HEP Phenomenology·hep-ph

Fri·Jun 3, 2022Friday·June 3, 2022

23 papers—17 primary·6 cross-listed·reconstructed*

01*
Indications for a Nonzero Lepton Asymmetry from Extremely Metal-Poor Galaxies
Anne-Katherine Burns🇺🇸 · Tim M.P. Tait🇺🇸 · Mauro Valli🇺🇸
The recent measurement of helium-4 from the near-infrared spectroscopy of extremely metal-poor galaxies (EMPGs) by the Subaru Survey may point to a new puzzle in the Early Universe. We exploit this new helium measurement together with the percent-level determination of primordial deuterium, to assess indications for a non-vanishing lepton asymmetry during the Big Bang Nucleosynthesis (BBN) era, paying particular attention to the role of uncertainties in the nuclear reaction network. A cutting-edge Bayesian analysis focused on the role of the newly measured EMPGs, jointly with information from the Cosmic Microwave Background, suggests the existence of a nonzero lepton asymmetry at around the $2 σ$ level, providing a hint for cosmology beyond $Λ$ CDM. We discuss conditions for a large total lepton asymmetry to be consistently realized in the Early Universe.
hep-phastro-ph.COPRL(2023)·71 citations
02*
Neutrinoless double beta decay and Sterile dark matter in extended left right symmetric model
Bichitra Bijay Boruah🇮🇳 · Nayana Gautam🇮🇳 · Mrinal Kumar Das🇮🇳
We have studied a flavor symmetry-based extended left-right symmetric model(LRSM) with a dominant type-II seesaw mechanism and have explored the associated neutrino phenomenology. The particle content of the model includes usual quarks, and leptons along with additional sterile fermion per generation in the fermion sector while the scalar content contains Higgs doublets and scalar bidoublet. Realization of this extension of LRSM has been done by using $A_{4} \times Z_{4}$ discrete symmetries. In this work, we have also included the study of sterile neutrino dark matter(DM) phenomenology along with neutrinoless double beta decay within the framework.
hep-phJ.Phys.G(2024)·3 citations
03*
NPointFunctions: a calculator of amplitudes and observables in FlexibleSUSY
Uladzimir Khasianevich🇩🇪 · Wojciech Kotlarski🇩🇪 · Dominik Stöckinger🇩🇪
We present $NPointFunctions$ , a package to incorporate desired amplitudes and observables for an arbitrary BSM model in $FlexibleSUSY$ . The package relies on the $SARAH$ -generated output used with $FeynArts / FormCalc$ , embedded in an appropriate way, thus allowing calculations up to one-loop level. The resulting tool is an extension to $FlexibleSUSY$ , a generator of spectrum generator programs. $NPointFunctions$ was designed to be customizable, modular and extensible with additional process- or amplitude- dependent contributions. We explain, how these goals are achieved, and discuss modifications to the default $FlexibleSUSY$ workflow.
hep-phPoS(2022)·4 citations
04*
Topology-insensitive axion mass in magnetic topological insulators
Koji Ishiwata🇯🇵
We study the axion in three-dimensional topological insulators with magnetic impurities under finite temperature. We find a stable antiferromagnetic ground state and ferromagnetic metastable state. In both magnetic states, the mass of the axion is found to be up to eV scale and it approaches zero near the phase boundary of the magnetic state. This result applies to both normal and topological insulator phases, i.e., the axion mass is insensitive to the topological states, and it will have a direct impact on the targeted mass range of particle axion dark matter in future experiments.
hep-phcond-mat.mes-hallcond-mat.str-elPRB(2022)·3 citations
05*
Phenomenological implications on a hidden sector from the Festina Lente bound
Kayoung Ban🇰🇷 · Dhong Yeon Cheong🇰🇷 · Hiroshi Okada🇰🇷 · Hajime Otsuka🇯🇵 · Jong-Chul Park🇰🇷 · Seong Chan Park🇰🇷
We apply the Festina Lente (FL) bound on a hidden sector with $U (1)$ gauge symmetries. Since the FL bound puts a lower bound on masses of particles charged under the $U (1)$ gauge symmetries, it is possible to constrain the hidden sector even with a tiny coupling to the Standard Model. In particular, we focus on the phenomenological implications of the FL bound on milli-charged particles, which naturally arise when kinetic mixing between the photon and the hidden photon is allowed. It turns out that the milli-charged particle with the mass $M ≲ 5$ meV is prohibited by the FL bound in the case of a single hidden $U (1)$ , independent of the value of kinetic mixing. This bound is crucial when bosonic dark matter is taken in consideration in this framework: the fuzzy bosonic dark matter models requesting minuscule masses are ruled out by the FL bound if the longevity of dark matter is protected by the hidden gauge symmetry.
