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Nuclear Theory·nucl-th

Monday·June 17, 2024

9 papers—7 primary·2 cross-listed

All9Primary7Cross-lists2
  1. 08

    [Submitted on 14 Jun 2024] (cross-list from hep-ph)

    Bridging Electromagnetic and Gravitational Form Factors: Insights from LFHQCD

    Xiaobin Wang🇨🇳 · Zanbin Xing🇨🇳 · Minghui Ding🇩🇪 · Khépani Raya🇪🇸 · Lei Chang🇨🇳

    We propose an efficacious approach to derive the generalized parton distributions for the pion and proton, based upon prior knowledge of their respective parton distribution functions (PDFs). Our method leverages on integral representations of the electromagnetic form factors derived from the light-front holographic QCD (LFHQCD) formalism, coupled with PDFs computed from continuum Schwinger functional methods at the hadronic scale. Using these techniques, we calculate gravitational form factors and associated mass distributions for each hadron. Remarkably, our calculations yield results that closely match recent lattice QCD simulations conducted near the physical pion mass. This work not only deepens our understanding of hadronic structure but also highlights the efficacy of the LFHQCD approach in modeling fundamental properties of hadrons.

    Comments:
    6 pages, 5 figures
    Subjects:
    High Energy Physics — Phenomenology (hep-ph); Nuclear Theory (nucl-th)
    arXiv:
    2406.09644 [pdf]
    8 citations
  2. 09

    [Submitted on 14 Jun 2024] (cross-list from hep-ph)

    Steady state, displacement current and spin polarization for massless fermion in a shear flow

    Shu Lin🇨🇳 · Ziyue Wang🇨🇳

    We consider spin polarization of massless fermions in a shear flow, whose complete contributions contain magnetization current and side-jump current known from collisional chiral kinetic theory. We argue that the side-jump current adopts interpretation of displacement current. We explicitly determine the displacement current contribution in the steady state reached in shear flow for a QED plasma. We find the displacement contribution enhances the magnetization contribution at small and large momenta, but leads to a suppression effect at intermediate momenta. Major differences from previous studies on collisional effect are: (i) the fermions are in the same steady state as the medium rather than being probes; (ii) Compton scattering and pair annihilation are also included in addition to the Coulomb scattering considered before.

    Comments:
    20 pages, 4 figures
    Subjects:
    High Energy Physics — Phenomenology (hep-ph); Nuclear Experiment (nucl-ex); Nuclear Theory (nucl-th)
    arXiv:
    2406.10003 [pdf]
    PRD(2025)·18 citations

Affiliations

first authorsco-authorsvia INSPIRE