Fri·Apr 29, 2022Friday·April 29, 2022

1. 01*

   Prospects for a flavour violating $Z^{\prime }$ explanation of $\Delta a_{\mu ,e}$

   J. Kriewald🇫🇷 · J. Orloff🇫🇷 · E. Pinsard🇫🇷 · A. M. Teixeira🇫🇷

   The apparent tensions emerging from the comparison of experimental data of the anomalous magnetic moments of the muon and electron to the Standard Model predictions ($\Delta a_{\mu ,e}$) could be interpreted as a potential signal of New Physics. Models encompassing a light vector boson have been known to offer a satisfactory explanation to $\Delta a_{\mu }$, albeit subject to stringent experimental constraints. Here we explore a minimal extension of the Standard Model via a leptophilic vector boson $Z^{\prime }$, under the hypothesis of strictly flavour-violating couplings of the latter to leptons. The most constraining observables to this ad-hoc construction emerge from lepton flavour universality violation (in $Z$ and $\tau$ decays) and from rare charged lepton flavour violating transitions. Once these are accommodated, one can saturate the tensions in $\Delta a_{\mu }$, but $\Delta a_e$ is predicted to be Standard Model-like. We infer prospects for several observables, including leptonic $Z$ decays and several charged lepton flavour violating processes. We also discuss potential signatures of the considered $Z^{\prime }$ at a future muon collider, emphasising the role of the ${\mu }^{+}{\mu }^{-}\to {\tau }^{+}{\tau }^{-}$ forward-backward asymmetry as a key probe of the model.

   hep-phEPJC(2022)·18 citations
2. 02*

   Timing and Multi-Channel: Novel Method for Determining the Neutrino Mass Ordering from Supernovae

   Vedran Brdar🇺🇸 · Xun-Jie Xu🇨🇳

   One of the few remaining unknowns in the standard three-flavor neutrino oscillation paradigm is the ordering of neutrino masses. In this work we propose a novel method for determining neutrino mass ordering using the time information on early supernova neutrino events. In a core-collapse supernova, neutrinos are produced earlier than antineutrinos and, depending on the mass ordering which affects the adiabatic flavor evolution, may cause earlier observable signals in ${\nu }_e$ detection channels than in others. Hence, the time differences are sensitive to the mass ordering. We find that using the time information on the detection of the first galactic supernova events at future detectors like DUNE, JUNO and Hyper-Kamiokande, the mass ordering can already be determined at $\sim 2\sigma$ CL, while $\mathcal{O}(10)$ events suffice for the discovery. Our method does not require high statistics and could be used within the supernova early warning system (SNEWS) which will have access to the time information on early supernova neutrino events recorded in a number of detectors. The method proposed in this paper also implies a crucial interplay between the mass ordering and the triangulation method for locating supernovae.

   hep-phastro-ph.HEhep-exJCAP(2022)·17 citations
3. 03*

   Investigating Top-Higgs FCNC Couplings at the FCC-hh

   O. M. Ozsimsek🇹🇷 · V. Ari🇹🇷 · O. Cakir🇹🇷

   We have studied the sensitivity to flavor changing neutral current interaction of top and Higgs boson at the future circular collider in the hadron-hadron collision mode (FCC-hh). Our main concerns are the processes of $pp\to th$ (FCNC production) and $pp\to t\bar{t}$ (one top FCNC decay) which contributes to the single lepton, at least three jets and the missing energy transverse in the final state. On the one hand FCC-hh offers very high luminosity and large cross section for these signal processes, on the other hand signal can be distinguished from background which needs application of ingenious methods. Here, we have inspired and followed the searches at the LHC using our analysis path and enhanced attainable limits obtained on the possible top-Higgs FCNC couplings phenomenologically. We obtain new limits which are beyond the current experimental limits obtained from different channels and processes at the LHC. The potential discovery or exclusion limits on branching ratios for $tqH$ FCNC interactions can be set $BR({\eta }_{uc}{)}_{\mathrm{disc}}=9.08\times 10^{-6}$ or $BR({\eta }_{uc}{)}_{\mathrm{exc}}=2.78\times 10^{-6}$ at an integrated luminosity of 30 ab${}^{-1}$ , respectively. Our results are compatible with the other channels already studied at FCC-hh.

   hep-phNPB(2022)·3 citations
4. 04*

   Electroweak Corrections to Dark Matter Direct Detection in the Dark Singlet Phase of the N2HDM

