Wed·Jul 31, 2024Wednesday·July 31, 2024

1. 01*

   The Proton Charge Radius from Dimuon Photoproduction off the Proton

   Yong-Hui Lin🇩🇪 · Feng-Kun Guo🇨🇳 · Ulf-G. Meißner🇩🇪

   We investigate the feasibility of measuring the proton charge radius through dimuon photoproduction off a proton target. Our findings indicate that the Bethe-Heitler mechanism, which dominates at small momentum transfers, allows for an extraction of the proton electromagnetic form factors in the extremely low $Q^2$ region below $10^{-3}$ GeV${}^2$ in the spacelike region, when the incident photon beam energy exceeds several hundred MeV. The optimal kinematical region and a sensitivity study of the proton charge radius from dimuon photoproduction are presented. Such a measurement is expected to provide an alternative to the elastic muon-proton scattering measurements such as MUSE at PSI and AMBER at CERN.

   hep-phhep-exnucl-exnucl-thPLB(2024)·2 citations
2. 02*

   Constraints on non-unitary neutrino mixing in light of atmospheric and reactor neutrino data

   Tetiana Kozynets🇩🇰 · Philipp Eller🇩🇪 · Alan Zander🇩🇪 · Manuel Ettengruber🇩🇪 · D. Jason Koskinen🇩🇰

   While the origin of neutrino masses remains unknown, several key neutrino mass generation models result in a non-unitary three-neutrino mixing matrix. To put such models to test, the deviations of the mixing matrix from unitarity can be measured directly through neutrino oscillation experiments. In this study, we perform a Bayesian analysis of the non-unitary mixing model using the recent public data from atmospheric and reactor neutrino experiments - namely IceCube-DeepCore, Daya Bay, and KamLAND. The novelty of our approach compared to the preceding global fits for non-unitarity is in the detailed treatment of the atmospheric neutrino data, which for the first time includes the relevant flux and detector systematic uncertainties. From the Bayesian posteriors on the individual mixing matrix elements, we derive the non-unitarity constraints in the form of normalisations and closures of the mixing matrix rows and columns, assuming either a fully unconstrained matrix or a physically motivated submatrix scenario. We find comparable constraints for electron and tau row normalisations as other similar studies in literature, and additionally reveal strong correlations between muon and tau row constraints induced by the atmospheric systematic uncertainties. We find that the current data is well described by both unitary and non-unitary mixing models, with a strong preference for the unitary mixing indicated by the Bayes factor. With the upcoming IceCube-Upgrade and JUNO detectors, both featuring superior energy resolution compared to the current atmospheric and reactor neutrino experiments, our constraints on the row normalisations in the submatrix case are expected to improve by 25%, 40%, and 20% in the electron, muon, and tau sectors respectively.

   hep-phhep-exJHEP(2025)·12 citations
3. 03*

   CP asymmetries corresponding to the imaginary parts of the interference terms in cascade decays of heavy hadrons

   Jing-Juan Qi🇨🇳 · Jian-Yu Yang🇨🇳 · Zhen-Hua Zhang🇨🇳

   A mechanism of generating CP violation through the imaginary part of the interference of two amplitudes is proposed. This mechanism has shown clear evidence in decays such as $B^{\pm }\to {\pi }^{\pm }{\pi }^{+}{\pi }^{-}$. The proposed mechanism is helpful in searching for CP violation in bottom and charmed baryon decay processes.

