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Nuclear Theory·nucl-th

Thursday·November 9, 2017

8 papers—4 primary·4 cross-listed

All8Primary4Cross-lists4
  1. 01

    [Submitted on 8 Nov 2017]

    The balance of attractive and repulsive hadronic interactions: the influence of hadronic spectrum and excluded volume effects on lattice thermodynamics and consequences on experiments

    Paolo Alba

    Repulsive hadronic interactions play a relevant role in the QCD dynamics, attractive ones being represented by resonance formation. In this study we propose different schemes in order to parameterise repulsive interactions, then being able to extract effective sizes of hadrons from fits to lattice QCD simulations. We find that allowing a difference between the strange and light sectors, strange particles are systematically smaller than light ones with equal mass. The very simple implementation of repulsive interactions would in principle allow to extract precise information about all hadronic species once corresponding lattice observables, sensitive to the species of interest, are provided. With the parameterisation which best reproduces lattice data there is also a good description of experimental yields measured by ALICE and STAR experiments.

    Subjects:
    Nuclear Theory (nucl-th); High Energy Physics — Lattice (hep-lat); High Energy Physics — Phenomenology (hep-ph)
    arXiv:
    1711.02797 [pdf]
    PRC(2019)·15 citations
  2. 02

    [Submitted on 8 Nov 2017]

    Possible origin of shoulder in the reactor antineutrino spectrum

    Ajit Kumar Mohanty🇮🇳

    The re-analysis of measured integrated electron spectrum reveals a shape mismatch with respect to the so called ab initio calculation and the ratio resembles well with the recently observed reactor antineutrino shoulder or bump around 5 MeV prompt energy when plotted in a reduced scale where the first two moments (area and average) of the spectrum are made identical (KNO type scaling). However, such bumps are not seen in case of other actinides like and isotopes. Since the magnitude of the bump in is comparable with the experimental observations, can not be the only source of anomaly unless similar contributions come from other uranium and plutonium isotopes as well. Therefore, it is strongly conjectured that the integrated electron spectra of uranium and plutonium isotopes particularly in the MeV to MeV energy range may have additional contributions coming from the harder part of the reactor neutron spectrum which may not be present in the thermal measurements.

    Comments:
    5 pages, 3 figures
    Subjects:
    Nuclear Theory (nucl-th); High Energy Physics — Phenomenology (hep-ph)
    arXiv:
    1711.02801 [pdf]
    2 citations
  3. 03

    [Submitted on 8 Nov 2017]

    High baryon and energy densities achievable in heavy-ion collisions at 39 GeV

    Yu. B. Ivanov🇷🇺 · A. A. Soldatov🇷🇺

    Baryon and energy densities, which are reached in central Au+Au collisions at collision energy of GeV, are estimated within the model of three-fluid dynamics. It is shown that the initial thermalized mean proper baryon and energy densities in a sizable central region approximately are 10 and 40 GeV/fm, respectively. The study indicates that the deconfinement transition at the stage of interpenetration of colliding nuclei makes the system quite opaque. The final fragmentation regions in these collisions are formed not only by primordial fragmentation fireballs, i.e. the baryon-rich matter passed through the interaction region (containing approximately 30\% of the total baryon charge), but also by the baryon-rich regions of the central fireball pushed out to peripheral rapidities by the subsequent almost one-dimensional expansion of the central fireball along the beam direction.

    Comments:
    4 pages, 4 figures, minor corrections, version published in Phys. Rev. C
    Subjects:
    Nuclear Theory (nucl-th); High Energy Physics — Experiment (hep-ex); High Energy Physics — Phenomenology (hep-ph)
    arXiv:
    1711.03069 [pdf]
    PRC(2018)·10 citations
  4. 04

    [Submitted on 8 Nov 2017]

    Bulk viscous corrections to screening and damping in the deconfined phase at high temperature

    Adrian Dumitru🇺🇸

    Non-equilibrium corrections in a hot QCD medium modify the "hard thermal loops" (HTL) which determine the resummed propagators for gluons with soft momenta as well as the Debye screening and Landau damping mass scales. We focus on bulk viscous corrections to a thermal fixed point. The screening and damping mass scales are sensitive to the bulk pressure and perhaps to (pseudo-) critical dynamical scaling of the bulk viscosity in the vicinity of a second-order critical point. This would affect the properties of quarkonium bound states in the deconfined phase.

    Comments:
    7 pages; Proceedings of Critical Point and Onset of Deconfinement - CPOD2017; 7--11 August, 2017, Stony Brook University, Stony Brook, NY; to be published in PoS (SISSA)
    Subjects:
    Nuclear Theory (nucl-th); High Energy Physics — Phenomenology (hep-ph)
    arXiv:
    1711.03072 [pdf]
    PoS(2018)·0 citations

Affiliations

first authorsco-authorsvia INSPIRE