Tue·May 31, 2022Tuesday·May 31, 2022

1. 01*

   The Ellipse of Muon Dipole Moments

   Radovan Dermisek🇺🇸 · Keith Hermanek🇺🇸 · Navin McGinnis🇨🇦 · Sangsik Yoon🇺🇸

   We show that any new interaction resulting in a chirally-enhanced contribution to the muon magnetic moment necessarily modifies the decay rate of the Higgs boson to muon pairs or generates the muon electric dipole moment. These three observables are highly correlated, and near future measurements of $h\to {\mu }^{+}{\mu }^{-}$ will carve an ellipse in the plane of dipole moments for any such model. Together with the future measurements of the electric dipole moment many models able to explain the muon g-2 anomaly can be efficiently tested.

   hep-phPRL(2022)·22 citations
2. 02*

   Light charged Higgs boson in $H^{\pm }h$ associated production at the LHC

   A. Arhrib🇲🇦 · R. Benbrik🇲🇦 · M. Krab🇲🇦 · B. Manaut🇲🇦 · S. Moretti🇬🇧 · Y. Wang🇨🇳 · Q.-S. Yan🇨🇳

   We investigate the light charged Higgs boson production via $pp\to H^{\pm }h$ at the Large Hadron Collider (LHC) in the Two-Higgs Doublet Model (2HDM) type-I. By focusing on a scenario where $H$ is the observed Higgs boson of mass 125 GeV, we study the aforementioned Higgs boson production channel and explore its bosonic decay $H^{\pm }\to W^{\pm }h$. The latter can have a sizable rate that possibly dominates, over the fermionic decay channels, in several regions of the viable parameter space. We demonstrate that the production process $pp\to H^{\pm }h$ followed by $H^{\pm }\to W^{\pm }h$ could be the most promising experimental avenue to search for light $H^{\pm }$ at the LHC.

   hep-ph11 citations
3. 03*

   Signal strength and W-boson mass measurements as a probe of the electro-weak phase transition at colliders -- Snowmass White Paper

   Andreas Papaefstathiou🇺🇸 · Tania Robens🇭🇷 · Graham White🇯🇵

   We consider an extension of the scalar sector of the Standard Model (SM) by an additional gauge singlet, which mixes with a part of the SM-like Higgs doublet. Within this model, parameter-space regions exist that can lead to a strong first-order electro-weak phase transition, a necessary condition for electro-weak baryogenesis. We discuss how such regions of the parameter space can be tested using the SM-like Higgs boson's signal strength measurements, as well as precision observables, such as e.g. the W-boson mass, at current and future colliders.

   hep-ph15 citations
4. 04*

   CP violation in non-leptonic B decays as a portal to New Physics

   Robert Fleischer🇳🇱

   CP violation offers a powerful probe for testing the Standard Model. In this endeavour, non-leptonic decays of B mesons play a key role. I will discuss benchmark decays and puzzling patterns emerging from theoretical analyses of the current data.

   hep-phhep-exPoS(2022)·4 citations
5. 05*

   Investigations on the flavor-dependent axial charges of the octet baryons

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

   We have investigated the axial charges of the ground octet baryons within the extended chiral constituent quark model, where all the possible compact five-quark Fock components $qqq(q\bar{q})(q=u,d,s)$ in the baryons are considered. The transition couplings between the three- and five-quark components in the baryons are assumed to be via the ${}^3{P}_0$ mechanism, which could reproduce the sea asymmetry in proton very well. The numerical results for the flavor-dependent axial charges of the octet baryons are comparable to those predicted by other theoretical approaches. It is shown that the singlet axial charges of the octet baryons, which should indicate total baryons spin arising from the spin of the quarks, fall in the range $0.45-0.75$ in present model. This is in consistent with the predictions by lattice QCD and chiral perturbation theory. It's also very interesting that the light quarks spin $\Delta u$ and $\Delta d$ in the $\Lambda$ baryon are of small but negative values, which exactly vanish in the traditional three-quark model.

   hep-phPRC(2022)·7 citations
6. 06*

   Thermal and thermoelectric responses of hot QCD medium in time-varying magnetic fields

   Gowthama K K🇮🇳 · Manu Kurian🇮🇳 · Vinod Chandra🇮🇳

   The thermal response of the hot QCD matter has been studied in the presence of a time-varying magnetic field. The impact of magnetic field, its time dependence, and the collision aspects of the medium on thermal transport have been studied within the relativistic kinetic theory. The decay time of the magnetic field in the medium seems to have a strong dependence on thermal conductivity. The applicability of the Wiedemann-Franz law for the QCD medium has been investigated in the presence of time-varying external electromagnetic fields. The phenomenological significance of thermal transport in heavy-ion collision experiments has also been investigated by relating the thermal conductivity to the elliptic flow through the Knudsen number. The investigations are extended to study the thermoelectric behavior of hot QCD medium and its dependence on the magnetic field. The time dependent magnetic field is observed to significantly influence the thermoelectric behavior of the medium.

   hep-phnucl-thPRD(2022)·23 citations
7. 07*

   Comment on "A phenomenological ${\pi }^{-}p$ scattering length from pionic hydrogen''

   Evangelos Matsinos

   This short technical note addresses a number of issues regarding the estimates of the 2004 paper by Ericson, Loiseau, and Wycech for the corrections ${\delta }_{ϵ}$ and ${\delta }_{\Gamma }$, which aim at the removal of the effects of electromagnetic origin from the measurements of the strong-interaction shift ${ϵ}_{1s}$ and of the total decay width ${\Gamma }_{1s}$ of the ground state in pionic hydrogen.

   hep-phnucl-th1 citation
8. 08*

   Charged Higgs boson production via $pp\to H^{\pm }bj$ at the LHC

   Rachid Benbrik🇲🇦 · Mohamed Krab🇲🇦 · Mohamed Ouchemhou🇲🇦

   The searches for charged Higgs bosons can be used to probe new physics at the LHC. In the current study, we concentrate on the associated production of the charged Higgs boson with the bottom quark and the jet in Two-Higgs Doublet Model (2HDM) type-I as promising mode for a light $H^{\pm }$, i.e. $m_{H^{\pm }}<m_t$. For this we consider the two situations where $h$ or $H$ is the SM-type Higgs boson discovered with a mass close to 125 GeV and investigate its bosonic decays, namely $H^{\pm }\to W^{\pm }h$ and/or $H^{\pm }\to W^{\pm }A$. The potential signals at the LHC are then discussed, under both theoretical and experimental constraints. Over a substantial region of the 2HDM type-I parameter space, a promising alternative signals that could be used for the discovery of $H^{\pm }$ states at the LHC are identified as $qbW+2b/2\tau /2\gamma$.