   hep-phPRD(2024)·4 citations
4. 04*

   A GUT Framework for Accidental Composite Dark Matter

   Salvatore Bottaro🇮🇱 · Roberto Contino🇮🇹 · Sonali Verma🇧🇪

   We study and classify $SU(5)$-GUT completions of accidental composite dark matter models. These theories postulate new vectorlike confining dark color dynamics and give an accidentally stable baryonic dark matter candidate. In realistic theories, dark fermion $SU(5)$ irreps split into light dark quarks, whose bound states include the dark matter, and their much heavier GUT partners. A simple analysis shows that such a mass hierarchy requires a fine tuning of parameters and thus implies a naturalness problem. We select theories requiring that all dangerous metastable states decay before the onset of nucleosynthesis through higher-dimensional operators generated at the GUT scale or at the mass scale of dark quark GUT partners. Demanding Standard Model gauge coupling unification puts severe constraints on the landscape of viable theories. Under the assumption of an approximately degenerate spectrum of dark quark GUT partners, we find that only one model gives precision unification.

   hep-phPRD(2025)·0 citations
5. 05*

   Prospects of five-dimensional $L_{\mu }-L_{\tau }$ gauge interactions in the light of elastic neutrino-electron scatterings: The scope of the DUNE near detector

   Dibyendu Chakraborty🇮🇳 · Arindam Chatterjee🇮🇳 · Ayushi Kaushik🇮🇳 · Kenji Nishiwaki🇮🇳

   We discuss the future prospects of a minimally five-dimensional version of the well-motivated scenario for addressing the discrepancy in the muon anomalous magnetic moment, the $U(1{)}_{L_{\mu }-L_{\tau }}$ extension of the standard model (SM) gauge symmetry. Here, multiple associated massive gauge bosons appear thanks to the five-dimensional $U(1{)}_{L_{\mu }-L_{\tau }}$ gauge symmetry, and they contribute to the muon $(g-2)$ and also other processes. We focus on the powerful probe of elastic neutrino-electron scatterings since the upcoming DUNE experiment will explore MeV-scale uncharted regions by previous experiments (e.g., CHARM-II and Borexino) in the near future. We found that even with small kinetic mixing parameters, much of the parameter space, including those satisfying muon $(g-2)$, can be probed using several years of data from the DUNE experiment, focusing on the near detector. In our scenario, interference effects between intermediate-state gauge bosons play an important role. Our results include comparisons between flat and warped extra dimensions.

   hep-phhep-exPRD(2024)·4 citations
6. 06*

   Quantum and thermal pressures from light scalar fields

   Hauke Fischer🇦🇹 · Christian Käding🇦🇹 · Mario Pitschmann🇦🇹

   Light scalar fields play a variety of roles in modern physics, especially in cosmology and modified theories of gravity. For this reason, there is a zoo of experiments actively trying to find evidence for many scalar field models that have been proposed in theoretical considerations. Among those are setups in which the pressures expected to be induced by light scalar fields between two parallel plates are studied, for example, Casimir force experiments. While it is known that classical and quantum pressures caused by light scalar fields could have significant impacts on such experiments, in this article, we show that this can also be the case for thermal pressure. More specifically, we derive expressions for the quantum and thermal pressures induced by exchanges of light scalar field fluctuations between two thin parallel plates. As particular examples, we then look at screened scalar fields. For chameleon, symmetron and environment-dependent dilaton models, we find large regions in their parameter spaces that allow for thermal pressures to equal or exceed the quantum pressures. By comparing with earlier constraints from quantum pressure calculations, we conclude that thermal pressures induced by chameleons are actually of experimental significance.

   hep-phastro-ph.COgr-qchep-th+1Phys.Dark Univ.(2025)·6 citations
7. 07*

   Revealing the Origin of Neutrino Masses through Displaced Shower Searches in the CMS Muon System

