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Nuclear Theory·nucl-th

Thursday·April 8, 2021

9 papers—5 primary·4 cross-listed

All9Primary5Cross-lists4
  1. 06

    Exploring the flavor content of light and heavy-light pseudoscalars

    R. M. Moita (Instituto Tecnológico de Aeronáutica, DCTA, São José dos Campos, Brazil)🇧🇷 · J. P. B. C. de Melo (Laboratório de Física Teórica e Computacional - LFTC - UCS/UNICID São Paulo, Brazil)🇧🇷 · K. Tsushima (Laboratório de Física Teórica e Computacional - LFTC - UCS/UNICID- São Paulo, Brazil)🇧🇷 · T. Frederico (Instituto Tecnológico de Aeronáutica, DCTA, São José dos Campos, Brazil)🇧🇷

    The electroweak properties of light and charmed D and Ds pseudoscalar mesons are investigated within a unified covariant constituent quark model. The quark-antiquark-meson vertices are assumed to have a symmetric form by the exchange of quark momenta, which is successful in describing the light pseudoscalar meson properties. The flavor decomposition of the elastic electromagnetic form factors, electromagnetic charge radii, and weak decay constants are calculated. Based on the results a discussion on the SU(3) and SU(4) symmetry breaking is made and a comparison with the pion and kaon properties to highlight the Higgs contribution to the structure of these mesons.

    ↳ hep-phnucl-thPRD(2021)·13 citations
  2. 07

    Gravo-thermal catastrophe in gravitational collapse and energy progenitor of Gamma-Ray Bursts

    She-Sheng Xue🇮🇹

    We study the homologous collapse of stellar nuclear core, the virial theorem for hadron collisional relaxations, and photon productions from hadron collisions. We thus show the gravo-thermal dynamical process that transforms gravitational energy to photon energy. The process is energetically and entropically favourable. The total baryon number conservation, Euler equation for energy-momentum conservation and Poisson's equation for gravitational potential are adopted to describe homologous core collapses. The virial theorem determines the hadron collision energy gain from gravitational potential. The hadronic photon production rate determines the photon energy density. The time scales of macroscopic and microscopic processes are studied to verify approximations. As a result, we show the formation of opaque photon-pair spheres, whose total energy, size, temperature and number density, accounting for the main energetic features of Gamma-Ray Burst progenitors. We obtain the intrinsic correlations of these quantities. They depend only on the averaged thermal index of the stellar core. We discuss the possibility to confront them with observational data.

    ↳ astro-ph.HEnucl-thphysics.plasm-phJCAP(2021)·5 citations
  3. 08

    Axial-vector nucleon-to-delta transition form factors using the complex-mass renormalization scheme

    Y. Ünal🇹🇷 · A. Küçükarslan🇹🇷 · S. Scherer🇩🇪

    We investigate the axial-vector nucleon-to-delta transition form factors in the framework of relativistic baryon chiral perturbation theory at the one-loop order using the complex-mass renormalization scheme. We determine the available six free parameters by fitting to an empirical parametrization of the form factors obtained from the BNL neutrino bubble chamber experiments. A unique feature of our calculation is the prediction of a non-vanishing form factor . Moreover, our results show a surprising sensitivity to the coupling constant of the leading-order Lagrangian .

    ↳ hep-phnucl-thPRD(2021)·12 citations
  4. 09

    Genuine empirical pressure within the proton

    Adam Freese🇺🇸 · Gerald A. Miller🇺🇸

    A phenomenological extraction of pressure within the proton has recently been performed using JLab CLAS data (arXiv:2104.02031 [nucl-ex]). The extraction used a 3-dimensional Breit frame description in which the initial and final proton states have different momenta. Instead, we obtain the two-dimensional transverse light front pressure densities that incorporate relativistic effects arising from the boosts that cause the initial and final states to differ. The mechanical radius is then determined to be , which is smaller than the electric charge radius and larger than the light front momentum radius. The forces within the proton are shown to be predominantly repulsive at distances less than from the center, and predominantly attractive further out.

    ↳ hep-phnucl-exnucl-thPRD(2021)·30 citations

Affiliations

first authorsco-authorsvia INSPIRE