hep-phhep-thPTEP(2023)·14 citations
06*
The dynamical holographic QCD method for hadron physics and QCD matter
Yidian Chen🇨🇳 · Danning Li🇨🇳 · Mei Huang🇨🇳
In this paper we present a short overview on the dynamical holographic QCD method for hadron physics and QCD matter. The 5-dimensional dynamical holographic QCD model is constructed in the graviton-dilaton-scalar framework with the dilaton background field $Φ$ and the scalar field $X$ dual to the gluon condensate and the chiral condensate operator thus can represent the gluodynamics (linear confinement) and chiral dynamics (chiral symmetry breaking), respectively. The dilaton background field and the scalar field are a function of the 5th dimension, which plays the role of the energy scale, in this way, the DhQCD model can resemble the renormalization group from ultraviolet (UV) to infrared (IR). By solving the Einstein equation, the metric structure at IR is automatically deformed by the nonperturbative gluon condensation and chiral condensation in the vacuum. We review the results on the hadron spectra including the glueball spectra, the light/heavy meson spectra, as well as on QCD phase transitions, and thermodynamical as well as transport properties in the framework of the dynamical holographic QCD model.
hep-phCommun.Theor.Phys.(2022)·40 citations
07*
AAfrag 2.01: Interpolation routines for Monte Carlo results on secondary production including light antinuclei in hadronic interactions
M. Kachelriess🇳🇴 · S. Ostapchenko🇩🇪 · J. Tjemsland🇳🇴
Light antinuclei, like antideuteron and antihelium-3, are ideal probes for new, exotic physics because their astrophysical backgrounds are suppressed at low energies. In order to exploit fully the inherent discovery potential of light antinuclei, a reliable description of their production cross sections in cosmic ray interactions is crucial. We provide therefore the cross sections of antideuteron and antihelium-3 production in $pp$ , $p$ He, He $p$ , HeHe, $p ˉ p$ and $p ˉ$ He collisions at energies relevant for secondary production in the Milky Way, in a tabulated form which is convinient to use. These predictions are based on QGSJET-II-04m and the state of the art coalescence model WiFunC, which evaluates the coalesence probability on an event-by-event basis, including both momentum correlations and the dependence on the emission volume. In addition, we comment on the importance of a Monte Carlo description of the antideuteron production and on the use of event generators in general. In particular, we discuss the effect of two-particle momentum correlations provided by Monte Carlo event generators on antinuclei production.
hep-phComput.Phys.Commun.(2023)·21 citations
08*
Unflavored Leptogenesis and Neutrino Masses in Flavored SUSY SU(5) model
M. A. Loualidi🇲🇦 · M. Miskaoui🇲🇦
We propose a model with $D_{4}$ flavor symmetry for leptogenesis in the framework of supersymmetric $S U (5)$ grand unified theory. Neutrino masses arise from the type I seesaw mechanism where the spontaneous symmetry breaking of the flavor symmetry leads to the well-known trimaximal mixing ( $T M_{2}$ ). We find that this model predicts the normal hierarchy (NH) for neutrino masses. We also find that the predicted range of the effective neutrino mass $m_{β β}$ can be tested at future neutrinoless double beta decay experiments. For the generation of the baryon asymmetry of the Universe (BAU), we consider the unflavored leptogenesis regime and we take into account the decay of the three righ-handed neutrinos $N_{i}$ . We conclude that the BAU originates from a correction to the Dirac operator giving rise to a new coupling and a $C P$ phase which both play an important role in generating the observed BAU.