   Wei Liu🇨🇳 · Suchita Kulkarni🇦🇹 · Frank F. Deppisch🇬🇧

   We study the potential to probe the origin of neutrino masses, by searching for long-lived right-handed neutrinos (RHNs) $N$ in the $B-L$ model and in the RHN-extended Standard Model (SM) Effective Field Theory (EFT). Despite the small active-sterile mixing $|V_{\ell N}{|}^2$, RHNs are produced abundantly via SM and exotic Higgs production, as long as the Higgs mixing or EFT operator coefficient is sufficiently large. We reinterpret a search for displaced showers in the CMS muon system and we find that it is sensitive to parameter space at and below the seesaw floor, $|V_{\ell N}{|}^2\approx 10^{-12}$ ($\ell =e$, $\tau$) for $m_N\approx 40$ GeV. With existing data constraining such well-motivated scenarios of neutrino mass generation, we determine the projected sensitivity at the HL-LHC, motivating dedicated searches for long-lived RHNs with decay lengths $\approx 10$ m.

   hep-phhep-exPRD(2025)·12 citations
8. 08*

   The Fox-Wolfram Moment of Jet Production in Relativistic Heavy Ion Collisions

   Wei-Xi Kong🇨🇳 · Ben-Wei Zhang🇨🇳

   We present the first theoretical investigation of Fox-Wolfram moments (FWMs) for multi-jet production in relativistic heavy ion collisions. In this work, jet productions in p+p collisions are computed with a Monte Carlo event generator SHERPA, while the Linear Boltzmann Transport model is utilized to simulate the multiple scattering of energetic partons in the hot and dense QCD matter. The event-normalized distributions of the lower-order FWM, $H_1^T$ in p+p and Pb+Pb collisions are calculated. It is found that for events with jet number $n_{\text{jet}}=2$ the $H_1^T$ distribution in Pb+Pb is suppressed at small $H_1^T$ while enhanced at large $H_1^T$ region as compared to p+p. For events with $n_{\text{jet}}>2$, the jet number reduction effect due to jet quenching in the QGP decreases the $H_1^T$ distribution at large $H_1^T$ in Pb+Pb relative to p+p. The medium modification of the Fox-Wolfram moment $H_1^T$ for events with $n_{\text{jet}}\ge 2$ are also presented, which resemble those of events with $n_{\text{jet}}=2$. Its reason is revealed through the relative contribution fractions of events with different final-state jet numbers to $H_1^T$.

   hep-phnucl-thCPC(2025)·1 citation
9. 09*

   HEFT's appraisal of triple (versus double) Higgs weak boson fusion

   Anisha🇬🇧 · Daniel Domenech🇪🇸 · Christoph Englert🇬🇧 · Maria J. Herrero🇪🇸 · Roberto A. Morales🇦🇷

   Multi-Higgs boson interactions with massive gauge bosons are known to be tell-tale probes of the vacuum manifold of electroweak symmetry breaking. Phenomenologically, a precise determination of these parameters is hampered through increasingly rare processes at the presently available energy frontier provided by the Large Hadron Collider. Contact interactions of three Higgs bosons with the $W$ and $Z$ bosons seem currently well out of experimental reach due to an irrelevant SM production cross section. From a theoretical perspective, in perturbative extensions of the SM such interactions are suppressed by weak loops and further diluted in a priori sensitive processes like weak boson fusion (WBF) when they admit a dimension-six Standard Model Effective Field Theory description. In this work, we identify scenarios that can indeed lead to large, and perhaps even observable modifications of WBF triple Higgs production most directly parametrised by Higgs Effective Field Theory. We critically analyse these enhancements at the LHC and future colliders from the perspective of unitarity and demonstrate the radiative stability of such analyses under QCD corrections at hadron colliders. Taking into account the restrictions from unitarity, we finally study the expected sensitivity to the electroweak triple Higgs production within HEFT, considering $HHVV$ and $HHHVV$ effective couplings, at both future hadron and lepton colliders. Particularly, we present numerical predictions for LHC, FCC, CLIC and muon colliders.

   hep-phhep-exPRD(2025)·13 citations
10. 10*

    Multi-$Z^{\prime }$ signatures of spontaneously broken local $U(1{)}^{\prime }$ symmetry