   Seraina Glaus🇩🇪 · Margarete Mühlleitner🇩🇪 · Jonas Müller🇩🇪 · Shruti Patel🇩🇪 · Rui Santos🇵🇹

   Direct detection experiments are the only way to obtain indisputable evidence of the existence of dark matter (DM) in the form of a particle. These experiments have been used to probe many extensions of the Standard Model (SM) that provide DM candidates. Experimental results like the latest ones from XENON1T lead to severe constraints in the parameter space of many of the proposed models. In a simple extension of the SM, the addition of a complex singlet to the SM content, one-loop corrections need to be taken into account because the tree-level cross section is proportional to the DM velocity, and therefore negligible. In this work we study the case of a DM particle with origin in a singlet but in a larger framework of an extension by an extra doublet together with the extra singlet providing the DM candidate. We show that in the region of interest of the present and future direct detection experiments, electroweak corrections are quite stable with a $K$-factor very close to one.

   hep-phPLB(2022)·7 citations
5. 05*

   Compatibility of Neutrino DIS Data and Its Impact on Nuclear Parton Distribution Functions

   K.F.Muzakka🇩🇪 · P.Duwentäster🇩🇪 · T.J.Hobbs🇺🇸 · T.Ježo🇩🇪 · M.Klasen🇩🇪 · K.Kovařík🇩🇪 · A.Kusina🇵🇱 · J.G.Morfín🇺🇸 · F.I.Olness🇺🇸 · R.Ruiz🇵🇱 · I.Schienbein🇫🇷 · J.Y.Yu🇫🇷

   In global analyses of nuclear parton distribution functions (nPDFs), neutrino deep-inelastic scattering (DIS) data have been argued to exhibit tensions with the data from charged-lepton DIS. Using the nCTEQ framework, we investigate these possible tensions both internally and with the data sets used in our recent nPDF analysis nCTEQ15WZSIH. We take into account nuclear effects in the calculation of the deuteron structure function $F_2^D$ using the CJ15 analysis. The resulting nPDF fit, nCTEQ15WZSIHdeut, serves as the basis for our comparison with inclusive neutrino DIS and charm dimuon production data. Using ${\chi }^2$ hypothesis testing, we confirm evidence of tensions with these data and study the impact of the proton PDF baseline as well as the treatment of data correlation and normalization uncertainties. We identify the experimental data and kinematic regions that generate the tensions and present several possible approaches how a consistent global analysis with neutrino data can be performed. We show that the tension can be relieved using a kinematic cut at low $x$ ($x>0.1$) and also investigate a possibility of managing the tensions by using uncorrelated systematic errors. Finally, we present a different approach identifying a subset of neutrino data which leads to a consistent global analysis without any additional cuts. Understanding these tensions between the neutrino and charged-lepton DIS data is important not only for a better flavor separation in global analyses of nuclear and proton PDFs, but also for neutrino physics and for searches for physics beyond the Standard Model.

   hep-phhep-exnucl-thPRD(2022)·41 citations
6. 06*

   FIMP Dark Matter in Heterotic M-Theory

   Sebastian Dumitru🇺🇸 · Burt A. Ovrut🇺🇸

   Within the context of $N=1$ supersymmetric heterotic $M$-theory, we present a "freeze-in" mechanism for producing dark matter via a "moduli portal" between the observable and hidden sectors. It is assumed that the observable sector consists of the MSSM or some physically acceptable extension of it, while the hidden sector is chosen so as to satisfy all physical and mathematical constraints. Dark matter production processes are examined for two fundamental types of hidden sectors; those whose gauge bundle structure group contains an anomalous $U(1)$ and those whose structure group is non-Abelian and anomaly free. The couplings of the dilaton and the "universal" modulus to all fields of the observable and hidden sectors are presented and analyzed. These interactions are then combined to produce a moduli portal from a thermal bath of observable sector particles to the hidden sector. These processes are then analyzed for both the anomalous and non-anomalous cases. It is shown that only the uncharged hidden sector matter scalars can play the role of dark matter, and that these are predominantly produced during the "reheating" epoch on the observable sector. Within the context of both an anomalous and non-anomalous hidden sector, we calculated the dark matter "relic density". We show that in both case, for a wide choice of moduli vacua, one can correctly predict the observabled relic density. For the anomalous $U(1)$ case, we choose a specific physically acceptable vacuum within the context of the $B-L$ MSSM and show that one precisely obtains the measured dark matter relic abundance.

