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Nuclear Theory·nucl-th

Friday·May 1, 2015

8 papers—4 primary·4 cross-listed

All8Primary4Cross-lists4
  1. 01

    [Submitted on 29 Apr 2015]

    Thermal photon radiation in high multiplicity p+Pb collisions at the Large Hadron Collider

    C. Shen🇨🇦 · J.-F. Paquet🇨🇦 · G. S. Denicol🇨🇦 · S. Jeon🇨🇦 · C. Gale🇨🇦

    The collective behaviour of hadronic particles has been observed in high multiplicity proton-lead collisions at the Large Hadron Collider (LHC), as well as in deuteron-gold collisions at the Relativistic Heavy-Ion Collider (RHIC). In this work we present the first calculation, in the hydrodynamic framework, of thermal photon radiation from such small collision systems. Owing to their compact size, these systems can reach temperatures comparable to those in central nucleus-nucleus collisions. The thermal photons can thus shine over the prompt background, and increase the low direct photon spectrum by a factor of 2-3 in 0-1% p+Pb collisions at 5.02 TeV. This thermal photon enhancement can therefore serve as a clean signature of the existence of a hot quark-gluon plasma during the evolution of these small collision systems, as well as validate hydrodynamic behavior in small systems.

    Comments:
    6 pages, 4 figures
    Subjects:
    Nuclear Theory (nucl-th); High Energy Physics — Phenomenology (hep-ph); Nuclear Experiment (nucl-ex)
    arXiv:
    1504.07989 [pdf]
    PRL(2016)·42 citations
  2. 02

    [Submitted on 30 Apr 2015]

    Rho meson form factors in a confining Nambu--Jona-Lasinio model

    Manuel E. Carrillo-Serrano🇦🇺 · Wolfgang Bentz🇯🇵 · Ian C. Cloët🇺🇸 · Anthony W. Thomas🇦🇺

    Elastic electromagnetic form factors for the meson are calculated in a Nambu--Jona-Lasinio model which incorporates quark confinement through the use of the proper-time regularization scheme. A comparison is made with recent lattice QCD results and previous quark model calculations for static quantities and the Sachs form factors. The results are qualitatively in good agreement with the lattice QCD calculations, with the exception of the quadrupole moment and corresponding form factor, which may be related to a lack of spherical symmetry on the lattice.

    Comments:
    8 pages, 11 figures
    Subjects:
    Nuclear Theory (nucl-th)
    arXiv:
    1504.08119 [pdf]
    PRC(2015)·36 citations
  3. 03

    [Submitted on 30 Apr 2015]

    Comment on "Neutron Skin of Pb from Coherent Pion Photoproduction"

    A. Gardestig🇺🇸 · C. J. Horowitz🇺🇸 · Gerald A. Miller🇺🇸

    We argue that the reaction mechanism for the coherent pion production is not known with sufficient accuracy to determine the neutron radius of 208Pb to the claimed precision of 0.03 fm.

    Comments:
    2 pages, 0 figures, Comment on C.M. Tarbert et al Phys. Rev. Lett. 112, 242502 (2014)
    Subjects:
    Nuclear Theory (nucl-th); High Energy Physics — Phenomenology (hep-ph); Nuclear Experiment (nucl-ex)
    arXiv:
    1504.08347 [pdf]
    8 citations
  4. 04

    [Submitted on 30 Apr 2015]

    Systematics of nucleon density distributions and neutron skin of nuclei

    W. M. Seif · Hesham Mansour

    Proton and neutron density profiles of 760 nuclei in the mass region of A=16-304are analyzed using the Skyrme energy density for the parameter set SLy4. Simple formulae are obtained to fit the resulting radii and diffuseness data. These formulae may be useful to estimate the values of the unmeasured radii, and especially in extrapolating charge radius values for nuclei which are far from the valley of stability or to perform analytic calculations for bound and/or scattering problems. The obtained neutron and proton root-mean-square radii and the neutron skin thicknesses are in agreement with the available experimental data.

    Comments:
    14 pages,5 figures. arXiv admin note: text overlap with arXiv:1003.5225 by other authors
    Subjects:
    Nuclear Theory (nucl-th)
    arXiv:
    1504.08350 [pdf]
    IJMPE(2015)·59 citations

Affiliations

first authorsco-authorsvia INSPIRE