattering effects. If we combine the aforementioned approaches, ALPs can be
probed in a wide range of masses from the eV scale up to the TeV scale.

Fits to NonSupersymmetric SO(10) Models with Type I and II Seesaw Mechanisms Using Renormalization Group Evolution. (arXiv:1903.08241v2 [hepph] UPDATED)
Authors: Tommy Ohlsson, Marcus Pernow
We consider numerical fits to nonsupersymmetric $\mathrm{SO}(10)$based
models in which neutrino mass is generated by the typeI or typeII seesaw
mechanism or a combination of both. The fits are performed with a sophisticated
topdown procedure, taking into account the renormalization group equations of
the gauge and Yukawa couplings, integrating out relevant degrees of freedom at
their corresponding mass scales, and using recent data for the Standard Model
observables. We find acceptable fits for normal neutrino mass ordering only and
with neutrino mass generated by either typeI seesaw only or a combination of
types I and II seesaw in which typeI seesaw is dominant. Furthermore, we find
predictions from the best fit regarding the small neutrino masses, the
effective neutrinoless double beta decay mass, and the leptonic CPviolating
phase. Finally, we show that the fits are rather insensitive to the chosen
value of the unification scale.

QCD and electroweak corrections to WZ scattering at the LHC. (arXiv:1904.00882v3 [hepph] UPDATED)
Authors: Ansgar Denner, Stefan Dittmaier, Philipp Maierhöfer, Mathieu Pellen, Christopher Schwan
We present the first computation of the full nexttoleadingorder QCD and
electroweak corrections to the WZ scattering process at the LHC. All offshell,
gaugebosondecay, and interference effects are taken into account for the
process $\mathrm{p} \mathrm{p} \to \mu^+\mu^\mathrm{e}^+\nu_\mathrm{e}
\mathrm{j} \mathrm{j} + X$ at the orders $\mathcal{O}{\left( \alpha_\mathrm{s}
\alpha^6 \right)}$ and $\mathcal{O}{\left( \alpha^7 \right)}$. The electroweak
corrections feature the typical Sudakov behaviour towards high energy and
amount to $16\%$ relative to the electroweak contribution to the integrated
cross section. Moreover, the corrections induce significant shape distortions
in differential distributions. The nexttoleadingorder analysis of the quark
and gluoninduced channels is supplemented by a leadingorder study of all
possible contributions to the full $4\ell+2\mbox{jets}$ production cross
section in a realistic fiducial phasespace volume.

Pushing the Energy and Cosmic Frontiers with HighEnergy Astrophysical Neutrinos. (arXiv:1904.01595v3 [astroph.HE] UPDATED)
Authors: Mauricio Bustamante (Bohr Inst. & Copenhagen U.)
The astrophysical neutrinos recently discovered by the IceCube neutrino
telescope have the highest detected neutrino energies  from TeV to PeV 
and travel the longest distances  up to a few Gpc, the size of the
observable Universe. These features make them naturally attractive probes of
fundamental particlephysics properties, possibly tiny in size, at energy
scales unreachable by any other means. The decades before the IceCube discovery
saw many proposals of particlephysics studies in this direction. Today, those
proposals have become a reality, in spite of prevalent astrophysical unknowns.
We showcase examples of studying fundamental neutrino physics at these scales,
including some of the most stringent tests of physics beyond the Standard
Model.

Probing new physics in rare decays of bflavored Hadrons $b\to s \gamma$ in CMSSM/mSUGRA SUSY SO (10) theories. (arXiv:1904.12566v3 [hepph] UPDATED)
Authors: Gayatri Ghosh
The implications of the latest measurement of the branching fraction of B($
b\rightarrow s \gamma $) of b hadrons, which is another signature of New
Physics beyond Standard Model is presented here. The quark transitions $ b
\rightarrow s $, $ b \rightarrow d $ do not happen at tree level in the
Standard Model as the Z boson does not couple to quarks of different flavour.
In this work the present bounds on the quark transition $ b \rightarrow s $
within the constrained minimal supersymmetric extension of the Standard Model
(CMSSM), in which there are three independent soft SUSY breaking parameters $
m_{0} $, $ m_{1/2} $ and $ A_{0} $ is illustrated. The recent constraint on B($
b\rightarrow s \gamma $), B($ b_{s}\rightarrow \mu^{+}\mu^{}$), the recently
measured value of Higgs mass at LHC, $ M_{h} $, the value of $\theta_{13}$ from
reactor data and the Higgs branching ratios set very strong constraints on New
Physics models, in particular supersymmetry. A new epoch for this research has
begun since the Large Hadron Collider beauty (LHCb) experiment started
affording data for various observables for these decays. The results presented
here in mSUGRA/CMSSM models may gain access to supersymmetry even at scales
beyond the direct reach of the LHC and the susceptibleness to test these
theories at the next run of LHC is also explored.