    Takaaki Nomura🇨🇳 · Kei Yagyu🇯🇵

    We discuss multi-$Z^{\prime }$ signatures coming from decays of Higgs bosons in models with a spontaneously broken $U(1{)}^{\prime }$ symmetry, which can be observed as "lepton jets" or multi-lepton final states depending on the mass range of new bosons. We consider anomaly-free $U(1{)}^{\prime }$ models without introducing new fermions except for right-handed neutrinos, in which the Higgs sector is composed of an isospin doublet and a singlet fields with zero and non-zero $U(1{)}^{\prime }$ charges, respectively. The multi-$Z^{\prime }$ signatures can then be obtained via the decays of the discovered (extra) Higgs boson $h$ ($\varphi$), i.e., $h\to Z^{\prime }{Z}^{\prime }$, $\varphi \to Z^{\prime }{Z}^{\prime }$ and/or $h\to \varphi \varphi \to 4Z^{\prime }$ as far as kinematically allowed. We give the upper limit on the branching ratios of $h$ into $Z^{\prime }{Z}^{\prime }$ and $4Z^{\prime }$ from the current experimental data in each model. We also show the deviation in the $hhh$ coupling from the standard model prediction at one-loop level, and find that its amount is typically smaller than 1\%.

    hep-phPRD(2025)·5 citations
11. 11*

    Dual origin of effective axion response

    Timur Z. Seidov🇷🇺 · Eduardo Barredo-Alamilla🇷🇺 · Daniel A. Bobylev🇷🇺 · Leon Shaposhnikov🇷🇺 · Maxim Mazanov🇷🇺 · Maxim A. Gorlach🇷🇺

    Effective axion fields in condensed matter and photonics are manifested as $\mathcal{P}$- and $\mathcal{T}$-odd contributions to the electromagnetic response. Here, we show that the phenomena previously attributed to the effective axion fields have two distinct physical origins. One of them corresponds to the standard axion electrodynamics, while another provides its dual-symmetric version having the same symmetry and featuring similar but distinguishable optical properties. We present an example system described by the dual-symmetric modification of axion electrodynamics, derive the key predictions and pinpoint experimentally observable distinctions between the two versions of axion-type response.

    hep-phcond-mat.mes-hallphysics.opticsNature Commun.(2025)·2 citations
12. 12*

    Two-photon decay of para-positronium within a composite approach

    Milena Piotrowska🇵🇱 · Francesco Giacosa🇵🇱

    The decay of the para-positronium into two photons is studied in the framework of a composite Quantum Field Theoretical approach. This amounts to the evaluation of the electron-positron dressing together with the Weinberg compositeness condition for the positronium and the triangle-shaped diagram with virtual electrons circulating in it, leading to the two-photon final state. An important role is played by the positronium-electron-positron vertex, which is linked to the wave function of the para-positronium. We show how possible choices for the vertex function affect the $\gamma \gamma$ decay rate. Outlooks to other decay channels and to other positronia are presented.

    hep-phActa Phys.Polon.A(2024)·2 citations
13. 13*

    Perturbative RGE systematics in precision observables

    Valerio Bertone🇫🇷 · Giuseppe Bozzi🇮🇹 · Francesco Hautmann🇧🇪

    QCD calculations for collider physics make use of perturbative solutions of renormalisation group equations (RGEs). Ambiguities related to these solutions can contribute significantly to systematic uncertainties of theoretical predictions for physical observables. We propose a general method to estimate these systematic effects using techniques inspired by soft-gluon and transverse-momentum resummation approaches. We first discuss the cases of the evolution of strong coupling ${\alpha }_s$, collinear parton-distribution functions (PDFs), and transverse-momentum-dependent distributions (TMDs). We then study the implications for precision observables in hadron-collider processes, such as the deep-inelastic scattering structure functions and the transverse-momentum distribution of the lepton pair in Drell-Yan production.

    hep-phPRD(2025)·5 citations
14. 14*

    System size dependence of energy loss and correlations of heavy mesons at LHC energies

