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Nuclear Theory·nucl-th

Monday·August 9, 2021

4 papers—2 primary·2 cross-listed

All4Primary2Cross-lists2
  1. 03

    [Submitted on 5 Aug 2021] (cross-list from hep-ph)

    Threshold Upsilon-meson Photoproduction at EIC and EicC

    Igor I. Strakovsky (GW)🇺🇸 · William J. Briscoe (GW)🇺🇸 · Lubomir Pentchev (JLab)🇺🇸 · Axel Schmidt (GW)🇺🇸

    High-accuracy -meson photoproduction data from EIC and EicC experiments will allow the measurement of the near-threshold total cross section of the reaction , from which the absolute value of the scattering length, , can be extracted using a Vector-Meson Dominance model. For this evaluation, we used -meson photoproduction quasi-data from the QCD approach (the production amplitude can be factorized in terms of gluonic generalized parton distributions and the quarkonium distribution amplitude). A comparative analysis of with the recently determined scattering lengths for , , and using the A2, CLAS, and GlueX experimental data are performed. The role of the "young" vector-meson effect is evaluated.

    Comments:
    6 pages, 6 figures, 3 tables
    Subjects:
    High Energy Physics — Phenomenology (hep-ph); High Energy Physics — Experiment (hep-ex); Nuclear Experiment (nucl-ex); Nuclear Theory (nucl-th)
    arXiv:
    2108.02871 [pdf]
    PRD(2021)·28 citations
  2. 04

    [Submitted on 6 Aug 2021] (cross-list from astro-ph.HE)

    Observing Supernova Neutrino Light Curves with Super-Kamiokande. II. Impact of the Nuclear Equation of State

    Ken'ichiro Nakazato🇯🇵 · Fumi Nakanishi🇯🇵 · Masayuki Harada🇯🇵 · Yusuke Koshio🇯🇵 · Yudai Suwa🇯🇵 · Kohsuke Sumiyoshi🇯🇵 · Akira Harada🇯🇵 · Masamitsu Mori🇯🇵 · Roger A. Wendell🇯🇵

    The late-time evolution of the neutrino event rate from supernovae is evaluated for Super-Kamiokande using simulated results of proto-neutron star (PNS) cooling. In the present work we extend the result of Suwa et al. (2019) [arXiv:1904.09996], which studied the dependence on the PNS mass, but focus on the impact of the nuclear equation of state (EOS). We find that the neutrino event rate depends on both the high-density and low-density EOS, where the former determines the radius of the PNS and the latter affects its surface temperature. Based on the present evaluation of the neutrino event rate we propose a new analysis method to extract the time variability of the neutrino average energy taking into account the statistical error in the observation.

    Comments:
    22 pages, 15 figures, accepted for publication in ApJ. The supernova neutrino data computed in this study are available at https://doi.org/10.5281/zenodo.5778223
    Subjects:
    High Energy Astrophysical Phenomena (astro-ph.HE); Solar and Stellar Astrophysics (astro-ph.SR); High Energy Physics — Phenomenology (hep-ph); Nuclear Theory (nucl-th)
    arXiv:
    2108.03009 [pdf]
    ApJ(2022)·30 citations

Affiliations

first authorsco-authorsvia INSPIRE