   hep-ph0 citations
9. 09*

   TRSM Benchmark Planes -- Snowmass White Paper

   Tania Robens🇭🇷

   In this whitepaper, I briefly review the Benchmark Planes in the Two-Real-Singlet Model (TRSM), a model that enhances the Standard Model (SM) scalar sector by two real singlets that obey a ${\mathbb{Z}}_2\otimes {\mathbb{Z}}_2^{\prime }$ symmetry. In this model, all fields acquire a vacuum expectation value, such that the model contains in total 3 CP-even neutral scalars that can interact with each other. All interactions with SM-like particles are inherited from the SM-like doublet via mixing. I remind the readers of the previously proposed benchmark planes, and briefly discuss possible production at future Higgs factories.

   hep-ph8 citations
10. 10*

    Meson scattering in a Lorentz-violating scalar QED at finite temperature

    M. C. Araújo🇧🇷 · R. V. Maluf🇧🇷

    This paper investigates how the nonzero temperature affects the differential cross-section for mesons scattering in a Lorentz-violating extension of the scalar electrodynamics. We initially discuss some features of the model and extract the zero temperature Feynman rules. Temperature effects are introduced using the Thermo Field Dynamics (TFD) formalism. It is shown that the corrections induced on the meson scattering are very large in the high-temperature regime. Furthermore, our results also suggest that temperature effects may contribute to new constraints on the Lorentz-violating parameters.

    hep-phAnnals Phys.(2022)·7 citations
11. 11*

    Heavy-light hybrid mesons with different spin-parities

    B. Barsbay🇹🇷 · K. Azizi🇮🇷 · H. Sundu🇹🇷

    The spectroscopic parameters of the heavy-light hybrid mesons with different spin-parities and different quark contents are investigated in the framework of the QCD sum rule method. The mass and current coupling of these states are calculated by taking into account the quark, gluon and mixed vacuum condensates up to dimension 10. The obtained results are compared with the existing QCD Laplace sum rule predictions. The results of mass and current coupling for all the considered channels are obtained to be stable and reliable. Our results can be useful for future experimental searches as well as theoretical studies of different parameters related to the hybrid mesons and their decays and interactions with other particles.

    hep-phhep-exhep-latEPJC(2022)·14 citations
12. 12*

    On the effective lagrangian at nonzero isospin chemical potential

    Angel Gómez Nicola🇪🇸 · Andrea Vioque-Rodríguez🇪🇸

    We revisit the most general effective lagrangian within Chiral Perturbation Theory at nonzero isospin chemical potential. In addition to the contributions already considered in the literature, we discuss the effects of new terms allowed by the symmetries, derived within the external source method including spurion fields, as well as of linear-field corrections. We study the influence of those new contributions on the energy density at zero temperature and observables derived from it, such as the pion and quark condensates and the isospin density. Corrections are shown to be compatible with lattice results, which favor a nonzero value for the only undetermined low-energy constant (LEC) to leading order $\mathcal{O}(p^2)$, rendering in particular a shift of the critical value for Bose-Einstein condensation. To $\mathcal{O}(p^4)$ we study the physical constraints on the new LEC, which renormalize the energy density and whose numerical effect is estimated within natural values. The new $\mathcal{O}(p^4)$ corrections give rise to more significant deviations than those previously considered and remain compatible with lattice results.

    hep-phPRD(2022)·7 citations
13. 13*

    Two-body Baryonic $B_{u,d,s}$ and $B_c$ to Charmless Final State Decays

    Chun-Khiang Chua🇹🇼

    We study the rates and direct CP violations of two-body baryonic ${\bar{B}}_{u,d,s}\to {\mathbf{B}\overline{\mathbf{B}}}^{\prime }$ and $B_c^{-}\to {\mathbf{B}\overline{\mathbf{B}}}^{\prime }$ decays, where the final state baryons include low-lying octet and decuplet baryons. We incorporate topological amplitude formalism and the factorization approach. Asymptotic relations at large $m_b$ are used to simplify decay amplitudes. Using the most up-to-date data on ${\bar{B}}^0\to p\bar{p}$ and $B^{-}\to \Lambda \bar{p}$ decay rates as inputs, rates and direct CP violations of ${\bar{B}}_{u,d,s}\to {\mathbf{B}\overline{\mathbf{B}}}^{\prime }$ decays are revised and predicted. It is interesting that the results on rates satisfy all existing experimental bounds and some are close to the bounds. Factorization diagrams contribute to penguin-exchange, exchange, annihilation and penguin-annihilation amplitudes. Although the resulting penguin-exchange factorization amplitudes are sizable, the rest suffer from severe chiral suppression and are sensitive to non-factorizable contributions. The ${\bar{B}}_s\to p\bar{p}$ decay rate predicted in factorization calculation is very rare, but it can be enhanced by including non-factorizable contributions. The case where the rate is enhanced to saturate the present experimental bound is discussed. As annihilation modes $B_c^{-}\to {\mathbf{B}\overline{\mathbf{B}}}^{\prime }$ decays from factorization calculation are found to be very rare, but they can be enhanced by including non-factorizable contributions as well. Small direct CP violations of pure penguin modes in $\Delta S=-1$ ${\bar{B}}_{u,d,s}\to {\mathbf{B}\overline{\mathbf{B}}}^{\prime }$ decays are robust predictions of the SM, while vanishing direct CP violations of exchange modes in ${\bar{B}}_{u,d,s}\to {\mathbf{B}\overline{\mathbf{B}}}^{\prime }$ decays and in all $B_c^{-}\to {\mathbf{B}\overline{\mathbf{B}}}^{\prime }$ decay modes are null tests of the SM.

    hep-phhep-exPRD(2022)·7 citations
14. 14*

    $T_{cc}^{+}$ and $X(3872)$ with the complex scaling method and $DD(\bar{D})\pi$ three-body effect

    Zi-Yang Lin🇨🇳 · Jian-Bo Cheng🇨🇳 · Shi-Lin Zhu🇨🇳

    We use the leading order (LO) contact interactions and OPE potentials to investigate the newly observed double-charm state $T_{cc}^{+}$. The $DD\pi$ three-body effect is important in this system since the intermediate states can go on shell. We keep the dependence of the pion propagators on the center-of-mass energy, which results in a unitary cut of the OPE potential at the $DD\pi$ three-body threshold. By solving the complex scaled Schrödinger equation, we find a pole corresponding to the $T_{cc}^{+}$ on the physical Riemann sheet. Its width is around 80 keV and nearly independent of the choice of the cutoff. Assuming the $D\bar{D}\pi$ and $D{\bar{D}}^{\ast }$ channels as the main decay channels, we apply the similar calculations to the $X(3872)$, and find its width is even smaller. Besides, the isospin breaking effect is significant for the $X(3872)$ while its impact on the $T_{cc}^{+}$ is relatively small.