hep-ph2 citations
09*
Determination of Collins-Soper kernel from cross-sections ratios
Armando Bermudez Martinez🇩🇪 · Alexey Vladimirov🇪🇸
We present a novel method of extraction of the Collins-Soper kernel directly from the comparison of differential cross-sections measured at different energies. Using this method, we analyze the pseudo-data generated by the CASCADE event generator and extract the Collins-Soper kernel predicted by the parton-branching model in the wide range of transverse distances. The procedure can be applied, with minor modifications, to the real measured data for Drell-Yan and SIDIS processes.
hep-phPRD(2022)·25 citations
10*
Resummation and cancellation of the VIA source in electroweak baryogenesis
Marieke Postma🇳🇱 · Jorinde van de Vis🇩🇪 · Graham White🇯🇵
We re-derive the vev-insertion approximation (VIA) source in electroweak baryogenesis. In contrast to the original derivation, we rely solely on 1-particle-irreducible self-energy diagrams. We solve the Green's function equations both perturbatively and resummed over all vev-insertions. The VIA source corresponds to the leading order contribution in the gradient expansion of the Kadanoff-Baym (KB) equations. We find that it vanishes both for bosons and fermions, both in the perturbative and in the resummed approach. Interestingly, the non-existence of the source is a result of a cancellation between different terms in the KB equations, and not of a pathology in the vev-insertion approximation itself.
hep-phastro-ph.COJHEP(2022)·28 citations
11*
Axion dark matter from frictional misalignment
Alexandros Papageorgiou🇰🇷 · Pablo Quílez🇩🇪 · Kai Schmitz🇨🇭
We study the impact of sphaleron-induced thermal friction on the axion dark-matter abundance due to the interaction of an axion-like particle (ALP) with a dark non-abelian gauge sector in a secluded thermal bath. Thermal friction can either enhance the axion relic density by delaying the onset of oscillations or suppress it by damping them. We derive an analytical formula for the \emph{frictional adiabatic invariant}, which remains constant along the axion evolution and which allows us to compute the axion relic density in a general set-up. Even in the most minimal scenario, in which a single gauge group is responsible for both the generation of the ALP mass and the friction force, we find that the resulting dark-matter abundance from the misalignment mechanism deviates from the standard scenario for axion masses $m_{a} ≳ 100 eV$ . We also generalize our analysis to the case where the gauge field that induces friction and the gauge sector responsible for the ALP mass are distinct and their couplings to the axion have a large hierarchy as can be justified by means of alignment or clockwork scenarios. We find that it is easy to open up the ALP parameter space where the resulting axion abundance matches the observed dark-matter relic density both in the traditionally over- and underabundant regimes. This conclusion also holds for the QCD axion.
hep-phJHEP(2023)·29 citations
12*
Speed of sound in cosmological phase transitions and effect on gravitational waves
Tuomas V. I. Tenkanen🇸🇪 · Jorinde van de Vis🇩🇪
The energy budget for gravitational waves of a cosmological first order phase transitions depends on the speed of sound in the thermal plasma in both phases around the bubble wall. Working in the real-singlet augmented Standard Model, which admits a strong two-step electroweak phase transition, we compute higher order corrections to the pressure and sound speed. We compare our result to lower-order approximations to the sound speed and the energy budget and investigate the impact on the gravitational wave signal. We find that deviations in the speed of sound from $c_{s}^{2} = 1/3$ are enhanced up to $O (5%)$ in our higher-order computation. This results in a suppression in the energy budget of up to $O (50%)$ compared to approximations assuming $c_{s}^{2} = 1/3$ . The effect is most significant for hybrid and detonation solutions. We generalise our discussion to the case of multiple inert scalars and the case of a reduced number of fermion families in order to mimic hypothetical dark sector phase transitions. In this sector with modified field content, the sound speed can receive significant suppression, with potential order-of-magnitude impact on the gravitational wave amplitude.
