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Nuclear Theory·nucl-th

Thursday·December 18, 2014

15 papers—7 primary·8 cross-listed

All15Primary7Cross-lists8
  1. 01

    [Submitted on 16 Dec 2014]

    Kinetic freeze out from an anisotropic fluid in high-energy heavy-ion collisions: particle spectra, Hanbury Brown-Twiss radii, and anisotropic flow

    Nicolas Borghini🇩🇪 · Steffen Feld🇩🇪 · Christian Lang🇩🇪

    Dissipative relativistic fluid-dynamical descriptions of the extended fireball formed in high-energy heavy-ion collisions are quite successful, yet require a prescription for converting the fluid into particles. We present arguments in favour of using a locally anisotropic momentum distribution for the particles emitted from the fluid, so as to smooth out discontinuities introduced by the usual conversion prescriptions. Building on this ansatz, we investigate the effect of the asymmetry on several observables of heavy ion physics.

    Comments:
    7 pages, 6 figures; v2: accepted for publication in Eur. Phys. J. C
    Subjects:
    Nuclear Theory (nucl-th); High Energy Physics — Phenomenology (hep-ph); Nuclear Experiment (nucl-ex)
    arXiv:
    1412.5199 [pdf]
    EPJC(2015)·2 citations
  2. 02

    [Submitted on 17 Dec 2014]

    On the lepton-nucleon neutral and charged current deep inelastic scattering cross sections

    Xing-Long Li🇨🇳 · Yu-Liang Yan🇨🇳 · Xiao-Mei Li🇨🇳 · Dai-Mei Zhou🇨🇳 · Xu Cai🇨🇳 · Ben-Hao Sa🇨🇳

    Based on the requirement in the simulation of lepton-nucleus deep inelastic scattering (DIS), we construct a fortran program LDCS 1.0 calculating the differential and total cross sections for the unpolarized charged lepton-unpolarized nucleon and neutrino-unpolarized nucleon neutral current (charged current) DIS at leading order. Any set of the experimentally fitted parton distribution functions could be employed directly. The mass of incident and scattered leptons is taken into account and the boundary conditions calculating the single differential and total cross section are studied. The calculated results well agree with the corresponding experimental data which indicating the LDCS 1.0 program is good. It is also turned out that the effect of tauon mass is not negligible in the GeV energy level.

    Comments:
    23 pages, 9 figures, FORTRAN codes and readme files attached
    Subjects:
    Nuclear Theory (nucl-th); High Energy Physics — Phenomenology (hep-ph)
    arXiv:
    1412.5268 [pdf]
    1 citation
  3. 03

    [Submitted on 17 Dec 2014]

    Stiffer EoS for Compact Star with New Scaling Law

    Kyungmin Kim🇰🇷 · T.T.S. Kuo🇺🇸 · Hyun Kyu Lee🇰🇷 · Jaehyun Lee🇰🇷 · Mannque Rho🇫🇷

    We present in this paper a simple and unequivocal prediction on the deformation of the compact star, that will be measured in gravity waves, with an EoS obtained in renormailzation-group implemented effective field theory anchored on scale and hidden-local symmetric Lagrangian endowed with topology change . The objective is not to offer a superior or improved EoS for compact stars but to confront with a forthcoming astrophysical observable the given model formulated in what is considered to be consistent with the premise of QCD. The model so obtained is found to satisfactorily describe the observation of a 2-solar mass neutron star with a minimum number of parameters. Specifically the observable we are considering in this paper is the tidal deformability parameter (equivalently the Love number, ) in gravity waves. The merit of our prediction is that the prediction can be readily confirmed or falsified by forth-coming aLIGO and aVirgo gravity-wave observations and provide a valuable guidance for arriving at a better understanding of highly compressed baryonic matter.

    Comments:
    5 pages, 3 figures, Revision in Abstract, section I and IV with references added. Results unchanged
    Subjects:
    Nuclear Theory (nucl-th); High Energy Astrophysical Phenomena (astro-ph.HE); High Energy Physics — Phenomenology (hep-ph)
    arXiv:
    1412.5380 [pdf]
    1 citation
  4. 04

    [Submitted on 17 Dec 2014]

    Hadron Resonance Gas Equation of State from Lattice QCD

    V. Vovchenko🇩🇪 · D. V. Anchishkin🇺🇦 · M. I. Gorenstein🇺🇦

    The Monte Carlo results in lattice QCD for the pressure and energy density at small temperature MeV and zero baryonic chemical potential are analyzed within the hadron resonance gas model. Two extensions of the ideal hadron resonance gas are considered: the excluded volume model which describes a repulsion of hadrons at short distances and Hagedorn model with the exponential mass spectrum. Considering both of these models one by one we do not find the conclusive evidences in favor of any of them. The controversial results appear because of rather different sensitivities of the pressure and energy density to both excluded volume and Hagedorn mass spectrum effects. On the other hand, we have found a clear evidence for a simultaneous presence of both of them. They lead to rather essential contributions: suppression effects for thermodynamical functions of the hadron resonance gas due to the excluded volume effects and enhancement due to the Hagedorn mass spectrum.

    Comments:
    15 pages, 5 figures
    Subjects:
    Nuclear Theory (nucl-th); High Energy Physics — Lattice (hep-lat); High Energy Physics — Phenomenology (hep-ph)
    arXiv:
    1412.5478 [pdf]
    PRC(2015)·89 citations
  5. 05

    [Submitted on 17 Dec 2014]

    Charge Symmetry Breaking in Electromagnetic Nucleon Form Factors in Elastic Parity-Violating Electron-Nucleus Scattering

    Gerald A. Miller🇺🇸

    The effects of charge symmetry breaking in nucleon electromagnetic form factors on parity- violating elastic electron-12C scattering is studied, and found to be much smaller than other known effects. The analysis of a planned experiment is discussed.

    Comments:
    6 pages 3 figures
    Subjects:
    Nuclear Theory (nucl-th); High Energy Physics — Phenomenology (hep-ph); Nuclear Experiment (nucl-ex)
    arXiv:
    1412.5515 [pdf]
    PRC(2015)·2 citations
  6. 06

    [Submitted on 17 Dec 2014]

    Form Factors in the Algebraic Cluster Model

    Roelof Bijker

    I present a derivation of form factors in the Algebraic Cluster Model for an arbitrary number of identical clusters. The form factors correspond to representation matrix elements which are derived in closed form for the harmonic oscillator and deformed oscillator limits. These results are relevant for applications in nuclear, molecular and hadronic physics.

    Comments:
    8 pages, 4 figures, accepted for publication in Physica Scripta
    Subjects:
    Nuclear Theory (nucl-th); Nuclear Experiment (nucl-ex)
    arXiv:
    1412.5552 [pdf]
    Phys.Scripta(2015)·3 citations
  7. 07

    [Submitted on 17 Dec 2014]

    Valence and sea quarks in the nucleon

    Roelof Bijker🇲🇽 · Elena Santopinto🇮🇹

    In this contribution, we discuss the spin and flavor content of the proton in the framework of the unquenched quark model, and address the role of valence and sea quarks in the nucleon.

    Comments:
    4 pages, 2 tables, to appear in Journal of Physics: Conference Series
    Subjects:
    Nuclear Theory (nucl-th); High Energy Physics — Phenomenology (hep-ph)
    arXiv:
    1412.5559 [pdf]
    J.Phys.Conf.Ser.(2015)·3 citations

Affiliations

first authorsco-authorsvia INSPIRE