    hep-phPRD(2024)·40 citations
15. 15*

    Generic no-scale inflation inspired from string theory compactifications

    Lina Wu🇨🇳 · Tianjun Li🇨🇳

    We propose the generic no-scale inflation inspired from string theory compactifications. We consider the Kähler potentials with an inflaton field $\phi$, as well as one, two, and three Kähler moduli. Also, we consider the renormalizable superpotential of $\phi$ in general. We study the spectral index and tensor-to-scalar ratio in details, and find the viable parameter spaces which are consistent with the Planck and BICEP/Keck experimental data on the cosmic microwave background (CMB). The spectral index is $n_s\simeq 1-2/N\sim 0.965$ for all models, and the tensor-to-scalar ratio $r$ is $r\simeq 12/N^2$, $83/N^4$ and $4/N^2$ for the one, two and three moduli models, respectively. The particular $r$ for two moduli model comes from the contributions of the non-negligible higher order term in potential. In the three moduli model, the scalar potential is similar to the global supersymmetry, but the Kähler potential is different. The E-model with $\alpha =1$ and T-model with $\alpha =1/3$ can be realized in the one modulus model and the three moduli model, respectively. Interestingly, the models with quadratic and quartic potentials still satisfy the current tight bound on $r$ after embedding into no-scale supergravity.

    hep-phgr-qchep-thPRD(2022)·2 citations
16. 16*

    Momentum-dependence of $\rho -\omega$ mixing in the pion vector form factor and its effect on $(g-2{)}_{\mu }$

    Yun-Hua Chen🇨🇳 · Meng-Ge Qin🇨🇳

    The inclusion of the $\rho -\omega$ mixing effect is essential for a precise description of the pion electromagnetic form factor in the $e^{+}{e}^{-}\to {\pi }^{+}{\pi }^{-}$ process, which quantifies the two-pion contribution to the anomalous magnetic moment of the muon $a_{\mu }$. In this paper, we analyse the momentum dependence of the $\rho -\omega$ mixing by considering loop contributions at the next-to-leading order in the $1/N_C$ expansion within the framework of resonance chiral theory. We revisit the work [Y. H. Chen, D. L. Yao, and H. Q. Zheng, Commun. Theor. Phys. 69 (2018) 1], considering the contribution arising from the kaon mass splitting in the kaon loops and the latest experimental data. We perform two kinds of fits (with momentum-independent or momentum-dependent $\rho -\omega$ mixing amplitude) to describe the $e^{+}{e}^{-}\to {\pi }^{+}{\pi }^{-}$ and $\tau \to {\nu }_{\tau }2\pi$ data within the energy region of 600$\sim$900 MeV and the decay width of $\omega \to {\pi }^{+}{\pi }^{-}$, and compare their results. Our findings indicate that both the momentum-independent and momentum-dependent $\rho -\omega$ mixing schemes provide appropriate descriptions of the data. However, the momentum-dependent scheme exhibits greater self-consistency, considering the reasonable imaginary part of the mixing matrix element ${\Pi }_{\rho \omega }$ obtained. Regarding the contribution to the anomalous magnetic moment of the muon, $a_{\mu }^{\pi \pi }{|}_{[0.6,0.9]\text{GeV}}$, the results obtained from the fits considering the momentum-dependent $\rho -\omega$ mixing amplitude agree well with those obtained without incorporating the momentum dependence of the $\rho -\omega$ mixing, within the margin of errors. Furthermore, based on the fitted values of the relevant parameters, we observe that the decay width of $\omega \to {\pi }^{+}{\pi }^{-}$ is predominantly influenced by the $\rho -\omega$ mixing effect.

    hep-phhep-exnucl-thCPC(2023)·1 citation
17. 17*

    Exposing the dead-cone effect of jet quenching in QCD medium

    Yun-Fan Liu🇨🇳 · Wei Dai🇨🇳 · Ben-Wei Zhang🇨🇳 · Enke Wang🇨🇳

    When an energetic parton traverses the hot QCD medium it may suffer multiple scattering and lose its energy. The medium-induced gluon radiation for a massive quark will be suppressed relative to that of a light quark due to the dead-cone effect. The development of new declustering techniques of jet evolution makes a direct study of the dead-cone effect in the QCD medium possible for the first time. In this work, we compute the emission angle distribution of the charm-quark initiated splittings in ${\mathrm{D}}^0$ meson tagged jet and that of the light parton initiated splittings in an inclusive jet in p+p and Pb+Pb at $5.02$~TeV by utilizing the declustering techniques of jet evolution. The heavy quark propagation and indued energy loss in the QCD medium are simulated with the SHELL model based on the Langevin equation. By directly comparing the emission angle distributions of charm-quark-initiated splittings with those of light parton-initiated splittings at the same energy intervals of the initial parton, we provide insights into the fundamental splitting structure in A+A collisions, thereby exploring the possible observation of the dead-cone effect in medium-induced radiation. We further investigate the case of the emission angle distributions normalized to the number of splittings and find the dead-cone effect will broaden the emission angle of the splitting and reduce the possibility to occur such splitting, therefore leading the massive parton to lose less energy. We also find the collisional energy loss mechanism has a negligible impact on the medium modification to the emission angle distribution of the charm-quark initiated splittings for ${\mathrm{D}}^0$-meson tagged jets.

    hep-phnucl-thCPC(2025)·11 citations
18. 18*

    The Inflaton that Could : Primordial Black Holes and Second Order Gravitational Waves from Tachyonic Instability induced in Higgs-$R^2$ Inflation

    Dhong Yeon Cheong🇰🇷 · Kazunori Kohri🇯🇵 · Seong Chan Park🇰🇷

    The running of the Higgs self coupling may lead to numerous phenomena in early universe cosmology. In this paper we introduce a scenario where the Higgs running induces turns in the trajectory passing a region with tachyonic mass, leading to a temporal tachyonic growth in the curvature power spectrum. This effect induced by the Higgs leaves phenomena in the form of primordial black holes and stochastic gravitational waves, where proposed GW observatories will be able to probe in the near future.

    hep-phastro-ph.COgr-qchep-thJCAP(2022)·35 citations
19. 19*

    Lepton Flavour Violation Identification in Tau Decay (${\tau }^{-}\to {\mu }^{-}{\mu }^{-}{\mu }^{+}$) Using Artificial Intelligence

