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Nuclear Theory·nucl-th

Friday·December 11, 2020

5 papers—2 primary·3 cross-listed

All5Primary2Cross-lists3
  1. 01

    [Submitted on 9 Dec 2020]

    Partial decay widths of baryons in the spin-momentum operator expansion method

    A.V. Sarantsev🇩🇪

    The covariant operator expansion method used by the Bonn-Gatchina group for the analysis of the meson photoproduction data is extended on the case of meson electro-production reactions. The angular dependence of the partial waves is deduced and the obtained amplitudes are compared with those used in other analyses of the electro-production reactions

    Comments:
    8 pages. arXiv admin note: text overlap with arXiv:hep-ph/0605135
    Subjects:
    Nuclear Theory (nucl-th); High Energy Physics — Phenomenology (hep-ph)
    arXiv:
    2012.05305 [pdf]
    0 citations
  2. 02

    [Submitted on 10 Dec 2020]

    In-medium effects in strangeness production in heavy-ion collisions at (sub-)threshold energies

    Taesoo Song🇩🇪 · Laura Tolos🇪🇸 · Joana Wirth🇩🇪 · Joerg Aichelin🇫🇷 · Elena Bratkovskaya🇩🇪

    We study the in-medium effects in strangeness production in heavy-ion collisions at (sub-)\-threshold energies of 1 - 2 A GeV based on the microscopic Parton-Hadron-String Dynamics (PHSD) transport approach. The in-medium modifications of the antikaon properties are described via the self-consistent coupled-channel unitarized scheme based on a SU(3) chiral Lagrangian which incorporates explicitly the and waves of the kaon-nucleon interaction. This scheme provides the antikaon potential, spectral functions and reaction cross sections as well as their dependence on baryon density, temperature and antikaon momentum in the nuclear medium, which are incorporated in the off-shell dynamics of the PHSD. The in-medium modification of kaons are accounted via the kaon-nuclear potential, which is assumed to be proportional to the local baryon density. The manifestation of the medium effects in observables is investigated for the and rapidity distributions, -spectra as well as the polar and azimuthal angular distributions, direct () and elliptic () flow in C+C, Ni+Ni, and Au+Au collisions. We find - by comparison to experimental data from the KaoS, FOPI and HADES Collaborations - that the modifications of (anti)kaon properties in nuclear matter are necessary to explain the data in a consistent manner. Moreover, we demonstrate the sensitivity of kaon observables to the equation-of-state of nuclear matter.

    Comments:
    38 pages, 26 figures, to be published in PRC
    Subjects:
    Nuclear Theory (nucl-th); Nuclear Experiment (nucl-ex)
    arXiv:
    2012.05589 [pdf]
    PRC(2021)·51 citations

Affiliations

first authorsco-authorsvia INSPIRE