   hep-phhep-thJHEP(2022)·3 citations
7. 07*

   Structure of Axion Miniclusters

   David Ellis🇩🇪 · David J. E. Marsh🇬🇧 · Benedikt Eggemeier🇩🇪 · Jens Niemeyer🇩🇪 · Javier Redondo🇪🇸 · Klaus Dolag🇩🇪

   The Peak-Patch algorithm is used to identify the densest minicluster seeds in the initial axion density field simulated from string decay. The fate of these dense seeds is found by tracking the subsequent gravitational collapse in cosmological $N$-body simulations. We find that miniclusters at late times are well described by NFW profiles, although for around 80\% of simulated miniclusters a single power-law density profile of $r^{-2.9}$ is an equally good fit due to the unresolved scale radius. Under the assumption that all miniclusters with an unresolved scale radius are described by a power-law plus axion star density profile, we identify a significant number of miniclusters that might be dense enough to give rise to gravitational microlensing if the axion mass is $0.2\mathrm{meV}\lesssim m_a\lesssim 3\mathrm{meV}$. Higher resolution simulations resolving the inner structure and axion star formation are necessary to explore this possibility further.

   hep-phastro-ph.COPRD(2022)·58 citations
8. 08*

   Dark $SU(2{)}_D$ Gauge Symmetry and Scotogenic Dirac Neutrinos

   Debasish Borah🇮🇳 · Ernest Ma🇺🇸 · Dibyendu Nanda🇰🇷

   Dark matter is postulated to transform under the non-Abelian $SU(2{)}_D$ gauge symmetry. Its connection to Dirac neutrino masses is explored.

   hep-phPLB(2022)·12 citations
9. 09*

   Stimulated perturbation on the neutron flux distribution in the mutually-dependent source-to-absorber geometry

   Ateia W. Mahmoud🇪🇬 · Elsayed K. Elmaghraby🇪🇬 · A. H. M. Solieman🇪🇬 · E. Salama🇪🇬 · A. Elghazaly🇪🇬 · S. A. El-fiki🇪🇬

   The complexity of the neutron transport phenomenon throws its shadows on every physical system wherever neutron is produced or absorbed. The Monte Carlo N-Particle Transport Code (MCNP) was used to investigate the flux perturbations in the neutron field caused by an absorber. The geometry of the present experiment was designed to reach a simulation of an isotopic neutron field. The neutron source was a ${}^{241}$AmBe with the production physics of neutrons is dependent only on alpha-beryllium interaction and is independent of what happened to the neutron after it was generated. The geometries have been designed to get a volume of uniform neutron densities within a spherical volume of radius 15 cm in every neutron energy group up to 10 MeV. Absorbers of different dimensions were placed within the volume to investigate the field perturbation. Different neutron absorbers were used to correlate the phenomenon to the integral cross-section of the absorber. Flux density inside and outside the absorber samples was determined, while the spatial neutron flux distribution produced by the AmBe source without an absorber was taken as a reference. This study displayed that absorbers of various dimensions perturb the neutron field in a way that is dependent on the absorption and scattering cross-sections, particularly in the neutron resonance region. Unlike the simple picture of reducing the number density of neutrons, the perturbation was found to influence the moderation of neutrons in the medium, significantly above 1 MeV.

   hep-phPhys.Scripta(2022)·1 citation
10. 10*

    Quintessential Axions from a New Confining Force

    Jihn E. Kim🇰🇷 · Younggeun Kim🇰🇷 · Soonkeon Nam🇰🇷

    Almost massless mesons created at the condensation scale of extra nonabelian gauge group can be candidates of dark energy source. This can be another motivation for introducing an additional confining force.

    hep-phhep-th2 citations
11. 11*

    Leptonic cascade decays of a heavy Higgs boson through vectorlike leptons at the LHC

    Radovan Dermisek🇺🇸 · Junichiro Kawamura🇰🇷 · Enrico Lunghi🇺🇸 · Navin McGinnis🇨🇦 · Seodong Shin🇰🇷

    We demonstrate the potential of fully leptonic cascade decays of a heavy neutral Higgs boson through vectorlike leptons as a simultaneous probe for extended Higgs sectors and extra matter particles at the LHC. The processes we explore are unique in that their event topologies lead to di-boson-like leptonic final states with a lepton pair which does not reconstruct the mass of a gauge boson. By recasting existing $2\ell +E_T^{\mathrm{miss}}$ and $3/4\ell$ searches channels using run2 data from the LHC we obtain $\text{model independent}$ bounds on the masses of heavy scalars and vectorlike leptons and use these results to explore future prospects at the HL-LHC. Our results can be directly applied to any kind of new physics scenarios sharing the final states and the event topology. For concreteness, we apply our results to a benchmark scenario: a two Higgs doublet model type-II augmented with vectorlike leptons. Remarkably, even with current data the sensitivity of our analysis shows a reach for masses of a heavy neutral Higgs and vectorlike leptons up to 2 TeV and 1.5 TeV, respectively. Even for low $\tan \beta \gtrsim 1,$ the analysis retains sensitivity to heavy Higgs masses slightly above 1 TeV. The future sensitivities at the HL-LHC extend the reach for heavy Higgses and new leptons to 2.7 TeV and 2 TeV, respectively.