    Reymond Mesuga🇵🇭

    The discovery of neutrino oscillation, proving that neutrinos do have masses, reveals the misfits of particles in the current Standard Model (SM) theory. In theory, neutrinos having masses could result in lepton flavour not being a symmetry called Lepton Flavour Violation (LFV). While SM theory extensions allowed LFV processes, their branching fractions are too small, making them unobservable even with the strongest equipment up-to-date. With that, scientists in recent years have generated LFV-like processes from the combined LHCb and Monte-Carlo-Simulated data in an attempt to identify LFV using Artificial Intelligence (AI), specifically Machine Learning (ML) and Deep Learning (DL). In this paper, the performance of several algorithms in AI has been presented, such as XGBoost, LightGBM, custom 1-D Dense Block Neural Networks (DBNNs), and custom 1-D Convolutional Neural Networks (CNNs) in identifying LFV signals, specifically ${\tau }^{-}\to {\mu }^{-}{\mu }^{-}{\mu }^{+}$ decay from the combined LHCb and Monte-Carlo-Simulated data that imitates the signatures of the said decay. Kolmogorov-Smirnov (KS) and Cramer-von Mises (CvM) tests were also conducted to verify the validity of predictions for each of the trained algorithms. The result shows decent performances among algorithms, except for the LightGBM, for failing the CvM test, and a 20-layered CNN for having recorded a considerably low AUC. Meanwhile, XGBoost and a 10-layered DBNN recorded the highest AUC of 0.88. The main contribution of this paper is the extensive experiment involving custom DBNN and CNN algorithms in different layers, all of which have been rarely used in the past years in identifying LFV-like signatures, unlike GBMs and tree-based algorithms, which have been more popular in the said task.

    hep-phcs.LG0 citations
20. 20*

    Freeze-in dark matter in EDGES 21-cm signal

    Shengyu Wu🇨🇳 · Shuai Xu🇨🇳 · Sibo Zheng🇨🇳

    The first measurement on temperature of hydrogen 21-cm signal reported by EDGES strongly favors Coulomb-like interaction between freeze-in dark matter and baryon fluid. We investigate such dark matter both in one- and two-component context, with the light force carrier(s) essential for the Coulomb-like interaction not being photon. Using a conversion of cross sections used by relevant experiments and Boltzmann equations to encode effects of the dark matter-baryon interaction, we show that both cases are robustly excluded by the stringent stellar cooling bounds in the sub-GeV dark matter mass range. The exclusion of one-component case applies to simplified freeze-in dark matter with the light force carrier as dark photon, gauged $B-L$, $L_e-L_{\mu }$,$L_e-L_{\tau }$ or axion-like particle, while the exclusion of two-component case applies to simplified freeze-in dark matter with the two light force carriers as two axion-like particles coupled to standard model quarks and leptons respectively.

    hep-phastro-ph.COCPC(2023)·3 citations
21. 21*

    Higgs boson decays $h\to Z\gamma$ and $h\to m_{V}Z$ in the $U(1{)}_X$SSM

    Xi Wang🇨🇳 · Shu-Min Zhao🇨🇳 · Tong-Tong Wang🇨🇳 · Lu-Hao Su🇨🇳 · Wei Li🇨🇳 · Ze-Ning Zhang🇨🇳 · Zhong-Jun Yang🇨🇳 · Tai-Fu Feng🇨🇳

    We present a detailed analysis of the Higgs boson decays $h\to Z\gamma$ and $h\to m_{V}Z$ in the $U(1{)}_X$SSM, with $m_V$ denoting the meson ($\omega ,\rho ,\varphi ,J/\psi ,{\rm Y}$). Using the effective Lagrangian method, we calculate the effective constants $C_{\gamma Z}$ (CP-even) and ${\tilde{C}}_{\gamma Z}$ (CP-odd) for the vertex $h\gamma Z$, which are corrected by the new particle loop diagrams. Numerically, the ratio ${\Gamma }_{U(1{)}_X}(h\to Z\gamma )/{\Gamma }_{SM}(h\to Z\gamma )$ is between $1.02-1.35$. For the vector mesons $\omega ,\rho ,\varphi$ and $J/\psi$, the ratios ${\Gamma }_{U(1{)}_X}(h\to m_{V}Z)/{\Gamma }_{SM}(h\to m_{V}Z)$ are mainly distributed in the range of ($1.01-1.45$). When $m_V$ represents ${\rm Y}$, the larger value of the ratio ${\Gamma }_{U(1{)}_X}(h\to {\rm Y}Z)/{\Gamma }_{SM}(h\to {\rm Y}Z)$ is mostly located in the range of ($1.002-1.30$). This work can provide a reference for specific types of decay processes which can be searched in LHC.

    hep-phEPJC(2022)·3 citations
22. 22*

    Flavor- and CP-safe explanation of $g_{\mu }-2$ anomaly

    Jason L. Evans🇨🇳 · Tsutomu T. Yanagida🇨🇳 · Norimi Yokozaki🇨🇳

    Supersymmetry is still a viable explanation for the muon $g-2$ anomaly, if the sleptons and electroweak gauginos are $\mathcal{O}(100)$ GeV. However, for supersymmetry breaking masses this light, the SUSY flavor and CP-problem are exacerbated. To address this issue, we consider a flavor-safe gauge mediated explanation of the muon $g-2$ with additional Higgs soft supersymmetry breaking mass parameters. The setup provides a generic parameter space within minimal gauge mediation. Furthermore, we show that the problematic CP violating phase can be dynamically suppressed. We find that gauge mediation models have large portions of parameter space where the muon $g-2$ can be explained at 1 $\sigma$ level. The interplay between the slepton and the CP-odd Higgs masses also makes the majority of this model's parameter space testable at the LHC through searches for sleptons or additional Higgs bosons.

    hep-phhep-exJHEP(2023)·2 citations
23. 23*

    On the origin of the reactor antineutrino anomalies in light of a new summation model with parameterized ${\beta }^{-}$ transitions

    A. Letourneau🇫🇷 · V. Savu🇫🇷 · D. Lhuillier🇫🇷 · Th. Lasserre🇫🇷 · Th. Materna🇫🇷 · G. Mention🇫🇷 · X. Mougeot🇫🇷 · A. Onillon🇫🇷 · L. Perisse🇫🇷 · M. Vivier🇫🇷

    We investigate the possible origins of the norm and shape reactor antineutrino anomalies in the framework of a summation model (SM) where ${\beta }^{-}$ transitions are simulated by a phenomenological Gamow-Teller $\beta$-decay strength model. The general trends of the discrepancies to the Huber-Mueller model on the antineutrino side can be reproduced both in norm and shape. From the exact electron-antineutrino correspondence of the SM model, we predict similar distortions in the electron spectra, suggesting that biases on the reference fission-electron spectra could be at the origin of the anomalies.

    hep-phhep-exPRL(2023)·33 citations
24. 24*

    $W$ boson mass tension caused by its right-handed gauge coupling at high energies?