    Jiaxing Zhao🇫🇷 · Joerg Aichelin🇫🇷 · Pol Bernard Gossiaux🇫🇷 · Klaus Werner🇫🇷

    We study the system size dependence of heavy quark (HQ) observables at a center of mass energy of $\sqrt{s_{\mathrm{NN}}}=5.02$ TeV to explore whether it can provide further constraints on the physical processes which are involved: energy loss of HQs in the quark gluon plasma (QGP), hadronization and hadronic rescattering. We use the EPOS4HQ approach to study p-p and 0-10\% central O-O, Ar-Ar, Kr-Kr and Pb-Pb reactions and investigate in detail the momentum change of heavy quarks from creation until their detection as part of a hadron as well as the enhancement of heavy baryon production at low $p_T$. We investigate furthermore the origin and the system size dependence of the azimuthal correlations between the heavy quark $Q$ and the heavy antiquark $\bar{Q}$ and how one can bypass the problem that correlations are washed out due to the combinatorial background. We conclude that a systematic study of the system size dependence of the momentum loss allows to separate the momentum loss due to the passage through the QGP from the momentum change due to hadronization and the $Q\bar{Q}$ correlations allow to gain inside into the different pQCD processes in which the heavy quarks are created.

    hep-phnucl-thPRC(2025)·12 citations
15. 15*

    Track signals at IceCube from subleading channels

    Reinaldo Francener🇧🇷 · Victor P. Goncalves🇧🇷 · Diego R. Gratieri🇧🇷

    Tracks events at the IceCube Observatory are characterized by an energetic muon crossing several kilometers before decaying. Such muons are dominantly produced in charged current (CC) muon neutrino - hadron interactions. However, muons are also produced through the $W$ - boson production and in the decay of tau leptons and heavy mesons created in neutral and charged current interactions induced by all neutrino flavors. In this paper, we investigate the contribution of these subleading channels to events characterized as tracks at the IceCube. Our results indicate that these channels correspond to a non - negligible fraction of the HESE track events. In addition, we show that its contributions are concentrated in muons that are less energetic than those arising from muonic neutrino CC interactions for the same visible energies of the process. Finally, we investigate the impact of these additional channels on the description of the astrophysical neutrino flux, and we find that the inclusion of these subleading processes are important in determining the parameters of the astrophysical neutrino flux.

    hep-phastro-ph.HEPRD(2024)·1 citation
16. 16*

    GeV scale dark matter and $B\to K+$ missing energy phenomenology in the $U(1{)}_{B-L}$ model

    Ajay Kumar Yadav🇮🇳 · Shivaramakrishna Singirala🇮🇳 · Manas Kumar Mohapatra🇮🇳 · Suchismita Sahoo🇮🇳

    We elucidate the recently observed discrepancy in the branching ratio of $B^{+}\to K^{+}$ +inv decay mode using a GeV scale scalar dark matter in an anomaly-free $U(1{)}_{B-L}$ gauge extension of the Standard Model. We constrain the new parameters by using consistency with the existing bounds on Dark matter relic density, direct detection, collider and BR($B\to K^{\ast }\nu \bar{\nu }$) measured at the Belle II experiment. We investigate couplings between the mediator and the SM fermions as well as the dark matter particle. We then estimate the branching ratios of $b\to s\nu \bar{\nu }$ decay processes such as $B\to (K^{+},K^{\ast })\nu \bar{\nu }$, $B_s\to (\eta ,{\eta }^{\prime })\nu \bar{\nu }$, $B_s\to \varphi \nu \bar{\nu }$ and $B_c\to (D_s,D_s^{\ast })\nu \bar{\nu }$ in a common parameter space, meeting the current experimental bounds of both sectors simultaneously.

    hep-phSpringer Proc.Phys.(2025)·0 citations
17. 17*

    Bayesian technique to combine independently-trained Machine-Learning models applied to direct dark matter detection