    hep-phhep-exJHEP(2022)·12 citations
12. 12*

    Radio bounds on the mixed dark matter scenarios of primordial black holes and WIMPs

    Kenji Kadota🇨🇳 · Hiroyuki Tashiro🇯🇵

    We study the synchrotron radio emission in the mixed dark matter scenarios consisting of the primordial black holes (PBHs) and the self-annihilating WIMPs (weakly interacting massive particles). The WIMPs can form the ultracompact minihalos around PBHs and the annihilation enhancement from these dense halos can lead to the efficient synchrotron radiation at the radio frequency in the presence of galactic magnetic fields. The upper bound of PBH fraction with respect to the total dark matter abundance is of order $10^{-8}\sim 10^{-5}$ depending on the electroweak scale WIMP mass ($m_{\chi }=10\sim 1000$ GeV) and the WIMP annihilation channel (e.g. a hadronic $\chi \chi \to b\bar{b}$ or a leptonic $\chi \chi \to e^{+}{e}^{-}$ channel). The PBH contribution to the total dark matter abundance is hence negligible when the other component of dark matter is composed of the conventional electroweak scale WIMPs.

    hep-phastro-ph.COJCAP(2022)·11 citations
13. 13*

    ${\Sigma }_c{\Sigma }_c$ interactions in chiral effective field theory

    Kan Chen🇨🇳 · Bo-Lin Huang🇨🇳 · Bo Wang🇨🇳 · Shi-Lin Zhu🇨🇳

    We study the interactions of the ${\Sigma }_c{\Sigma }_c$ system in the framework of chiral effective theory. We consider the contact, one-pion and two-pion exchange interactions and bridge the low energy constants of the ${\Sigma }_c{\Sigma }_c$ system to those of the ${\Sigma }_c^{(\ast )}{\bar{D}}^{(\ast )}$ systems through the quark-level ansatz for the contact interaction. We explore the influence of intermediate channels in the two-pion exchange diagrams of the ${\Sigma }_c{\Sigma }_c$ system. We obtain a deep bound state $[{\Sigma }_c{\Sigma }_c{]}_{J=0}^{I=0}$ and a shallow bound state $[{\Sigma }_c{\Sigma }_c{]}_{J=1}^{I=1}$. As a byproduct, we further investigate the interactions of the ${\Lambda }_c{\Lambda }_c$ and ${\Lambda }_c{\Sigma }_c$ systems.

    hep-phhep-ex13 citations
14. 14*

    The low-lying hidden- and double-charm tetraquark states in a constituent quark model with Instanton-induced Interaction

    Jin-Bao Wang🇨🇳 · Gang Li🇨🇳 · Chun-Sheng An🇨🇳 · Cheng-Rong Deng🇨🇳 · Ju-Jun Xie🇨🇳

    Spectrum of the low-lying hidden- and double-charm tetraquark states are investigated in a nonrelativistic quark potential model, where the Instanton-induced interaction is taken as the residual spin-dependent hyperfine interaction between quarks. The model parameters are fixed by fitting the spectrum of the ground hadron states. Our numerical results show that masses of several presently studied tetraquark states are close to those of the experimentally observed candidates of exotic meson, which indicates that the corresponding compact tetraquark components may take considerable probabilities in those observed exotic states.

    hep-phEPJC(2022)·20 citations
15. 15*

    $Z_n$ symmetry in the vortex muon decay

    Pengcheng Zhao🇨🇳

    Polarization of a vortex state fermion has rich structure due to the nontrivial momentum distribution of wave function. This larger freedom provides an unique opportunity to prepare fermions in exotic polarized states, which do not exist for plane-wave state fermions. Based on the so called spin-orbit state which was studied both theoretically and experimentally, we put forward a peculiar vortex muon whose polarization exhibits $Z_n$ symmetry and study its decay. We investigate the azimuthal distribution of the emitted electrons and find that it exhibits the same symmetry ($Z_n$) as the initial state.