    She-Sheng Xue🇮🇹

    The CDF collaboration's recent high-precision measurement of the $W$mass is in $7.0\sigma$ disagreement with the Standard Model expectation. This tension will be relieved if the $W$ boson has a non-trivial right-handed gauge coupling at high energies. At TeV scales, the SM gauge symmetric four-fermion interactions induce a right-handed gauge coupling, and SM fermions compose massive composite particles. We investigate the top-quark mass produced by spontaneous symmetry breaking and compute the $W$ and $Z$ boson propagators and decays. The right-handed coupling corrections to their masses and widths are consistent with experimental measurements. We discuss how SM gauge bosons and composite particles can restore parity-preserving gauge symmetries at TeV scales.

    hep-phNPB(2022)·8 citations
25. 25*

    Axial-vector form factor of nucleons in the isospin medium from the hard-wall AdS/QCD model

    Ibrahim Atayev🇦🇿 · Shahin Mamedov🇦🇿

    We study the axial-vector form factor of the nucleons at constant and homogenous isospin chemical potential using holographic QCD. Nucleon mass splitting in such isospin medium is taken into account. According to AdS/CFT correspondence, the critical value of the isospin chemical potential \mu_I equals to UV- boundary value of the time component of the bulk gauge field. We calculate the axial-vector form factor of the proton and neutron in such background in the framework of the hard-wall model and plot the form factors for the isospin chemical potential critical value \mu_I=m_{\pi}.

    hep-phInt.J.Theor.Phys.(2022)·6 citations
26. 26*

    Type-II see-saw: searching the LHC elusive low-mass triplet-like Higgses at $e^{-}{e}^{+}$ colliders

    Saiyad Ashanujjaman🇮🇳 · Kirtiman Ghosh🇮🇳 · Katri Huitu🇫🇮

    While the triplet-like Higgses up to a few hundred GeV masses are already excluded for a vast region of the model parameter space from the LHC searches, strikingly, there is a region of this parameter space that is beyond the reach of the existing LHC searches, and doubly/singly-charged and neutral Higgses as light as 200 GeV or even lighter are still allowed by the LHC data. We study several search strategies targeting different parts of this LHC elusive parameter space at two configurations of $e^{-}{e}^{+}$ colliders -- 500 GeV and 1 TeV centre of mass energies. We find that a vast region of this parameter space could be probed with 5$\sigma$ discovery with the early $e^{-}{e}^{+}$ colliders' data.

    hep-phhep-exPRD(2022)·20 citations
27. 27*

    On the definition of electromagnetic local spatial densities for composite spin-$1/2$ systems

    J.Yu. Panteleeva🇩🇪 · E. Epelbaum🇩🇪 · J. Gegelia🇩🇪 · U.-G. Meißner🇩🇪

    An unambiguous definition of the electromagnetic spatial densities for a spin-1/2 system is proposed and worked out in the zero average momentum frame and in moving frames. The obtained results are compared with the traditional definition of the densities in terms of the three-dimensional Fourier transforms of the electromagnetic form factors in the Breit frame.

    hep-phhep-thnucl-exnucl-thPRD(2022)·36 citations
28. 28*

    Explanation of electron and muon $g-2$ anomalies in AMSB

    Song Li🇨🇳 · Zhuang Li🇨🇳 · Fei Wang🇨🇳 · Jin Min Yang🇨🇳

    We propose to jointly explain the electron/muon $g-2$ anomalies in the framework of anomaly mediated SUSY breaking (AMSB) scenario. Two Yukawa deflected AMSB models are proposed and discussed in depth: one with lepton-specific interactions and the other one with messenger-matter interactions. Both models are found to be able to jointly explain the anomalies at $2\sigma$ level by naturally realizing the preferred parameter space with $\mu M_1,\mu M_2<0$ and very heavy left-handed smuon.

    hep-phhep-exNPB(2022)·17 citations
29. 29*

    Analytic continuation of harmonic sums: dispersion representation

    V.N. Velizhanin🇷🇺

    We present a simple representation for analytically continued nested harmonic sums for the arbitrary complex argument. This representation can be obtained for a wide range of nested harmonic sums from a precomputed database for the pole expressions of these sums near negative integers. We describe the procedure for the precise numerical evaluations of the corresponding results from the dispersion representation.

    hep-phhep-thNPB(2022)·4 citations
30. 30*

    Disentangling Lepton Flavour Universal and Lepton Flavour Universality Violating Effects in $b\to s{\ell }^{+}{\ell }^{-}$ Transitions

    Marcel Algueró🇪🇸 · Bernat Capdevila🇪🇸 · Andreas Crivellin🇨🇭 · Joaquim Matias🇪🇸

    In this letter we propose a strategy for discerning if new physics in the Wilson coefficient ${\mathcal{C}}_{9\mu }$ is dominantly lepton flavour universality violating or if it contains a sizable lepton flavour universal component (${\mathcal{C}}_9^{\mathrm{U}}$). Distinguishing among these two cases, for which the model independent fit of the related scenarios exhibits similar pulls w.r.t. the Standard Model, is crucial to advance our understanding of the $B$ anomalies. We first identify the origin of the degeneracy of these two cases and point out the key observables that can break it. In particular, while the observables measured so far that test lepton flavour universality exhibit similar dependencies to all the relevant Wilson coefficients, the forthcoming measurement of $Q_5=P_5^{\prime \mu }-P_5^{\prime e}$ is particularly sensitive to ${\mathcal{C}}_{9\mu }-{\mathcal{C}}_{9e}$. In fact, if $Q_5$ were found to be small (i.e. close to its Standard Model value), this would imply a small ${\mathcal{C}}_{9\mu }-{\mathcal{C}}_{9e}$ but a sizable ${\mathcal{C}}_9^{\mathrm{U}}$, given the preference of global fits for a large negative new physics contribution in ${\mathcal{C}}_{9\mu }$. We discuss the possible origins of ${\mathcal{C}}_9^{\mathrm{U}}$, in particular how it could originate from new physics. Here, a promising scenario, that could even link $b\to s{\ell }^{+}{\ell }^{-}$ to $R_{D^{(\ast )}}$, is the one in which ${\mathcal{C}}_9^{\mathrm{U}}$ is generated from a tau loop via an off-shell photon penguin diagram. This setup predicts the branching ratios of $B_s\to {\tau }^{+}{\tau }^{-}$ and $B\to K^{(\ast )}{\tau }^{+}{\tau }^{-}$ to lie within the reach of LHCb, CMS and Belle II. Alternatively, in case of a non-observation of these tauonic processes, we show that the most natural possibility to generate ${\mathcal{C}}_9^{\mathrm{U}}$ is a $Z^{\prime }$ with partially lepton flavour universal couplings.