Where Are We With Light Sterile Neutrinos?. (arXiv:1906.00045v2 [hepex] UPDATED)
Authors: A. Diaz, C.A. Argüelles, G.H. Collin, J.M. Conrad, M.H. Shaevitz
We review the status of searches for sterile neutrinos in the $\sim 1$ eV
range, with an emphasis on the latest results from short baseline oscillation
experiments and how they fit within sterile neutrino oscillation models. We
present global fit results to a threeactiveflavor plus onesterileflavor
model (3+1), where we find an improvement of $\Delta \chi^2=35$ for 3
additional parameters compared to a model with no sterile neutrino. This is a
5$\sigma$ improvement, indicating that an effect that is like that of a sterile
neutrino is highly preferred by the data. However we note that separate fits to
the appearance and disappearance oscillation data sets within a 3+1 model do
not show the expected overlapping allowed regions in parameter space. This
"tension" leads us to explore two options: 3+2, where a second additional mass
state is introduced, and a 3+1+decay model, where the $\nu_4$ state can decay
to invisible particles. The 3+1+decay model, which is also motivated by
improving compatibility with cosmological observations, yields the larger
improvement, with a $\Delta \chi^2=8$ for 1 additional parameter beyond the 3+1
model, which is a $2.6\sigma$ improvement. Moreover the tension between
appearance and disappearance experiments is reduced compared to 3+1, although
disagreement remains. In these studies, we use a frequentist approach and also
a Bayesean method of finding credible regions.
With respect to this tension, we review possible problems with the global
fitting method. We note multiple issues, including problems with reproducing
the experimental results, especially in the case of experiments that do not
provide adequate data releases. We discuss an unexpected 5 MeV excess, observed
in the reactor flux energy spectrum, that may be affecting the oscillation
interpretation of the short baseline reactor data. We emphasize the care that
must be taken in mapping to the true neutrino energy in the case of oscillation
experiments that are subject to multiple interaction modes and nuclear effects.
We point to problems with the "ParameterGoodnessofFit test" that is used to
quantify the tension. Lastly, we point out that analyses presenting limits
often receive less scrutiny that signals.
While we provide a snapshot of the status of sterile neutrino searches today
and global fits to their interpretation, we emphasize that this is a
fastmoving field. We briefly review experiments that are expected to report
new data in the immediate future. Lastly, we consider the 5year horizon, where
we propose that decayatrest neutrino sources are the best method of finally
resolving the confusing situation.

Super heavy thermal dark matter. (arXiv:1906.00981v2 [hepph] UPDATED)
Authors: Hyungjin Kim, Eric Kuflik
We propose a mechanism of elementary thermal dark matter with mass up to
$10^{14}$ GeV, within a standard cosmological history, whose relic abundance is
determined solely by its interactions with the Standard Model, without
violating the perturbative unitarity bound. The dark matter consists of many
nearly degenerate particles which scatter with the Standard Model bath in a
nearestneighbor chain, and maintain chemical equilibrium with the Standard
Model bath by inequilibrium decays and inverse decays. The phenomenology
includes super heavy elementary dark matter and heavy relics that decay at
various epochs in the cosmological history, with implications for CMB,
structure formation and cosmic ray experiments.

Triplet Leptogenesis, TypeII Seesaw Dominance, Intrinsic Dark Matter, Vacuum Stability and Proton Decay in Minimal SO(10) Breakings. (arXiv:1906.05601v2 [hepph] UPDATED)
Authors: Mainak Chakraborty, M.K. Parida, Biswonath Sahoo (SOA Deemed to be Univ.)
We implement typeII seesaw dominance for neutrino mass and baryogenesis
through heavy scalar triplet leptogenesis in a class of minimal
nonsupersymmetric SO(10) models where matter parity as stabilising discrete
symmetry as well as WIMP dark matter (DM) candidates are intrinsic predictions
of the GUT symmetry. We also find modifications of relevant CPasymmetry
formulas in such minimal models. Baryon asymmetry of the universe as solutions
of Boltzmann equations is further shown to be realized for both normal and
inverted mass orderings in concordance with cosmological bound and best fit
values of the neutrino oscillation data including $\theta_{23}$ in the second
octant and large values of leptonic Dirac CPphases. TypeII seesaw dominance
is at first successfully implemented in two cases of spontaneous SO(10)
breakings through SU(5) route where the presence of only one nonstandard Higgs
scalar of intermediate mass $\sim 10^910^{10}$ GeV achieves unification. Lower
values of the SU(5) unification scales $\sim 10^{15}$ GeV are predicted to
bring proton lifetimes to the accessible ranges of SuperKamiokande and
HyperKamiokande experiments. Our prediction of WIMP DM relic density in each
model is due to a $\sim$ TeV mass matterparity odd real scalar singlet
($\subset {16}_H \subset$ SO(10)) verifiable by LUX and XENON1T experiments.
This DM is also noted to resolve the vacuum stability issue of the standard
scalar potential. When applied to the unification framework of M. Frigerio and
T. Hambye, in addition to the minimal fermionic triplet DM solution of $2.7$
TeV mass, this procedure of typeII seesaw dominance and triplet leptogenesis
is also found to make an alternative prediction of triplet fermion plus real
scalar singlet DM at the TeV scale.

Improved description of the HERA data with a new simple PDF parametrization. (arXiv:1906.06573v3 [hepph] UPDATED)
Authors: Francesco Giuli, Marco Bonvini
A new parametrization for the parton distribution functions with a higher
flexibility in the small$x$ region is presented. It has been implemented in
the xFitter opensource PDF fitting tool, and compared to the default xFitter
parametrization, used for the determination of the HERAPDF set. It has been
found that the combined inclusive HERA I+II data can be described using NNLO
theory with a significantly higher quality than HERAPDF2.0: the $\chi^2$ is
reduced by more than 60 units, having used only four more parameters. Our
result highlights a significant parametrization bias in the default xFitter
parametrization at small $x$, which would lead to even more dramatic effects
when used for higher energy colliders, where the small$x$ region is more
relevant. We also find that the inclusion of small$x$ resummation leads to a
further reduction by approximately 30 extra units in $\chi^2$. In this
contribution, we review the results of the recent paper "A new simple PDF
parametrization: improved description of the HERA data" (arXiv:1902.11125).