    David Cerdeno🇪🇸 · Martin de los Rios🇪🇸 · Andres D. Perez🇪🇸

    We carry out a Bayesian analysis of dark matter (DM) direct detection data to determine particle model parameters using the Truncated Marginal Neural Ratio Estimation (TMNRE) machine learning technique. TMNRE avoids an explicit calculation of the likelihood, which instead is estimated from simulated data, unlike in traditional Markov Chain Monte Carlo (MCMC) algorithms. This considerably speeds up, by several orders of magnitude, the computation of the posterior distributions, which allows to perform the Bayesian analysis of an otherwise computationally prohibitive number of benchmark points. In this article we demonstrate that, in the TMNRE framework, it is possible to include, combine, and remove different datasets in a modular fashion, which is fast and simple as there is no need to re-train the machine learning algorithm or to define a combined likelihood. In order to assess the performance of this method, we consider the case of WIMP DM with spin-dependent and independent interactions with protons and neutrons in a xenon experiment. After validating our results with MCMC, we employ the TMNRE procedure to determine the regions where the DM parameters can be reconstructed. Finally, we present CADDENA, a Python package that implements the modular Bayesian analysis of direct detection experiments described in this work.

    hep-phastro-ph.COphysics.data-anJCAP(2025)·3 citations
18. 18*

    Direct Detection of the Millicharged Background

    Ella Iles🇨🇦 · Saniya Heeba🇨🇦 · Katelin Schutz🇨🇦

    We show that dark matter direct detection experiments are sensitive to the existence of particles with a small effective charge (for instance, via couplings to a kinetically mixed, low-mass dark photon). Our forecasts do not depend on these particles comprising a significant fraction of the dark matter. Rather, these experiments are sensitive to the irreducible abundance produced in the early universe through the freeze-in mechanism. We find that ongoing and proposed direct detection experiments will have world-leading sensitivity to effective charges $Q\sim 10^{-12}$ across nine orders of magnitude in mass, corresponding to a dark matter sub-fraction as low as $\sim 10^{-3}$.

    hep-phastro-ph.COPRL(2025)·26 citations
19. 19*

    Electric Dipole Moments as indirect probes of Dark Sectors

    Marco Ardu🇪🇸 · Moinul Hossain Rahat🇪🇸 · Nicola Valori🇪🇸 · Oscar Vives🇪🇸

    Dark sectors provide beyond Standard Model scenarios which can address unresolved puzzles, such as the observed dark matter abundance or the baryon asymmetry of the Universe. A naturally small portal to the dark sector is obtained if dark-sector interactions stem from a non-Abelian hidden gauge group that couples through kinetic mixing with the hypercharge boson. In this work, we investigate the phenomenology of such a portal of dimension five in the presence of CP violation, focusing on its signatures in fermion electric dipole moments. We show that, currently unbounded regions of the parameter space from dark photon searches can be indirectly probed with upcoming electron dipole moment experiments for dark boson masses in the range $1-100$ GeV. We also discuss two particular scenarios where a $SU(2{)}_D$ dark gauge group spontaneously breaks into either an Abelian $U(1{)}_D$ or nothing. In both cases, we show that potentially observable electron dipole moments can be produced in vast regions of the parameter space compatible with current experimental constraints and observed dark matter abundance.

    hep-phJHEP(2024)·14 citations
20. 20*

    Quantum Field Theory and the Limits of Reductionism

    Emily Adlam🇺🇸

    I suggest that the current situation in quantum field theory (QFT) provides some reason to question the universal validity of ontological reductionism. I argue that the renormalization group flow is reversible except at fixed points, which makes the relation between large and small distance scales quite symmetric in QFT, opening up at least the technical possibility of a non-reductionist approach to QFT. I suggest that some conceptual problems encountered within QFT may potentially be mitigated by moving to an alternative picture in which it is no longer the case that the large supervenes on the small. Finally, I explore some specific models in which a form of non-reductionism might be implemented, and consider the prospects for future development of these models.