    hep-phJ.Phys.G(2023)·5 citations
16. 16*

    Interpretation of the ${\Omega }_c\to {\pi }^{+}\Omega (2012)\to {\pi }^{+}(\bar{K}\Xi )$ relative to ${\Omega }_c\to {\pi }^{+}\bar{K}\Xi$ from the $\Omega (2012)$ molecular perspective

    Natsumi Ikeno🇯🇵 · Wei-Hong Liang🇨🇳 · Genaro Toledo🇲🇽 · Eulogio Oset🇪🇸

    We present a mechanism for ${\Omega }_c\to {\pi }^{+}\Omega (2012)$ production through an external emission Cabibbo favored weak decay mode, where the $\Omega (2012)$ is dynamically generated from the interaction of $\bar{K}{\Xi }^{\ast }(1530)$, $\eta \Omega$, with $\bar{K}\Xi$ as the main decay channel. The $\Omega (2012)$ decays later to $\bar{K}\Xi$ in this picture, with results compatible with Belle data. The picture has as a consequence that one can evaluate the direct decay ${\Omega }_c^0\to {\pi }^{+}{K}^{-}{\Xi }^0$ and the decay ${\Omega }_c^0\to {\pi }^{+}\bar{K}{\Xi }^{\ast }$, ${\pi }^{+}\eta \Omega$ with direct coupling of $\bar{K}{\Xi }^{\ast }$ and $\eta \Omega$ to $K^{-}{\Xi }^0$. We show that, within uncertainties and using data from a recent Belle measurement, all these three channels account for about (12-20)\% of the total ${\Omega }_c\to {\pi }^{+}{K}^{-}{\Xi }^0$ decay rate. The consistency of the molecular picture with all the data is established by showing that ${\Omega }_c\to {\Xi }^0{\bar{K}}^{\ast 0}\to {\Xi }^0{K}^{-}{\pi }^{+}$ together with ${\Omega }_c\to {\pi }^{+}{\Omega }^{\ast }\to {\pi }^{+}{K}^{-}{\Xi }^0$ account for about 85\% of the total ${\Omega }_c\to {\pi }^{+}{K}^{-}{\Xi }^0$.

    hep-phPRD(2022)·28 citations
17. 17*

    Electroweak Phase Transition in a Dark Sector with CP Violation

    Lisa Biermann🇩🇪 · Margarete Mühlleitner🇩🇪 · Jonas Müller🇩🇪

    In this paper, we investigate the possibility of a strong first-order electroweak phase transition (SFOEWPT) in the model `CP in the Dark'. The Higgs sector of the model consists of two scalar doublets and one scalar singlet with a specific discrete symmetry. After spontaneous symmetry breaking the model has a Standard-Model-like phenomenology and a hidden scalar sector with a viable Dark Matter candidate supplemented by explicit CP violation that solely occurs in the hidden sector. The model `CP in the Dark' has been implemented in the C++ code BSMPT v2.3 which performs a global minimisation of the finite-temperature one-loop corrected effective potential and searches for SFOEWPTs. An SFOEWPT is found to be allowed in a broad range of the parameter space. Furthermore, there are parameter scenarios where spontaneous CP violation is generated at finite temperature. The in addition spontaneously broken ${\mathbb{Z}}_2$ symmetry then leads to mixing between the dark and the visible sector so that CP violation in the dark is promoted at finite temperature to the visible sector and thereby provides additional sources of CP violation that are not restricted by the electric dipole moment measurements at zero temperature. Thus, `CP in the Dark' provides a promising candidate for the generation of the baryon asymmetry of the universe through electroweak baryogenesis.

    hep-phEPJC(2023)·20 citations
18. 18*

    Mass Spectroscopy and Decay Properties of ${\Xi }_{cb}$, ${\Xi }_{bb}$ Baryons

    Amee Kakadiya🇮🇳 · Chandni Menapara🇮🇳 · Ajay Kumar Rai🇮🇳

    Using the Hypercentral Constituent Quark Model (hCQM), the mass spectra of doubly heavy baryons ${\Xi }_{cb}$ and ${\Xi }_{bb}$ are determined. The model describes an interaction inside the baryonic system. Screened potential has been considered as confining potential with color-Coloumb potential to enumerate the masses of baryonic states. Regge trajectories have been plotted in $(J,M^2)$ plane. The properties like magnetic moment and radiative decay width have been determined using the obtained results.

