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Nuclear Theory·nucl-th

Thursday·September 3, 2015

11 papers—8 primary·3 cross-listed

All11Primary8Cross-lists3
  1. 09

    [Submitted on 28 Aug 2015] (cross-list from hep-ph)

    Charmed Baryons Circa 2015

    Hai-Yang Cheng🇹🇼

    This is basically the update of [arXiv:0809.1869], a review on charmed baryon physics around 2007. Topics of this review include the spectroscopy, strong decays, lifetimes, nonleptonic and semileptonic weak decays, and electromagnetic decays of charmed baryons.

    Comments:
    39 pages, 7 figures. References added and Table XIV updated, to appear in Frontiers of Physics
    Subjects:
    High Energy Physics — Phenomenology (hep-ph); High Energy Physics — Experiment (hep-ex); High Energy Physics — Lattice (hep-lat); Nuclear Theory (nucl-th)
    arXiv:
    1508.07233 [pdf]
    19 citations
  2. 10

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

    The (magnetized) effective QCD phase diagram

    Alejandro Ayala🇿🇦

    I present the highlights of a recent study of the effective QCD phase diagram on the temperature T and quark chemical potential mu plane, where the strong interactions are modeled using the linear sigma model coupled to quarks. The phase transition line is found from the effective potential at finite T and mu taking into account the plasma screening effects. We find the location of the critical end point (CEP) to be (mu^CEP/T_c,T^CEP/T_c) \sim (1.2,0.8), where T_c is the (pseudo)critical temperature for the crossover phase transition at vanishing mu. This location lies within the region found by lattice inspired calculations. Since the linear sigma model does not exhibit confinement, I argue that the location is due to the proper treatment of the plasma screening effects and not to the size of the confining scale. I also comment on the extension of this study to determine the dependence of the CEP's location on the strength of an external magnetic field.

    Comments:
    5 pages, 1 figure. Talk given at 18th International Conference in Quantum Chromodynamics (QCD 15, 30th anniversary), 29 june - 3 july 2015, Montpellier - FR
    Subjects:
    High Energy Physics — Phenomenology (hep-ph); High Energy Physics — Lattice (hep-lat); Nuclear Theory (nucl-th)
    arXiv:
    1509.00663 [pdf]
    0 citations
  3. 11

    [Submitted on 2 Sept 2015] (cross-list from hep-lat)

    QED effects in the pseudoscalar meson sector

    R. Horsley🇬🇧 · Y. Nakamura🇯🇵 · H. Perlt🇩🇪 · D. Pleiter🇩🇪 · P. E. L. Rakow🇬🇧 · G. Schierholz🇩🇪 · A. Schiller🇩🇪 · R. Stokes🇦🇺 · H. Stüben🇩🇪 · R. D. Young🇦🇺 · J. M. Zanotti🇦🇺

    We present results on the pseudoscalar meson masses from a fully dynamical simulation of QCD+QED. We concentrate particularly on violations of isospin symmetry. We calculate the - splitting and also look at other isospin violating mass differences. We have presented results for these isospin splittings in arXiv:1508.06401 [hep-lat]. In this paper we give more details of the techniques employed, discussing in particular the question of how much of the symmetry violation is due to QCD, arising from the different masses of the and quarks, and how much is due to QED, arising from the different charges of the quarks. This decomposition is not unique, it depends on the renormalisation scheme and scale. We suggest a renormalisation scheme in which Dashen's theorem for neutral mesons holds, so that the electromagnetic self-energies of the neutral mesons are zero, and discuss how the self-energies change when we transform to a scheme such as , in which Dashen's theorem for neutral mesons is violated.

    Comments:
    22 pages, 7 figures. Replaced by version accepted for publication. One figure added, some discussions expanded. Conclusions unchanged
    Subjects:
    High Energy Physics — Lattice (hep-lat); High Energy Physics — Phenomenology (hep-ph); Nuclear Theory (nucl-th)
    arXiv:
    1509.00799 [pdf]
    JHEP(2016)·65 citations

Affiliations

first authorsco-authorsvia INSPIRE