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Nuclear Theory·nucl-th

Thursday·January 26, 2017

5 papers—2 primary·3 cross-listed

All5Primary2Cross-lists3
  1. 03

    [Submitted on 25 Jan 2017] (cross-list from hep-ph)

    Novel scenario for production of heavy flavored mesons in heavy ion collisions

    B.Z. Kopeliovich🇨🇱 · J. Nemchik🇸🇰 · I.K. Potashnikova🇨🇱 · Ivan Schmidt🇨🇱

    The observed strong suppression of heavy flavored hadrons produced with high , is caused by final state interactions with the created dense medium. Vacuum radiation of high-pT heavy quarks ceases at a short time scale, as is confirmed by pQCD calculations and by LEP measurements of the fragmentation functions of heavy quarks. Production of a heavy flavored hadrons in a dense medium is considerably delayed due to prompt breakup of the hadrons by the medium. This causes a strong suppression of the heavy quark yield because of the specific shape of the fragmentation function. The parameter-free description is in a good accord with available data.

    Comments:
    10 pages, 10 figures. Invited talk presented by BZK at the 5th International Conference on New Frontiers in Physics, Crete, 6-14 July 2016
    Subjects:
    High Energy Physics — Phenomenology (hep-ph); Nuclear Theory (nucl-th)
    arXiv:
    1701.07121 [pdf]
    EPJ Web Conf.(2017)·6 citations
  2. 04

    [Submitted on 25 Jan 2017] (cross-list from hep-ph)

    Flavor analysis of nucleon, , and hyperon electromagnetic form factors

    Martin Rohrmoser🇫🇷 · Ki-Seok Choi🇰🇷 · Willibald Plessas🇦🇹

    By the analysis of the world data base of elastic electron scattering on the proton and the neutron (for the latter, in fact, on and ) important experimental insights have recently been gained into the flavor compositions of nucleon electromagnetic form factors. We report on testing the Graz Goldstone-boson-exchange relativistic constituent-quark model in comparison to the flavor contents in low-energy nucleons, as revealed from electron-scattering phenomenology. It is found that a satisfactory agreement is achieved between theory and experiment for momentum transfers up to 4 GeV, relying on three-quark configurations only. Analogous studies have been extended to the and the hyperon electromagnetic form factors. For them we here show only some sample results in comparison to data from lattice quantum chromodynamics.

    Subjects:
    High Energy Physics — Phenomenology (hep-ph); Nuclear Theory (nucl-th)
    arXiv:
    1701.07337 [pdf]
    Few Body Syst.(2017)·1 citation
  3. 05

    [Submitted on 24 Jan 2017] (cross-list from astro-ph.HE)

    Quark Deconfinement in Rotating Neutron Stars

    R. D. Mellinger🇺🇸 · F. Weber🇺🇸 · W. Spinella🇺🇸 · G. A. Contrera🇺🇸 · M. G. Orsaria🇦🇷

    In this paper, we use a three flavor non-local Nambu--Jona-Lasinio (NJL) model, an~improved effective model of Quantum Chromodynamics (QCD) at low energies, to investigate the existence of deconfined quarks in the cores of neutron stars. Particular emphasis is put on the possible existence of quark matter in the cores of rotating neutron stars (pulsars). In contrast to non-rotating neutron stars, whose particle compositions do not change with time (are frozen in), the type and structure of the matter in the cores of rotating neutron stars depends on the spin frequencies of these stars, which opens up a possible new window on the nature of matter deep in the cores of neutron stars. Our study shows that, depending on mass and rotational frequency, up to around 8% of the mass of a massive neutron star may be in the mixed quark-hadron phase, if the phase transition is treated as a Gibbs transition. We also find that the gravitational mass at which quark deconfinement occurs in rotating neutron stars varies quadratically with spin frequency, which can be fitted by a simple formula.

    Comments:
    16 pages, 6 figures
    Subjects:
    High Energy Astrophysical Phenomena (astro-ph.HE); High Energy Physics — Phenomenology (hep-ph); Nuclear Theory (nucl-th)
    arXiv:
    1701.07343 [pdf]
    Universe(2017)·21 citations

Affiliations

first authorsco-authorsvia INSPIRE