    hep-phInt.J.Mod.Phys.A(2023)·9 citations
19. 19*

    Spin of protons in NICA and PTR storage rings as an axion antenna

    Nikolai N. Nikolaev🇷🇺

    We discuss a new approach to search for axions in the storage ring experiments, applicable at short coherence time of the in-plane polarization as is the case for protons. The technique can readily be applied at any storage ring equipped with internal polarimeter for the radial polarization of the beam (COSY, NICA, PTR). We point out a possibility of substantial broadening of the range of attianable axion masses in storage rings with the hybrid electric and magnetic bending, the PTR proton storage ring being an example.

    hep-phPisma Zh.Eksp.Teor.Fiz.(2022)·14 citations
20. 20*

    First concurrent extraction of the leading-order scalar and spin proton polarizabilities

    E. Mornacchi (1)🇩🇪 · S. Rodini (2)🇩🇪 · B. Pasquini (3 and 4)🇮🇹 · P. Pedroni (4) ((1) Institut für Kernphysik, Johannes Gutenberg-Universität Mainz, Mainz, Germany, (2) Institut für Theoretische Physik, Universität Regensburg, Regensburg, Germany, (3) Dipartimento di Fisica, Università degli Studi di Pavia, Pavia, Italy, (4) INFN Sezione di Pavia, Pavia, Italy)🇮🇹

    We performed the first simultaneous extraction of the six leading-order proton polarizabilities. We reached this milestone thanks to both new high-quality experimental data and an innovative bootstrap-base fitting method. These new results provide a self-consistent and fundamental benchmark for all future theoretical and experimental polarizability estimates.

    hep-phnucl-exnucl-thPRL(2022)·8 citations
21. 21*

    One-loop squared amplitudes for hadronic $tW$ production at next-to-next-to-leading order in QCD

    Long-Bin Chen🇨🇳 · Liang Dong🇨🇳 · Hai Tao Li🇨🇳 · Zhao Li🇨🇳 · Jian Wang🇨🇳 · Yefan Wang🇨🇳

    We present the analytic results of one-loop squared amplitudes for $tW$ production at a hadron collider. The calculation is performed using the method of differential equations. After renormalization, we have checked that the infrared divergences agree with the general structure predicted by anomalous dimensions. The finite remainder contributes to the next-to-next-to-leading order hard function, one of the essential ingredients in the factorization formula of the cross section near the infrared region, which can be used in resummation of all-order soft gluon effects or a differential next-to-next-to-leading order calculation based on the phase space slicing method.

    hep-phJHEP(2022)·9 citations
22. 22*

    Ultraviolet freeze-in baryogenesis

    Andreas Goudelis🇫🇷 · Dimitrios Karamitros🇬🇧 · Pantelis Papachristou🇬🇷 · Vassilis C. Spanos🇬🇷

    We study a mechanism through which the cosmic dark matter density can be explained simultaneously with the observed baryon asymmetry of the Universe. At the core of our proposal lie the out-of-equilibrium scattering processes of bath particles which are responsible for the production of feebly-interacting dark matter. The same processes violate $CP$, which further leads to an asymmetry between matter and antimatter being generated in the visible sector. We focus on the possibility that these interactions are described through non-renormalizable operators, which leads to both dark matter and the baryon asymmetry being produced at high temperatures. The mechanism is exemplified by studying two concrete scenarios, one involving scalar and one involving fermion dark matter. We find that in both cases it is, indeed, possible to achieve a common explanation for the dark matter content and the matter-antimatter asymmetry of the Universe, provided that dark matter is in the keV mass range.

