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Nuclear Theory·nucl-th

Friday·April 3, 2015

6 papers—4 primary·2 cross-listed

All6Primary4Cross-lists2
  1. 05

    [Submitted on 2 Apr 2015] (cross-list from astro-ph.SR)

    Exotic Phases in Magnetars

    S. Schramm🇩🇪 · A. Bhattacharyya🇮🇳 · V. Dexheimer🇺🇸 · R. Mallick🇩🇪

    Neutron stars feature extremely high magnetic fields with deduced field strengths of G in the case of magnetars and potentially much higher values inside of the star. In this context we consider the appearance of meson condensation taking into account the effect of the magnetic field. The results show that, depending on parameters, such a condensation in magnetized neutron stars might (just) occur.

    Comments:
    Contribution to the Proceedings of CSQCD IV, Prerow (2014)
    Subjects:
    Solar and Stellar Astrophysics (astro-ph.SR); Nuclear Theory (nucl-th)
    arXiv:
    1504.00451 [pdf]
    1 citation
  2. 06

    [Submitted on 2 Apr 2015] (cross-list from hep-ph)

    Sequential Regeneration of Charmonia in Heavy-Ion Collisions

    Xiaojian Du🇺🇸 · Ralf Rapp🇺🇸

    We investigate the production of psi(2S) in nuclear collisions at RHIC and LHC energies. We first address charmonium production in 200 GeV d-Au collisions at RHIC; the strong suppression of psi' mesons observed in these reactions indicates mechanisms beyond initial cold nuclear matter effects. We find that a more complete treatment of hadronic dissociation reactions leads to appreciable psi' suppression in the hadronic medium of an expanding fireball background for d-Au collisions. When implementing the updated hadronic reaction rates into a fireball for 2.76 TeV Pb-Pb collisions at LHC, the regeneration of psi' mesons occurs significantly later than for J/psi's. Despite a smaller total number of regenerated psi', the stronger radial flow at their time of production induces a marked enhancement of their R_{AA} relative to J/psi's in a momentum range p_t \simeq 3-6 GeV. We explore the consequences and uncertainties of this "sequential regeneration" mechanism on the R_{AA} double ratio and find that it can reproduce the trends observed in recent CMS data.

    Comments:
    7 pages, 7 figures
    Subjects:
    High Energy Physics — Phenomenology (hep-ph); Nuclear Experiment (nucl-ex); Nuclear Theory (nucl-th)
    arXiv:
    1504.00670 [pdf]
    NPA(2015)·227 citations

Affiliations

first authorsco-authorsvia INSPIRE