    hep-phhep-exPRD(2022)·51 citations
31. 31*

    Generating the Electro-Weak Scale by Vector-like Quark Condensation

    Sophie Klett🇩🇪 · Manfred Lindner🇩🇪 · Andreas Trautner🇩🇪

    We show that vector-like quarks in the fundamental or higher-dimensional representations of QCD can generate the electro-weak scale in a phenomenologically viable way by chiral symmetry breaking condensates. The thereby generated scales are determined by numerically solving the Dyson-Schwinger equation and these scales are sizable, because they grow with the hard vector-like mass. Communicating such a scale to the Standard Model via a conformally invariant scalar sector can dynamically generate the electro-weak scale without a naturalness problem, because all non-dynamical mass scales are protected by chiral symmetry. We present a minimal setup which requires only a new neutral scalar with mass not too far above the electro-weak scale, as well as vector-like quarks at the (multi-)TeV scale. Both are consistent with current bounds and are attractive for future experimental searches at the LHC and future colliders. Depending on the hypercharge of the vector-like quarks, hadrons made of them are color-neutral bound states which would be interesting Dark Matter candidates.

    hep-phSciPost Phys.(2023)·5 citations
32. 32*

    $a$-Anomalous Interactions of the Holographic Dilaton

    Csaba Csaki🇺🇸 · Jay Hubisz🇺🇸 · Ameen Ismail🇺🇸 · Gabriele Rigo🇫🇷 · Francesco Sgarlata🇺🇸

    We explore higher-derivative terms in the low-energy effective action for the dilaton, the Goldstone boson of spontaneously broken scale invariance. Focusing on the simplest holographic realization of spontaneously broken scale invariance, the Randall-Sundrum (RS) scenario, we identify the nonlinear action for the RS dilaton by integrating out Kaluza-Klein graviton modes. The coefficient of a particular four-derivative dilaton self-interaction can be identified with the Weyl $a$-anomaly of the dual conformal field theory, which we use to verify anomaly matching arguments. We also find novel, $a$-dependent couplings of the dilaton to light matter fields. These anomalous interactions can have a significant effect on the collider phenomenology and the cosmology, potentially allowing us to probe the structure of the underlying conformal sector via low-energy physics. The dilaton effective theory also serves as an interesting scalar analog of gravity, and we study solutions to the equation of motion that parallel black holes and cosmologies.

    hep-phhep-thPRD(2022)·9 citations
33. 33*

    Renormalization group effects in astrophobic axion models

    Luca Di Luzio🇮🇹 · Federico Mescia🇪🇸 · Enrico Nardi🇮🇹 · Shohei Okawa🇪🇸

    It has been recently pointed out that in certain axion models it is possible to suppress simultaneously both the axion couplings to nucleons and electrons, realising the so-called astrophobic axion scenarios, wherein the tight bounds from SN1987A and from stellar evolution of red giants and white dwarfs are greatly relaxed. So far, however, the conditions for realising astrophobia have only been set out in tree-level analyses. Here we study whether these conditions can still be consistently implemented once renormalization group effects are included in the running of axion couplings. We find that axion astrophobia keeps holding, albeit within fairly different parameter space regions, and we provide analytical insights into this result. Given that astrophobic axion models generally feature flavour violating axion couplings, we also assess the impact of renormalization group effects on axion-mediated flavour violating observables.

    hep-phastro-ph.SRPRD(2022)·24 citations
34. 34*

    The physics case for neutrino-neutrino collisions

    Sitian Qian🇨🇳 · Tianyi Yang🇨🇳 · Sen Deng🇨🇳 · Jie Xiao🇨🇳 · Leyun Gao🇨🇳 · Andrew Michael Levin🇨🇳 · Qiang Li🇨🇳 · Meng Lu🇨🇳 · Zhengyun You🇨🇳

    Addressing the mass origin and properties of neutrinos is of strong interest to particle physics, baryogenesis and cosmology. Popular explanations involve physics beyond the standard model, for example, the dimension-5 Weinberg operator or heavy Majorana neutrinos arising from ``seesaw'' models. The current best direct limits on the electron neutrino mass, derived from nuclei beta decay or neutrinoless double beta decay processes, are at the sub-electronvolt level. Here we propose a novel neutrino neutrino collider where the neutrino beam is generated from TeV scale muon decays. Such collisions can happen between either neutrinos and anti-neutrinos, or neutrinos and neutrinos. We find that with a tiny integrated luminosity of about $10^{-5}$/fb we can already expect to observe direct neutrino anti-neutrino annihilation, $\nu \bar{\nu }\to \mathrm{Z}$, which also opens the door to explore neutrino related resonances $\nu \bar{\nu }\to \mathrm{X}$. The low luminosity requirement can accommodate a relatively large emittance muon beam. Such a device would also allow for probing heavy Majorana neutrino and effective Majorana neutrino mass through $\nu \nu \to \mathrm{HH}$ to a competitive level, for both electron and muon types.

    hep-phhep-exJ.Phys.G(2024)·7 citations
35. 35*

    Absorbing the Arrow of Electromagnetic Radiation

    Mario Hubert🇯🇵 · Charles T. Sebens🇯🇵

    We argue that the asymmetry between diverging and converging electromagnetic waves is just one of many asymmetries in observed phenomena that can be explained by a past hypothesis and statistical postulate (together assigning probabilities to different states of matter and field in the early universe). The arrow of electromagnetic radiation is thus absorbed into a broader account of temporal asymmetries in nature. We give an accessible introduction to the problem of explaining the arrow of radiation and compare our preferred strategy for explaining the arrow to three alternatives: (i) modifying the laws of electromagnetism by adding a radiation condition requiring that electromagnetic fields always be attributable to past sources, (ii) removing electromagnetic fields and having particles interact directly with one another through retarded action-at-a-distance, (iii) adopting the Wheeler-Feynman approach and having particles interact directly through half-retarded half-advanced action-at-a-distance. In addition to the asymmetry between diverging and converging waves, we also consider the related asymmetry of radiation reaction.

