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Nuclear Theory·nucl-th

Thursday·December 17, 2015

12 papers—4 primary·8 cross-listed

All12Primary4Cross-lists8
  1. 01

    [Submitted on 16 Dec 2015]

    Fluctuations of conserved charges in relativistic heavy ion collisions: An introduction

    Masayuki Asakawa🇯🇵 · Masakiyo Kitazawa🇯🇵

    Bulk fluctuations of conserved charges measured by event-by-event analysis in relativistic heavy ion collisions are observables which are believed to carry significant amount of information on the hot medium created by the collisions. Active studies have been done recently experimentally, theoretically, and on the lattice. In particular, non-Gaussianity of the fluctuations has acquired much attention recently. In this review, we give a pedagogical introduction to these issues, and survey recent developments in this field of research. Starting from the definition of cumulants, basic concepts in fluctuation physics, such as thermal fluctuations in statistical mechanics and time evolution of fluctuations in diffusive systems, are described. Phenomena which are expected to occur in finite temperature and/or density QCD matter and their measurement by event-by-event analyses are also elucidated.

    Comments:
    review article accepted for publication in Progress in Particle and Nuclear Physics, many minor changes, 62 pages, many figures
    Subjects:
    Nuclear Theory (nucl-th); High Energy Physics — Phenomenology (hep-ph); Nuclear Experiment (nucl-ex)
    arXiv:
    1512.05038 [pdf]
    PPNP(2016)·166 citations
  2. 02

    [Submitted on 16 Dec 2015]

    Electromagnetic selection rules in the triangular alpha-cluster model of 12C

    G.Stellin · L.Fortunato · A.Vitturi

    After recapitulating the procedure to find the bands and the states occurring in the alpha-cluster model of C in which the clusters are placed at the vertexes of an equilateral triangle, we obtain the selection rules for electromagnetic transitions. While the alpha cluster structure leads to the cancellation of E1 transitions, the approximations carried out in deriving the roto-vibrational hamiltonian lead to the disappearance of M1 transitions. Furthermore, although in general the lowest active modes are E2, E3, and M2, M3, , the cancellation of M2, M3 and M5 transitions between certain bands also occurs, as a result of the application of group theoretical techniques drawn from molecular physics. These implications can be very relevant for the spectroscopic analysis of -ray spectra of C.

    Subjects:
    Nuclear Theory (nucl-th); Nuclear Experiment (nucl-ex); physics.atm-clus (physics.atm-clus)
    arXiv:
    1512.05123 [pdf]
    J.Phys.G(2016)·16 citations
  3. 03

    [Submitted on 16 Dec 2015]

    Coexistence of Kaon Condensation and Hyperons in Hadronic Matter and Its Relevance to Quark Matter

    Takumi Muto🇯🇵 · Toshiki Maruyama🇯🇵 · Toshitaka Tatsumi🇯🇵

    Coexistence of kaon condensation and hyperons, which may be realized in neutron stars, is investigated on the basis of the relativistic mean-field theory combined with the effective chiral Lagrangian. It is shown that kaon-condensed phase in hyperon-mixed matter is plausible, but it leads to significant softening of the equation of state (EOS).We discuss indispensable effects which make the EOS stiffer so as to be consistent with recent neutron-star observations.

    Comments:
    3 pages, one figure, Proceedings of Quarks and Compact Stars, KIAA at Peking University, Beijing, China Oct. 20-22, 2014
    Subjects:
    Nuclear Theory (nucl-th)
    arXiv:
    1512.05137 [pdf]
    Acta Astron.Sin.Suppl.(2015)·0 citations
  4. 04

    [Submitted on 16 Dec 2015]

    The sensitivity of R_pA to color recombination effects

    Korinna Christina Zapp🇨🇭 · Guilherme Milhano🇨🇭 · Urs Achim Wiedemann🇨🇭

    In hadronization models with color recombination, partons are allowed to regroup into color singlet structures that are different from those determined by the perturbative parton shower. This aims at modeling the possibility that soft interactions of partons with the underlying event can change color connections. If such an effect is at play in proton-proton collisions, it may be expected to be enhanced in proton-nucleus collisions due to the higher color charge density in the underlying event. Here, we provide a qualitative argument that color recombination effects could lead to a multiplicity dependent hardening of single inclusive hadron spectra that dies out very weakly with increasing transverse momentum. We present results of a (conservative) model implementation in the cluster hadronization model of the SHERPA event generator. In this model, we find that color recombination effects harden indeed the single inclusive hadron spectra without affecting the jet spectra, but that this effect does not depend significantly on underlying event activity. We explain this model feature and we argue why, in general, data on proton-nucleus collisions can help to constrain hadronization models used in proton-proton event generators.

    Comments:
    Proceedings of the 25th Quark Matter Conference, 4 pages, 4 figures
    Subjects:
    Nuclear Theory (nucl-th); High Energy Physics — Phenomenology (hep-ph)
    arXiv:
    1512.05196 [pdf]
    NPA(2016)·0 citations

Affiliations

first authorsco-authorsvia INSPIRE