    hep-phastro-ph.COhep-thPRD(2022)·9 citations
23. 23*

    Flavour and dark matter in a scoto/type-II seesaw model

    D.M. Barreiros🇵🇹 · H.B. Camara🇵🇹 · F.R. Joaquim🇵🇹

    The neutrino mass and dark matter (DM) problems are addressed in a Standard Model extension where the type-II seesaw and scotogenic mechanisms coexist. The model features a flavour ${\mathcal{Z}}_8$ discrete symmetry which is broken down to a ${\mathcal{Z}}_2$, stabilising the (scalar or fermion) DM particle. Spontaneous CP violation is implemented through the complex vacuum expectation value of a singlet scalar field, inducing observable CP-violating effects in the lepton sector. The structure of the effective neutrino mass matrix leads to constraints on the low-energy neutrino observables, namely the atmospheric neutrino mixing angle ${\theta }_{23}$, the Dirac CP-violating phase $\delta$ and the absolute neutrino mass scale $m_{\mathrm{lightest}}$. In particular, in most cases, the model selects one ${\theta }_{23}$ octant with $\delta \simeq 3\pi /2$. Moreover, the obtained lower bounds on $m_{\mathrm{lightest}}$ are typically in the range probed by cosmology. We also analyse the constraints imposed on the model by current experimental limits on charged lepton flavour violating (cLFV) processes, as well as future projected sensitivities. It is shown that the Higgs triplet and scotogenic contributions to cLFV never overlap and that the interplay among Yukawa couplings, dark charged scalar masses and mixing leads to a wide parameter-space region compatible with current experimental bounds. We investigate the scalar and fermion DM parameter space of our model by considering relic density, direct-detection (DD) and collider constraints. For scalar DM the mass interval $68\text{GeV}\lesssim m_{\text{DM}}\lesssim 90\text{GeV}$ is viable and will be probed by future DD searches. In the fermion DM case, correct relic density is always obtained for $m_{\text{DM}}\gtrsim 45$ GeV thanks to dark fermion-scalar coannihilation channels.

    hep-phJHEP(2022)·25 citations
24. 24*

    Running away from the T-parameter solution to the W mass anomaly

    Rick S. Gupta🇮🇳

    We show that it is essential to include renormalisation group (RG) effects for determining the SMEFT parameter space consistent with the CDF W-mass anomaly at the matching scale. This is because operators that are only weakly constrained--for instance those probed by diboson and Higgs data--can have a contribution to the W-boson mass via one-loop RG effects, that is comparable to the tree-level contribution of the much more strongly constrained operators related to electroweak precision observables. We RG evolve the low energy SMEFT parameter space consistent with the anomaly to the matching scale and find a much larger allowed region. In particular we find that it is possible to have a vanishing or even negative T -parameter at the matching scale. This will hopefully lead to a larger set of UV completions that can explain the anomaly. For the one-loop contributions to be important a relatively low new physics scale around 800 GeV is required. This enhances the possibility of probing this new physics in direct and indirect searches in the recent future.

    hep-phhep-ex25 citations
25. 25*

    Mathematical formulae for neutron self-shielding properties of media in an isotropic neutron field

    Ateia W. Mahmoud🇪🇬 · Elsayed K. Elmaghraby🇪🇬 · E. Salama🇪🇬 · A. Elghazaly🇪🇬 · S. A. El-fiki🇪🇬

    The complexity of the neutron transport phenomenon throws its shadows on every physical system wherever neutron is produced or used. In the current study, an ab initio derivation of the neutron self-shielding factor to solve the problem of the decrease of the neutron flux as it penetrates into a material placed in an isotropic neutron field. We have employed the theory of steady-state neutron transport, starting from Stuart's formula. Simple formulae were derived based on the integral cross-section parameters that could be adopted by the user according to various variables, such as the neutron flux distribution and geometry of the simulation at hand. The concluded formulae of the self-shielding factors comprise an inverted sigmoid function normalized with a weight representing the ratio between the macroscopic total and scattering cross-sections of the medium. The general convex volume geometries are reduced to a set of chord lengths, while the neutron interactions probabilities within the volume are parameterized to the epithermal and thermal neutron energies. The arguments of the inverted-sigmoid function were derived from a simplified version of neutron transport formulation. Accordingly, the obtained general formulae were successful in giving the values of the experimental neutron self-shielding factor for different elements and different geometries.

    ↳ physics.comp-phhep-phnucl-thPhys.Scripta(2024)·1 citation
26. 26*

    The $SL(K+3,\mathbb{C})$ symmetry of string scatterings from D-branes

    Sheng-Hong Lai🇹🇼 · Jen-Chi Lee🇹🇼 · Yi Yang🇹🇼

    By using the solvability of Lauricella function $F_D^{(K)}\left(\alpha ;{\beta }_1,...,{\beta }_K;\gamma ;x_1,...,x_K\right)$ with nonpositive integer ${\beta }_J$, we show that each scattering or decay process of string and D-brane states at \textit{arbitrary} mass levels can be expressed in terms of a single Lauricella function. This result extends the previous exact $SL(K+3,\mathbb{C})$ symmetry of tree-level open bosonic string theory to include the D-brane.