    ↳ physics.hist-phhep-phStud.Hist.Phil.Sci.(2023)·0 citations
36. 36*

    Quasiparticles in nonperturbative vacuum

    Vladimir Dzhunushaliev🇰🇿 · Vladimir Folomeev🇰🇬

    The model of nonperturbative vacuum in SU(2) Yang-Mills theory coupled to a nonlinear spinor field is suggested. By analogy with Abelian magnetic monopole dominance in quantum chromodynamics, it is assumed that the dominant contribution to such vacuum is coming from quasiparticles described by dipolelike solutions existing in this theory. Using an assumption of the behavior of the number density of quasiparticles whose energy approaches infinity, we derive an approximate expression for the energy density of such nonperturbative vacuum, which turns out to be finite, unlike an infinite energy density of perturbative vacuum. Using characteristic values of the parameters appearing in the expression for the nonperturbative energy density, it is shown that this density may be of the order of the energy density associated with Einstein's cosmological constant. The physical interpretation of the spinor field self-coupling constant as a characteristic distance between quasiparticles is suggested. The questions of experimental verification of the nonperturbative vacuum model under consideration and of determining its pressure are briefly discussed.

    ↳ hep-thhep-ph0 citations
37. 37*

    The effects of the QCD critical point on the spectra and flow coefficients of hadrons

    Sushant K. Singh🇮🇳 · Jan-e Alam🇮🇳

    The space-time evolution of the hot and dense fireball of quarks and gluons produced in ultra-relativistic heavy-ion collisions at non-zero baryonic chemical potential and temperature has been studied by using relativistic viscous causal hydrodynamics. For this purpose a numerical code has been developed to solve the relativistic viscous causal hydrodynamics in (3+1)-dimensions with the inclusion of QCD critical point (CP) through the equation of state and scaling behaviour of the transport coefficients. We have evaluated the transverse momentum spectra, directed and elliptic flow coefficients of pions and protons to comprehend the effect of CP on these observables by using this code. It is found that the integration over the entire space-time history of the fireball largely obliterates the effects of CP on the spectra and flow coefficients.

    ↳ nucl-thhep-exhep-phPRD(2023)·4 citations
38. 38*

    The Shadow of Supertranslated Schwarzschild Black Hole

    Qing-Hua Zhu🇨🇳 · Yu-Xuan Han🇨🇳 · Qing-Guo Huang🇨🇳

    The supertranslated black hole proposed by Hawking, Perry, and Strominger might provide a resolution to the information paradox, which is usually defined by a complicated space-time metric with even less space-time symmetries compared to Kerr black hole. In this paper, we figure out the shadow for the supertranslated Schwarzschild black hole by making use of supertranslated 4-velocities and the trajectories of the light rays. Based on this approach, we find that the photon sphere gets distorted due to the supertranslation hairs and the position of the shadow on the projection plane is shifted by the supertranslation vector, but the size and shape of the shadow remain the same as those of Schwarzschild black hole.

    ↳ gr-qchep-phhep-thEPJC(2023)·9 citations
39. 39*

    Anti-stars in the Milky Way and primordial black holes

    A.D. Dolgov🇷🇺

    Astronomical data of the several recent years, which present an evidence in favour of abundant antimatter population in our Galaxy, Milky Way, are analysed. The data include: registration of gamma-rays with energy 0.511 MeV, which surely originate from electron-positron annihilation at rest, very large flux of anti-helium nuclei, discovered at AMS, and 14 stars which produce excessive gamma-rays with energies of several hundred MeV which may be interpreted as indication that these stars consist of antimatter. Theoretical predictions of these phenomena, made much earlier ago are described

    ↳ astro-ph.GAhep-phNuovo Cim.C(2022)·0 citations
40. 40*

    Data-driven hadronic interaction model for atmospheric lepton flux calculations

    Anatoli Fedynitch🇹🇼 · Matthias Huber🇩🇪

    The leading contribution to the uncertainties of atmospheric neutrino flux calculations arise from the cosmic-ray nucleon flux and the production cross sections of secondary particles in hadron-air interactions. The data-driven model developed in this work parametrizes particle yields from fixed-target accelerator data. The propagation of errors from the accelerator data to the inclusive muon and neutrino flux predictions results in smaller uncertainties than in previous estimates, and the description of atmospheric flux data is good. The model is implemented as part of the MCEq package, and hence can be flexibly employed for theoretical flux error estimation at neutrino telescopes.

    ↳ astro-ph.HEhep-exhep-phPRD(2022)·27 citations
41. 41*

    Space-time resolved quantum field approach to Klein tunneling dynamics across a finite barrier

    M. Alkhateeb🇫🇷 · A. Matzkin🇫🇷

    We investigate Klein tunneling through finite potential barriers with space-time resolved solutions to relativistic quantum field equations. We find that no particle actually tunnels through a finite supercritical barrier, even in the case of resonant tunneling. The transmission is instead mediated by modulations in pair production rates, at each edge of the barrier, caused by the incoming electron. We further examine the effect of the barrier's width on the numbers of produced pairs in the fermionic case (characterized by saturation) and in the bosonic case (characterized by exponential superradiance). This work paves the way to precise studies of the radiating dynamics of supercritical barriers, and could be applied to certain analogs of Klein tunneling observed in systems modeled by relativistic wave equations.

    ↳ quant-phhep-phhep-thPRA(2022)·10 citations
42. 42*

    From elasticity tetrads to rectangular vielbein

    G.E. Volovik🇫🇮

    The paper is devoted to the memory of Igor E. Dzyaloshinsky. In our common paper I.E. Dzyaloshinskii and G.E. Volovick, Poisson brackets in condensed matter, Ann. Phys. {\bf 125} 67--97 (1980), we discussed the elasticity theory described in terms of the gravitational field variables -- the elasticity vielbein $E_{\mu }^a$. They come from the phase fields, which describe the deformations of crystal. The important property of the elasticity vielbein $E_{\mu }^a$ is that in general they are not the square mstrices. While the spacetime index $\mu$ takes the values $\mu =(0,1,2,3)$, in crystals the index $a=(1,2,3)$, in vortex lattices $a=(1,2)$, and in smectic liquid crystals there is only one phase field, $a=1$. These phase fields can be considered as the spin gauge fields, which are similar to the gauge fields in Standard Model (SM) or in Grand Unification (GUT). On the other hand, the rectangular vielbein $e_a^{\mu }$ may emerge in the vicinity of Dirac points in Dirac materials. In particular, in the planar phase of the spin-triplet superfluid ${}^3$He the spacetime index $\mu =(0,1,2,3)$, while the spin index $a$ takes values $a=(0,1,2,3,4)$. Although these $(4\times 5)$ vielbein describing the Dirac fermions are rectangular, the effective metric $g^{\mu \nu }$of Dirac quasiparticles remains (3+1)-dimensional. All this suggests the possible extension of the Einstein-Cartan gravity by introducing the rectangular vielbein, where the spin fields belong to the higher groups, which may include SM or even GUT groups.