    ↳ physics.hist-phhep-phquant-phSynthese(2024)·0 citations
21. 21*

    Linear-Quadratic GUP and Thermodynamic Dimensional Reduction

    H. Ramezani🇮🇷 · K. Nozari🇮🇷

    In this paper we investigate the statistical mechanics within the Linear-Quadratic GUP (LQGUP, i.e, GUP with linear and quadratic terms in momentum) models in the semiclassical regime. Then, some thermodynamic properties of a system of 3-dimensional harmonic oscillators are investigated by calculating the deformed partition functions. According to the equipartition theorem, we show that the number of accessible microstates decreases sharply in the very high temperatures regime. When the thermal de Broglie wavelength is of the order of the Planck length, three degrees of freedom are frozen in this setup. In other words, it is observed that there is an effective reduction of the degrees of freedom from 6 to 3 for a system of 3D harmonic oscillators in this framework. The calculations are carried out using both approximate analytical and exact numerical methods. The results of the analytical method are also presented in the form of thermal wavelengths for better understanding. Finally, the case of a 2-dimensional harmonic is treated as another example to comprehend the results, leading to a reduction of the degrees of freedom from 4 to 2.

    ↳ gr-qchep-phhep-thAnnals Phys.(2024)·3 citations
22. 22*

    Inspecting neutrino flavor instabilities during proto-neutron star cooling phase in supernova: I. Spherically symmetric model

    Masamichi Zaizen🇯🇵 · Sherwood Richers🇺🇸 · Hiroki Nagakura🇯🇵 · Hideyuki Suzuki🇯🇵 · Chinami Kato🇯🇵

    In the standard model of core-collapse supernova (CCSN), all neutrinos are assumed to be in pure flavor eigenstates in CCSN cores, but the assumption becomes invalid if neutrino distributions are unstable to flavor conversions. In this paper, we present a study of the occurrences of two representative neutrino-flavor instabilities, fast- and collisional flavor instabilities, in the cooling phase of proto-neutron star (PNS) from 1- to 50 seconds. We follow the long-term evolution of a PNS under spherically symmetric and quasi-static approximations, in which the matter profile is determined by solving the Tolman-Oppenheimer-Volkoff equation with neutrino feedback under the treatment of multi-group flux limited diffusion. For the stability analysis of neutrino flavor conversions, we recompute neutrino distributions using Monte Carlo transport in order to obtain the full angular distribution needed to compute the dispersion relations. We find no signs of flavor conversions in our models; the physical reason is thoroughly investigated. We also argue that the negative conclusion in flavor conversions could be changed qualitatively if multi-dimensional effects are included, as similar to cases in the earlier phase of CCSN.

    ↳ astro-ph.HEhep-ph4 citations
23. 23*

    Timelike meson form-factors beyond the elastic region from lattice QCD

    Felipe Ortega-Gama🇺🇸 · Jozef Dudek🇺🇸 · Robert Edwards🇺🇸

    We present a calculation of the vector-isovector timelike form-factors of the pion and the kaon using lattice quantum chromodynamics. We calculate two-point correlation functions with $m_{\pi }\sim 280$ MeV, extracting both the finite-volume spectrum and matrix elements for these states created from the vacuum by a vector current. After determining the coupled-channel $\pi \pi ,K\overline{K}$ scattering amplitudes, we perform the necessary correction for the significant finite-volume effects present in the current matrix elements, leading to the timelike form-factors. We find these to be dominated by the presence of the $\rho$ resonance, and we extract its decay constant by an analytic continuation of the amplitudes to the resonance pole. In addition, the spacelike pion form-factor is determined on the same lattice configurations, and a dispersive parameterization is used to simultaneously describe the spacelike and elastic timelike regions.

    ↳ hep-lathep-phPRD(2024)·12 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.