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Nuclear Theory·nucl-th

Wednesday·April 5, 2023

13 papers—8 primary·5 cross-listed

All13Primary8Cross-lists5
  1. 09

    [Submitted on 3 Apr 2023] (cross-list from hep-th)

    Novel transition dynamics of topological solitons

    Kentaro Nishimura🇯🇵 · Noriyuki Sogabe🇺🇸

    Continuous phase transitions can be classified into ones characterized by local-order parameters and others that need additional topological constraints. The critical dynamics near the former transitions have been extensively studied, but the latter is less understood. We fill this gap in knowledge by studying the transition dynamics to a parity-breaking topological ground state called the chiral soliton lattice in quantum chromodynamics at finite temperature, baryon chemical potential, and external magnetic field. We find a slowing down of the soliton's translational motion as the critical magnetic field approaches while the local dissipation rate remains finite. Therefore, the characteristic time it takes to converge to the stationary state associated with a finite topological number strongly depends on the initial configuration: whether it forms a solitonic structure or not.

    Comments:
    8 pages, 4 figures; published version
    Subjects:
    High Energy Physics — Theory (hep-th); cond-mat.mtrl-sci (cond-mat.mtrl-sci); High Energy Physics — Phenomenology (hep-ph); Nuclear Theory (nucl-th)
    arXiv:
    2304.01264 [pdf]
    PRD(2024)·2 citations
  2. 10

    [Submitted on 4 Apr 2023] (cross-list from astro-ph.HE)

    The proto-neutron star inner crust in the liquid phase

    H. Dinh Thi🇫🇷 · A. F. Fantina🇫🇷 · F. Gulminelli🇫🇷

    The crust of a neutron star is known to melt at a temperature that increases with increasing matter density, up to about K. At such high temperatures and beyond, the crustal ions are put into collective motion and the associated entropy contribution can affect both the thermodynamic properties and the composition of matter. We studied the importance of this effect in different thermodynamic conditions relevant to the inner crust of the proto-neutron star, both at beta equilibrium and in the fixed-proton-fraction regime. To this aim, we solved the hydrodynamic equations for an ion moving in an incompressible, irrotational, and non-viscous fluid, with different boundary conditions, thus leading to different prescriptions for the ion effective mass. We then employed a compressible liquid-drop approach in the one-component plasma approximation, including the renormalisation of the ion mass to account for the influence of the surrounding medium. We show that the cluster size is determined by the competition between the ion centre-of-mass motion and the interface properties, namely the Coulomb, surface, and curvature energies. In particular, including the translational free energy in the minimisation procedure can significantly reduce the optimal number of nucleons in the clusters and lead to an early dissolution of clusters in dense beta-equilibrated matter. On the other hand, we find that the impact of translational motion is reduced in scenarios where the proton fraction is assumed constant and is almost negligible on the inner-crust equation of state. Our results show that the translational degrees of freedom affect the equilibrium composition of beta-equilibrated matter and the density and pressure of the crust-core transition in a non-negligible way, highlighting the importance of its inclusion when modelling the finite-temperature inner crust of the (proto-)neutron star.

    Comments:
    14 pages, 13 figures, accepted for publication in Astronomy and Astrophysics
    Subjects:
    High Energy Astrophysical Phenomena (astro-ph.HE); Nuclear Theory (nucl-th)
    arXiv:
    2304.01584 [pdf]
    Astron.Astrophys.(2023)·17 citations
  3. 11

    [Submitted on 4 Apr 2023] (cross-list from hep-ph)

    Anomalies in Particle Physics

    Andreas Crivellin🇨🇭

    I provide a (personal) review of the current hints for physics beyond the Standard Model, called ``anomalies'', obtained both at the intensity frontier (flavour and electroweak precision observables) and in direct LHC searches. This includes the deviations from the Standard Model predictions in semi-leptonic decays, the anomalous magnetic moment of the muon, the Cabibbo Angle Anomaly, the mass as well as non-resonant di-lepton searches, the hints for new scalar particles around GeV, GeV, GeV and the (di-)di-jet excess at TeV (TeV). Possible explanations in terms of new particles are briefly summarized and discussed.

    Comments:
    17 pages, 10 figures, proceedings for: 8 Symposium on Prospects in the Physics of Discrete Symmetries (DISCRETE 2022), 7-11 November 2022 Baden-Baden, Germany
    Subjects:
    High Energy Physics — Phenomenology (hep-ph); High Energy Physics — Experiment (hep-ex); High Energy Physics — Lattice (hep-lat); Nuclear Experiment (nucl-ex); Nuclear Theory (nucl-th)
    arXiv:
    2304.01694 [pdf]
    PoS(2024)·8 citations
  4. 12

    [Submitted on 4 Apr 2023] (cross-list from hep-ph)

    -Exchange Contributions in Low-Energy Parity-Violating Scattering

    Qian-Qian Guo🇨🇳 · Hai-Qing Zhou🇨🇳

    In this work, the -exchange contributions in the low-energy elastic parity-violating scattering are discussed with the approximation . By expanding the and interactions on the momentum of photon and considering both the leading-order and the next-to-leading order interactions, we calculate the amplitudes of the -exchange diagrams. After performing the loop integral, we expand the results in the low energy limit, and obtain the analytic expressions for the amplitudes. Numerical comparisons show that the analytic expressions are very close to the full results over a large region. We investigate the power behaviors of these contributions and find that some are enhanced by a kinematic factor in the low energy limit. Additionally, in some cases, the imaginary parts of the contributions from the next-to-leading-order interactions are at the same order as those from the leading-order interactions. Furthermore, the corresponding contributions to the physical observable quantity are also discussed. Combining all the properties together, we conclude that these analytic expressions describe the leading-order contributions of all -exchange helicity amplitudes in the region with , where is the fine structure constant, is the mass of proton, and are the small quantities related to the momentum transfer and the center-of-mass energy.

    Subjects:
    High Energy Physics — Phenomenology (hep-ph); High Energy Physics — Experiment (hep-ex); Nuclear Experiment (nucl-ex); Nuclear Theory (nucl-th)
    arXiv:
    2304.01813 [pdf]
    PRC(2023)·3 citations
  5. 13

    [Submitted on 20 Feb 2023] (cross-list from hep-ex)

    New model comparison for semi-inclusive charged-current electron and muon neutrino scattering by Ar in the energy range of the MicroBooNE experiment

    J. M. Franco-Patino🇪🇸 · S. Dolan🇨🇭 · R. González-Jiménez🇪🇸 · M.B. Barbaro🇮🇹 · J.A. Caballero🇪🇸 · G.D. Megias🇪🇸

    In this work we present a comparison of semi-inclusive muon and electron neutrino cross sections with Ar target measured by the MicroBooNE Collaboration with the predictions of an unfactorized model based on the relativistic distorted wave impulse approximation (RDWIA) and the SuSAv2-MEC model implemented in the neutrino event generator GENIE. The predictions based on the RDWIA approach, with a realistic description of the initial state and a phenomenological relativistic complex optical potential for the description of final state interactions, better describe the measured cross sections than GENIE-SuSAv2 and RDWIA with a purely real potential.

    Subjects:
    High Energy Physics — Experiment (hep-ex); Nuclear Theory (nucl-th)
    arXiv:
    2304.01916 [pdf]
    PRD(2024)·25 citations

Affiliations

first authorsco-authorsvia INSPIRE