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Nuclear Theory·nucl-th

Wednesday·July 25, 2018

5 papers—3 primary·2 cross-listed

All5Primary3Cross-lists2
  1. 01

    [Submitted on 24 Jul 2018]

    Experimental results on fluctuations of conserved charges confronted with predictions from canonical thermodynamics

    Peter Braun-Munzinger🇩🇪 · Anar Rustamov🇩🇪 · Johanna Stachel🇩🇪

    The study of multiplicity distributions of identified particles in terms of their higher moments is at the focus of contemporary experimental and theoretical studies. In a thermalized system, combinations of these moments are directly related to the Equation of State (EoS). The ultimate goal of the experimental measurements in relativistic nuclear collisions is, by systematic comparison to QCD and QCD inspired calculations, to probe the dynamics of genuine phase transitions between a hadron gas and the quark-gluon plasma. However, the comparison between experiment and theory is far from trivial, because several non-dynamical effects on fluctuations need to be controlled prior to a meaningful comparison to theoretical predictions. In this report we present quantitative estimates for these non-dynamical contributions using the Canonical Ensemble (CE) formulation of statistical mechanics. Together with analytical formulas we provide also results from Monte Carlo (MC) simulations within the CE and compare our predictions with the corresponding measurements from the STAR experiment.

    Subjects:
    Nuclear Theory (nucl-th)
    arXiv:
    1807.08927 [pdf]
    NPA(2019)·28 citations
  2. 02

    [Submitted on 24 Jul 2018]

    Effects of Finite Size of Constituent Quarks on Nucleon-Nucleon Interaction

    Vanamali C. Shastry🇮🇳 · K. B. Vijaya Kumar (Mangalore University, India)🇮🇳

    We have investigated the effect of the finite size of the constituent quarks on singlet and triplet nucleon-nucleon potentials, obtained in the framework of the nonrelativistic quark model using the resonating group method in the Born-Oppenheimer approximation. The full Hamiltonian used in the investigation includes the kinetic energy, two-body confinement potential, one gluon exchange potential (OGEP), and instanton induced interaction (III). The effects of the smearing of the contact interactions and the variation of the constituent mass of the quarks are discussed.

    Comments:
    9 pages; Significant revision, Results and Discussion expanded, Introduction and Model revised; Format changed
    Subjects:
    Nuclear Theory (nucl-th)
    arXiv:
    1807.09008 [pdf]
    J.Phys.G(2019)·5 citations
  3. 03

    [Submitted on 24 Jul 2018]

    Multi-nucleon transfer in and in stochastic mean-field approach

    Bulent Yilmaz🇹🇷 · Sakir Ayik🇺🇸 · Osman Yilmaz🇹🇷 · A. Sait Umar🇺🇸

    The multi-nucleon exchange mechanism in and collisions is analyzed in the framework of the stochastic mean-field approach. The results of calculations are compared with the TDRPA calculations and the recent data of . A good description of the data and a relatively good agreement with the TDRPA calculations are found.

    Comments:
    6 pages, 6 figures
    Subjects:
    Nuclear Theory (nucl-th)
    arXiv:
    1807.09046 [pdf]
    PRC(2018)·23 citations
  4. 04

    [Submitted on 24 Jul 2018] (cross-list from hep-ph)

    Charged current quasi elastic scattering of muon anti-neutrino off ^{12}C

    Deepika Grover🇮🇳 · Kapil Saraswat🇮🇳 · Prashant Shukla🇮🇳 · Venktesh Singh🇮🇳

    In this work, we study charged current quasi elastic scattering of muon anti-neutrino off nucleon and nucleus using a formalism based on Llewellyn Smith (LS) model. Parameterizations by Galster et al. are used for electric and magnetic Sach's form factors of nucleons. We use Fermi gas model along with Pauli suppression condition to take into account the nuclear effects in anti-neutrino - nucleus QES. We calculate muon anti-neutrino-p and muon anti-neutrino-^{12}C charged current quasi elastic scattering differential and total cross sections for different values of axial mass M_{A} and compare the results with data from GGM, SKAT, BNL, NOMAD, MINERvA and MiniBooNE experiments. The present theoretical approach gives an excellent description of differential cross section data. The calculations with axial mass M_{A} = 0.979 and 1.05 GeV are compatible with data from most of the experiments.

    Comments:
    07 pages, 09 Figures
    Subjects:
    High Energy Physics — Phenomenology (hep-ph); Nuclear Theory (nucl-th)
    arXiv:
    1807.08911 [pdf]
    CPC(2018)·3 citations
  5. 05

    [Submitted on 24 Jul 2018] (cross-list from hep-ph)

    Meson-baryon coupling constants of the SU(3) baryons with flavor SU(3) symmetry breaking

    Ghil-Seok Yang🇰🇷 · Hyun-Chul Kim🇰🇷

    We investigate the strong coupling constants for the baryon octet-octet, decuplet-octet, and decuplet-decuplet vertices with pseudoscalar mesons within a general framework of the chiral quark-soliton model, taking into account the effects of flavor SU(3) symmetry breaking to linear order in the expansion of the strange current quark mass. All relevant dynamical parameters are fixed by using the experimental data on hyperon semileptonic decays and the singlet axial-vector constant of the nucleon. The results of the strong coupling constants for the baryon octet and the pseudoscalar meson octet are compared with those determined from the Jülich-Bonn potential and the Nijmegen extended soft-core potential for hyperon-nucleon scattering. The results of the strong decay widths of the baryon decuplet are in good agreement with the experimental data. The effects of symmetry breaking are sizable on the coupling constants. We predict also the strong coupling constants for the baryons.

    Comments:
    10 pages
    Subjects:
    High Energy Physics — Phenomenology (hep-ph); High Energy Physics — Experiment (hep-ex); Nuclear Experiment (nucl-ex); Nuclear Theory (nucl-th)
    arXiv:
    1807.09090 [pdf]
    PLB(2018)·20 citations

Affiliations

first authorsco-authorsvia INSPIRE