hep-phastro-ph.COJHEP(2022)·49 citations
13*
Probes of Heavy Sterile Neutrinos
Patrick D. Bolton🇮🇹 · Frank F. Deppisch🇬🇧 · P.S. Bhupal Dev🇺🇸
We review probes of heavy sterile neutrinos, focusing on direct experimental searches and neutrinoless double beta decay. Working in a phenomenological parametrization, we emphasize the importance of the nature of sterile neutrinos in interpreting neutrinoless double beta decay searches. While current constraints on the active-sterile neutrino mixing are already stringent, we highlight planned future efforts that will probe regimes motivated by the lightness of active neutrinos.
hep-ph18 citations
14*
The energy budget of cosmological first-order phase transitions beyond the bag equation of state
Shao-Jiang Wang🇨🇳 · Zi-Yan Yuwen🇨🇳
The stochastic gravitational-wave backgrounds (SGWBs) from the cosmological first-order phase transitions (FOPTs) serve as a promising probe for the new physics beyond the standard model of particle physics. When most of the bubble walls collide with each other long after they had reached the terminal wall velocity, the dominated contribution to the SGWBs comes from the sound waves characterized by the efficiency factor of inserting the released vacuum energy into the bulk fluid motions. However, the previous works of estimating this efficiency factor have only considered the simplified case of the constant sound velocities in both symmetric and broken phases, either for the bag model with equal sound velocities or $ν$ -model with different sound velocities in the symmetric and broken phases, which is unrealistic from a viewpoint of particle physics. In this paper, we propose to solve the fluid EoM with an iteration method when taking into account the sound-velocity variation across the bubble wall for a general and realistic equation of state (EoS) beyond the simple bag model and $ν$ -model. We have found a suppression effect for the efficiency factor of bulk fluid motions, though such a suppression effect could be negligible for the strong FOPT, in which case the previous estimation from a bag EoS on the efficiency factor of bulk fluid motions still works as a good approximation.
hep-phastro-ph.COgr-qcJCAP(2022)·28 citations
15*
A note on the possible bound $D^{(*)} D^{(*)}, B ˉ^{(*)} B ˉ^{(*)}$ and $D^{(*)} B ˉ^{(*)}$ states
Luciano M. Abreu🇧🇷
Motivated by the recently observation of the tetraquark $T_{cc}^{+}$ state, in this work I revisit the Heavy-Meson Effective Theory to perform a simplified field-theoretical study of possible deuteron-like $D^{(*)} D^{(*)}, B ˉ^{(*)} B ˉ^{(*)}$ and $D^{(*)} B ˉ^{(*)}$ molecules. In particular, using the data from $T_{cc}^{+}$ as input to fix the potential associated to the shallow-bound $D D^{*}$ system with $I (J^{P}) = 1 (1^{+})$ , the conditions for the formation of other loosely-bound states in the doubly charmed sector are analyzed. The other sectors are also discussed.
hep-phNPB(2022)·27 citations
16*
Multiboson signals in the UN2HDM
J. A. Aguilar-Saavedra🇪🇸 · F. R. Joaquim🇵🇹 · J. F. Seabra🇪🇸
We address multiboson production from a heavy $Z^{'}$ resonance in the context of the UN2HDM, a standard model extension with an additional $U (1)^{'}$ symmetry and an enlarged scalar sector with an extra doublet and a singlet. After taking into account theoretical and experimental constraints on the model, it turns out this type of signals - mostly uncovered by current searches - could be sizeable. We focus on three benchmark scenarios, each of them predicting up to 4000 multiboson events with the LHC Run 2 collected luminosity. Anomaly-detection methods could uncover those signals, if present in data.
hep-phhep-exEPJC(2022)·3 citations
17*
Semi-dark Higgs decays: sweeping the Higgs neutrino floor
J. A. Aguilar-Saavedra🇪🇸 · J. M. Cano🇪🇸 · J. M. No🇪🇸 · D. G. Cerdeño🇪🇸
We study exotic Higgs decays $h \to Z X$ , with $X$ an invisible beyond the Standard Model (SM) particle, resulting in a semi-dark final state. Such exotic Higgs decays may occur in theories of axion-like-particles (ALPs), dark photons or pseudoscalar mediators between the SM and dark matter. The SM process $h \to Z ν ν ˉ$ represents an irreducible "neutrino floor" background to these new physics searches, providing also a target experimental sensitivity for them. We analyze $h \to Z + invisible$ searches at the LHC and a future ILC, showing that these exotic Higgs decays can yield sensitivity to unexplored regions of parameter space for ALPs and dark matter models.