    ↳ physics.class-phcond-mat.othergr-qchep-phAnnals Phys.(2022)·8 citations
43. 43*

    Composite pseudo Nambu Goldstone Quintessence

    Mayukh R. Gangopadhyay🇮🇳 · Nilanjana Kumar🇮🇳 · Ankan Mukherjee🇮🇳 · Mohit K. Sharma🇮🇳

    A pseudo-Nambu Goldstone Boson (pNGB) arising from the breaking of a global symmetry ($G\to H$) can be one of the most promising candidates for the quintessence model, to explain the late-time acceleration of our universe. Motivated from the Composite Higgs scenario, we have investigated the case where the pNGB associated with $SO(N)/SO(N-1)$ develops a potential through its couplings with the particles that do not form the complete representations of $G$. The Coleman Weinberg (CW) potential is generated via the external particles in the loop which are linked with the strongly interacting dynamics and can be computed predicatively. The model of Dark Energy (DE) is tested against several latest cosmological observations such as supernovae data of Pantheon, Baryon Acoustic Oscillation (BAO), Redshift-space distortion (RSD) data, etc. We have found that the fit prefers the sub-Planckian value of the pNGB field decay constant. Moreover, we have found that the model predicts cosmological parameters well within the allowed range of the observation and thus gives a well-motivated model of quintessence.

    ↳ astro-ph.COgr-qchep-phNew Astron.(2025)·2 citations
44. 44*

    Micro-Bose/Proca dark matter stars from black hole superradiance

    John March-Russell🇬🇧 · João G. Rosa🇵🇹

    We study the production of heavy, $\mu \gtrsim 1$ TeV, bosonic spin $s=0,1$ dark matter (DM) via the simultaneous processes of Hawking evaporation and superradiance (SR) from an initial population of small, $\lesssim 10^6$ kg, primordial black holes (PBHs). Even for small initial PBH spins the SR process can produce extremely dense gravitationally-bound DM Bose or Proca soliton "stars" of radius $\lesssim \mathrm{pm}$ and mass $\sim 10^{\mathrm{few}}$ kg that can survive to today, well after PBH decay. These solitons can constitute a significant fraction of the DM density, rising to $\gtrsim 50\%$ in the vector DM case.

    ↳ gr-qcastro-ph.COhep-phPRD(2026)·19 citations
45. 45*

    Tidal Love Numbers of Novel and Admixed Celestial Objects

    Michael Collier🇬🇧 · Djuna Croon🇬🇧 · Rebecca K. Leane🇺🇸

    A sub-fraction of dark matter or new particles trapped inside celestial objects can significantly alter their macroscopic properties. We investigate the new physics imprint on celestial objects by using a generic framework to solve the Tolman-Oppenheimer-Volkoff (TOV) equations for up to two fluids. We test the impact of populations of new particles on celestial objects, including the sensitivity to self-interaction sizes, new particle mass, and net population mass. Applying our setup to neutron stars and boson stars, we find rich phenomenology for a range of these parameters, including the creation of extended atmospheres. These atmospheres are detectable by their impact on the tidal love number, which can be measured at upcoming gravitational wave experiments such as Advanced LIGO, the Einstein Telescope, and LISA. We release our calculation framework as a publicly available code, allowing the TOV equations to be generically solved for arbitrary new physics models in novel and admixed celestial objects.

    ↳ gr-qcastro-ph.HEastro-ph.SRhep-phPRD(2022)·54 citations
46. 46*

    Primordial black hole mergers from three-body interactions

    Gabriele Franciolini🇮🇹 · Konstantinos Kritos🇺🇸 · Emanuele Berti🇺🇸 · Joseph Silk🇫🇷

    Current gravitational-wave observations set the most stringent bounds on the abundance of primordial black holes (PBHs) in the solar mass range. This constraint, however, inherently relies on the merger rate predicted by PBH models. Previous analyses have focused mainly on two binary formation mechanisms: early Universe assembly out of decoupling from the Hubble expansion and dynamical capture in present-day dark matter structures. Using reaction rates of three-body processes studied in the astrophysical context, we show that, under conservative assumptions, three-body interactions in PBH halos efficiently produce binaries. Those binaries form at high redshift in Poisson-induced PBH small-scale structures and a fraction is predicted to coalesce and merge within the current age of the Universe, at odds with the dynamical capture scenario where they merge promptly. In general, we find that this channel predicts rates comparable to the dynamical capture scenario. However, binaries formed from three-body interactions do not significantly contribute to the overall PBH merger rate unless PBHs made up a dominant fraction of the dark matter above the solar mass range, a scenario that is ruled out by current constraints. Our results support strong bounds on the PBH abundance in the stellar mass range derived from Laser Interferometer Gravitational-Wave Observatory/Virgo/KAGRA observations. Finally, we show that both dynamical channels are always subdominant compared to early Universe assembly for PBH mergers in the asteroid mass range, while we expect it to become relevant in scenarios where PBHs are initially strongly clustered.

    ↳ astro-ph.COgr-qchep-phPRD(2022)·49 citations
47. 47*

    Evaporation of Echoing Black Holes

    Naritaka Oshita🇯🇵 · Hayato Motohashi🇯🇵 · Sousuke Noda🇯🇵

    We compute the graybody factor and evaporation rate of a rotating black hole in the presence of a hypothetical reflective surface slightly outside the outer horizon radius, assuming that it spontaneously emits thermal radiation due to quantum-gravitational effects such as firewalls or stretched horizons. As a result of a resonance caused by a cavity between the reflective surface and angular momentum barrier, the graybody factor is subject to a modulation in the frequency space. By taking into account this effect for multiangular modes of neutrinos, photons, and gravitons, we numerically compute the time development of the mass and angular momentum of the black hole, and show that the excited reflective surface shortens the lifetime of quantum black holes.

    ↳ gr-qchep-phhep-thPRD(2022)·4 citations
48. 48*

    Review of Muon-Proton Collider Proposals: Main Parameters

    Burak Dagli🇹🇷 · Bora Ketenoglu🇹🇷 · Saleh Sultansoy🇹🇷

    Construction of future Muon Collider (or dedicated mu-ring) tangential to the energy frontier pp colliders will give opportunity to realize mu-p collisions at multi-TeV center of mass energies at a luminosity of order of $10^{33}$ cm${}^{-2}$s${}^{-1}$ ($10^{34}$ cm${}^{-2}$s${}^{-1}$). Obviously, such colliders will essentially enlarge the physics search potential of corresponding muon and hadron colliders for both the SM (especially for clarifying QCD basics) and BSM phenomena. This paper is devoted to review of main parameters of mu-p colliders proposed until now.

    ↳ physics.acc-phhep-exhep-ph8 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.