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Nuclear Theory·nucl-th

Wednesday·February 24, 2016

9 papers—6 primary·3 cross-listed

All9Primary6Cross-lists3
  1. 07

    [Submitted on 21 Feb 2016] (cross-list from hep-ph)

    Inverse Magnetic Catalysis in Nambu--Jona-Lasinio Model beyond Mean Field

    Shijun Mao🇨🇳

    We study inverse magnetic catalysis in the Nambu--Jona-Lasinio model beyond mean field approximation. The feed-down from mesons to quarks is embedded in an effective coupling constant at finite temperature and magnetic field. While the magnetic catalysis is still the dominant effect at low temperature, the meson dressed quark mass drops down with increasing magnetic field at high temperature due to the dimension reduction of the Goldstone mode in the Pauli-Villars regularization scheme.

    Comments:
    7 pages, 4 figures
    Subjects:
    High Energy Physics — Phenomenology (hep-ph); High Energy Physics — Theory (hep-th)
    arXiv:
    1602.06503 [pdf]
    PLB(2016)·98 citations
  2. 08

    [Submitted on 23 Feb 2016] (cross-list from hep-ph)

    Understanding the nature of the heavy pentaquarks and searching for them in pion-induced reactions

    Xiao-Hai Liu🇯🇵 · Makoto Oka🇯🇵

    We investigate the reaction via the open-charm hadron rescattering diagrams. Due to the presence of the triangle singularity (TS) in the rescattering amplitudes, the TS peaks can simulate the pentaquark-like resonances arising in the invariant mass distributions, which may bring ambiguities on our understanding of the nature of the exotic states. Searching for the heavy pentaquark in different processes may help us to clarify the ambiguities, because of the highly process-dependent characteristic of the TS mechanism.

    Comments:
    15 pages, 3 figures, 4 tables
    Subjects:
    High Energy Physics — Phenomenology (hep-ph); High Energy Physics — Experiment (hep-ex); Nuclear Experiment (nucl-ex); Nuclear Theory (nucl-th)
    arXiv:
    1602.07069 [pdf]
    NPA(2016)·39 citations
  3. 09

    [Submitted on 23 Feb 2016] (cross-list from nucl-ex)

    Evolution of fusion hindrance for asymmetric systems at deep sub barrier energies

    A. Shrivastavaa🇮🇳 · K. Mahata🇮🇳 · S.K. Pandit🇮🇳 · V. Nanal🇮🇳 · T. Ichikawa🇯🇵 · K. Hagino🇯🇵 · A. Navin🇫🇷 · C.S. Palshetkar🇮🇳 · V.V. Parkar🇮🇳 · K. Ramachandran🇮🇳 · P.C. Rout🇮🇳 · Abhinav Kumar🇮🇳 · A. Chatterjee🇮🇳 · S. Kailas🇮🇳

    Measurements of fusion cross-sections of 7Li and 12C with 198Pt at deep sub-barrier energies are reported to unravel the role of the entrance channel in the occurrence of fusion hindrance. The onset of fusion hindrance has been clearly observed in 12C + 198Pt system but not in 7Li + 198Pt system, within the measured energy range. Emergence of the hindrance, moving from lighter (6,7Li) to heavier (12C,16O) projectiles is explained employing a model that considers a gradual transition from a sudden to adiabatic regime at low energies. The model calculation reveals a weak effect of the damping of coupling to collective motion for the present systems as compared to that obtained for systems with heavier projectiles.

    Comments:
    Accepted in Phys. Letts. B
    Subjects:
    Nuclear Experiment (nucl-ex); Nuclear Theory (nucl-th)
    arXiv:
    1602.07095 [pdf]
    PLB(2016)·32 citations

Affiliations

first authorsco-authorsvia INSPIRE