    ↳ hep-thhep-phmath-phmath.MPNPB(2023)·2 citations
27. 27*

    Stueckelberg and Higgs Mechanisms: Frames and Scales

    Alexander D. Popov🇩🇪

    We consider Yang-Mills theory with a compact gauge group $G$ on Minkowski space ${\mathbb{R}}^{3,1}$ and compare the introduction of masses of gauge bosons using the Stueckelberg and Higgs mechanisms. The Stueckelberg field $\varphi$ is identified with a $G$-frame on the gauge vector bundle $E$ and the kinetic term for $\varphi$ leads to the mass of the gauge bosons. The Stueckelberg mechanism is extended to the Higgs mechanism by adding to the game a scalar field describing rescaling of metric on fibres of $E$. Thus, we associate Higgs fields as well as running coupling parameters with conformal geometry on fibres of gauge bundles. In particular, a running coupling tending to zero or to infinity is equivalent to an unbounded expansion of $G$-fibres or its contraction to a point. We also discuss scale connection, space-time dependent Higgs vacua and compactly supported gauge and quark fields as an attribute of confinement.

    ↳ hep-thgr-qchep-lathep-phUniverse(2022)·4 citations
28. 28*

    New physics searches with the ILD detector at the ILC

    Mikael Berggren (for the ILD concept group)🇩🇪

    Although the LHC experiments have searched for and excluded many proposed new particles up to masses close to 1 TeV, there are many scenarios that are difficult to address at a hadron collider. This talk will review a number of these scenarios and present the expectations for searches at an electron-positron collider such as the International Linear Collider. The cases discussed include the light Higgsino, the stau lepton in the coannihilation region relevant to dark matter, and heavy vector bosons coupling to the s-channel in e${}^{+}$e${}^{-}$ annihilation. The studies are based on the ILD concept at the ILC.

    ↳ hep-exhep-ph0 citations
29. 29*

    Radio sky reveals primordial electron-proton interactions

    Shyam Balaji🇫🇷 · Maura E. Ramirez-Quezada🇯🇵 · Celine Boehm🇦🇺

    For several decades, astronomers have measured the electromagnetic emission in the universe from the lowest to the highest energies with incredible precision. The lowest end of the spectrum, corresponding to radio waves, is fairly well studied and understood. Yet there is a long standing discrepancy between measurements and predictions, which has prompted the construction of many new models of radio emitters. Here we show that remnant electron-proton interactions, leading to photon production in the early universe, also referred to as cosmic free-free emission, solves the discrepancy between theory and observations. While the possibility of cosmic free-free emission has been postulated for several decades, this is the first time that the amplitude and shape of the signal has been computed and its existence demonstrated. Using current measurements we estimate this emission to become important from around a redshift of $z\simeq 2150$. This contribution from fundamental particles and interactions represents the lowest energy test from the early universe of one of the pillars of modern physics, Quantum Electrodynamics. The next generation of deep radio surveys will be able to measure primordial signals from this cosmic era with greater precision and further solidify our understanding of the radio sky.

    ↳ astro-ph.COhep-ph1 citation
30. 30*

    Going Beyond the Galaxy Power Spectrum: an Analysis of BOSS Data with Wavelet Scattering Transforms

    Georgios Valogiannis🇺🇸 · Cora Dvorkin🇺🇸

    We perform the first application of the wavelet scattering transform (WST) to actual galaxy observations, through a WST analysis of the BOSS DR12 CMASS dataset. We included the effects of redshift-space anisotropy, non-trivial survey geometry, systematic weights, and the Alcock-Paczynski distortion effect, following the commonly adopted steps for the power spectrum analysis. In order to capture the cosmological dependence of the WST, we use galaxy mocks obtained from the state-of-the-art ABACUSSUMMIT simulations, tuned to match the anisotropic correlation function of the BOSS CMASS sample in the redshift range $0.46<z<0.60$. Using our model for the WST coefficients, as well as for the first 2 multipoles of the galaxy power spectrum, that we use as reference, we perform a likelihood analysis of the CMASS data. We obtain the posterior probability distributions of 4 cosmological parameters, $\{{\omega }_b,{\omega }_c,n_s,{\sigma }_8\}$, as well as the Hubble constant, derived from a fixed value of the angular size of the sound horizon at last scattering measured by the Planck satellite, all of which are marginalized over the 7 nuisance parameters of the Halo Occupation Distribution model. The WST is found to deliver a substantial improvement in the values of the predicted $1\sigma$ errors compared to the regular power spectrum, which are tighter by a factor of $3-5$ in the case of flat and uninformative priors and by a factor of $3-8$, when a Big Bang Nucleosynthesis prior is applied on the value of ${\omega }_b$. Our results are investigative and subject to certain approximations, which we discuss in the text.

    ↳ astro-ph.COastro-ph.GAastro-ph.IMhep-phPRD(2022)·63 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.