hep-phhep-exPRD(2022)·7 citations
18*
Lattice QCD calculation of light sterile neutrino contribution in $0 ν 2 β$ decay
Xin-Yu Tuo🇨🇳 · Xu Feng🇨🇳 · Lu-Chang Jin🇺🇸
We present a lattice QCD study of the neutrinoless double beta decay involving light sterile neutrinos. The calculation is performed at physical pion mass using five gauge ensembles generated with the $2 + 1$ -flavor domain wall fermions. We obtain the low-energy constants $g_{LR}^{π π} (m_{ν})$ with the neutrino mass $m_{ν}$ from $0$ GeV to $3$ GeV. The lattice results are reasonably consistent with the previous interpolation method with a $\sim 20%$ deviation at small $m_{ν}$ . We provide an explanation on the discrepancy at vanishing neutrino mass. At large $m_{ν}$ , a good consistence between our results and the previous lattice determination of $g_{4}^{π π} (μ)$ is found at $μ = m_{ν} = 3$ GeV.
↳ hep-lathep-phPRD(2022)·17 citations
19*
Renormalizable Extension of the Abelian Higgs-Kibble Model with a dimension 6 operator
D.Binosi (ECT, Trento)🇮🇹 · A.Quadri (INFN, Milano)🇮🇹
A deformation of the Abelian Higgs Kibble model induced by a dimension 6 derivative operator is studied. A novel differential equation is established fixing the dependence of the vertex functional on the coupling $z$ of the dim.6 operator in terms of amplitudes at $z = 0$ (those of the power-counting renormalizable Higgs-Kibble model). The latter equation holds in a formalism where the physical mode is described by a gauge-invariant field. The functional identities of the theory in this formalism are studied. In particular we show that the Slavnov-Taylor identities separately hold true at each order in the number of internal propagators of the gauge-invariant scalar. Despite being non-power-counting renormalizable, the model at $z \neq = 0$ depends on a finite number of physical parameters.
↳ hep-thhep-phPRD(2022)·6 citations
20*
The solar disk at high energies
Miguel Gutiérrez🇪🇸 · Manuel Masip🇪🇸 · Sergio Muñoz🇪🇸
High energy cosmic rays "illuminate" the Sun and produce an image that could be observed in up to five different channels: a cosmic ray shadow (whose energy dependence has been studied by HAWC); a gamma ray flux (observed at $E \leq 200$ GeV by Fermi-LAT); a muon shadow (detected by ANTARES and IceCube); a neutron flux (undetected, as there are no hadronic calorimeters in space); and a flux of high energy neutrinos. Since these signals are correlated, the ones already observed can be used to reduce the uncertainty in the still undetected ones. Here we define a simple set up that uses the Fermi-LAT and HAWC observations to imply very definite fluxes of neutrons and neutrinos from the solar disk. In particular, we provide a fit of the neutrino flux at 10 GeV-10 TeV that includes its dependence on the zenith angle and on the period of the solar cycle. This flux represents a neutrino floor in indirect dark matter searches. We show that in some benchmark models the current bounds on the dark matter-nucleon cross section push the solar signal below this neutrino floor.
↳ astro-ph.HEhep-phApJ(2022)·12 citations
21*
Equilibration and locality
Marek Gazdzicki🇵🇱 · Mark Gorenstein🇺🇦 · Ivan Pidhurskyi🇩🇪 · Oleh Savchuk🇺🇦 · Leonardo Tinti🇵🇱
Experiments motivated by predictions of quantum mechanics indicate non-trivial correlations between spacelike-separated measurements. The phenomenon is referred to as a violation of strong-locality and, after Einstein, called ghostly action at a distance. An intriguing and previously unasked question is how the evolution of an assembly of particles to equilibrium-state relates to strong-locality. More specifically, whether, with this respect, indistinguishable particles differ from distinguishable ones. To address the question, we introduce a Markov-chain based framework over a finite set of microstates. For the first time, we formulate conditions needed to obey the particle transport- and strong-locality for indistinguishable particles. Models which obey transport-locality and lead to equilibrium-state are considered. We show that it is possible to construct models obeying and violating strong-locality both for indistinguishable particles and for distinguishable ones. However, we find that only for distinguishable particles strongly-local evolution to equilibrium is possible without breaking the microstate-symmetry. This is the strongest symmetry one can impose and leads to the shortest equilibration time. We hope that the results presented here may provide a new perspective on a violation of strong-locality, and the developed framework will help in future studies. Specifically they may help to interpret results on high-energy nuclear collisions indicating a fast equilibration of indistinguishable particles.
