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Nuclear Theory·nucl-th

Thursday·July 15, 2021

6 papers—4 primary·2 cross-listed

All6Primary4Cross-lists2
  1. 05

    [Submitted on 14 Jul 2021] (cross-list from hep-ph)

    Progress and Opportunities in Backward angle (u-channel) Physics

    C. Ayerbe Gayoso🇺🇸 · Ł. Bibrzycki🇵🇱 · S. Diehl🇩🇪 · S. Heppelmann🇺🇸 · D.W. Higinbotham🇺🇸 · G.M. Huber🇨🇦 · S.J.D. Kay🇨🇦 · S.R. Klein🇺🇸 · J.M. Laget🇺🇸 · W.B. Li🇺🇸 · V. Mathieu🇪🇸 · K. Park🇺🇸 and 8 other authors

    Backward angle (u-channel) scattering provides complementary information for studies of hadron spectroscopy and structure, but has been less comprehensively studied than the corresponding forward angle case. As a result, the physics of u-channel scattering poses a range of new experimental and theoretical opportunities and questions. We summarize recent progress in measuring and understanding high energy reactions with baryon charge exchange in the u-channel, as discussed in the first backward angle (u-channel) Physics Workshop. In particular, we discuss backward angle measurements and their theoretical description via both hadronic models and the collinear factorization approach, and discuss planned future measurements of u-channel physics. Finally, we propose outstanding questions and challenges for u-channel physics.

    Subjects:
    High Energy Physics — Phenomenology (hep-ph); Nuclear Experiment (nucl-ex); Nuclear Theory (nucl-th)
    arXiv:
    2107.06748 [pdf]
    EPJA(2021)·22 citations
  2. 06

    [Submitted on 14 Jul 2021] (cross-list from astro-ph.HE)

    Impact of the nuclear symmetry energy on the post-merger phase of a binary neutron star coalescence

    Elias R. Most · Carolyn A. Raithel

    The nuclear symmetry energy plays a key role in determining the equation of state of dense, neutron-rich matter, which governs the properties of both terrestrial nuclear matter as well as astrophysical neutron stars. A recent measurement of the neutron skin thickness from the PREX collaboration has lead to new constraints on the slope of the nuclear symmetry energy, L, which can be directly compared to inferences from gravitational-wave observations of the first binary neutron star merger inspiral, GW170817 In this paper, we explore a new regime for potentially constraining the slope, L, of the nuclear symmetry energy with future gravitational wave events: the post-merger phase a binary neutron star coalescence. In particular, we go beyond the inspiral phase, where imprints of the slope parameter L may be inferred from measurements of the tidal deformability, to consider imprints on the post-merger dynamics, gravitational wave emission, and dynamical mass ejection. To this end, we perform a set of targeted neutron star merger simulations in full general relativity using new finite-temperature equations of state, which systematically vary L. We find that the post-merger dynamics and gravitational wave emission are mostly insensitive to the slope of the nuclear symmetry energy. In contrast, we find that dynamical mass ejection contains a weak imprint of L, with large values of L leading to systematically enhanced ejecta.

    Comments:
    23 pages, 14 figures. Equal contribution
    Subjects:
    High Energy Astrophysical Phenomena (astro-ph.HE); General Relativity and Quantum Cosmology (gr-qc); Nuclear Theory (nucl-th)
    arXiv:
    2107.06804 [pdf]
    PRD(2021)·67 citations

Affiliations

first authorsco-authorsvia INSPIRE