↳ nucl-thhep-phquant-phActa Phys.Polon.B(2022)·1 citation
22*
The European Spallation Source neutrino Super Beam Conceptual Design Report
A. Alekou · E. Baussan · A.K. Bhattacharyya · N. Blaskovic Kraljevic · M. Blennow · M. Bogomilov · B. Bolling · E. Bouquerel · O. Buchan · A. Burgman · C.J. Carlile · J. Cederkall and 64 other authors
This conceptual design report provides a detailed account of the European Spallation Source neutrino Super Beam (ESS $ν$ SB) feasibility study. This facility has been proposed after the measurements reported in 2012 of a relatively large value of the neutrino mixing angle $θ_{13}$ , which raised the possibility of observing potential CP violation in the leptonic sector with conventional neutrino beams. The measured value of $θ_{13}$ also privileges the $2^{n d}$ oscillation maximum for the discovery of CP violation instead of the more typically studied $1^{s t}$ maximum. The sensitivity at this $2^{n d}$ oscillation maximum is about three times higher than at the $1^{s t}$ one, which implies a reduced influence of systematic errors. Working at the $2^{n d}$ oscillation maximum requires a very intense neutrino beam with an appropriate energy. The world's most intense pulsed spallation neutron source, the European Spallation Source (ESS), will have a proton linac operating at 5\,MW power, 2\,GeV kinetic energy and 14~Hz repetition rate (3~ms pulse duration, 4\% duty cycle) for neutron production. In this design study it is proposed to double the repetition rate and compress the beam pulses to the level of microseconds in order to provide an additional 5~MW proton beam for neutrino production. The physics performance has been evaluated for such a neutrino super beam, in conjunction with a megaton-scale underground water Cherenkov neutrino detector installed at a distance of 360--550\,km from ESS. The ESS proton linac upgrades, the accumulator ring required for proton-pulse compression, the target station design and optimisation, the near and far detector complexes, and the physics potential of the facility are all described in this report. The ESS linac will be operational by 2025, at which point the implementation of upgrades for the neutrino facility could begin.
↳ hep-exhep-phphysics.acc-phEur.Phys.J.ST(2022)·79 citations
23*
Sharp Signals of Boson Clouds in Black Hole Binary Inspirals
Daniel Baumann🇳🇱 · Gianfranco Bertone🇳🇱 · John Stout🇺🇸 · Giovanni Maria Tomaselli🇳🇱
Gravitational waves (GWs) are an exciting new probe of physics beyond the standard models of gravity and particle physics. One interesting possibility is provided by the so-called "gravitational atom," wherein a superradiant instability spontaneously forms a cloud of ultralight bosons around a rotating black hole. The presence of these boson clouds affects the dynamics of black hole binary inspirals and their associated GW signals. In this Letter, we show that the binary companion can induce transitions between bound and unbound states of the cloud, effectively "ionizing" it, analogous to the photoelectric effect in atomic physics. The orbital energy lost in this process can overwhelm the losses due to GW emission, so that ionization drives the inspiral rather than merely perturbing it. We show that the ionization power contains sharp features that lead to distinctive "kinks" in the evolution of the emitted GW frequency. These discontinuities are a unique signature of the boson cloud and observing them would not only constitute a detection of the ultralight boson itself, but also provide direct information about its mass and the state of the cloud.
↳ gr-qchep-phhep-thPRL(2022)·117 citations

* Reconstructed cohort: no mailing for this day survives in the archive. Papers are grouped by their submission times and arXiv's announcement cut-off, assuming announcement without delay; positions follow identifier order. Validated at ~91% exact-day agreement against the archived era.