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Nuclear Theory·nucl-th

Friday·November 3, 2017

9 papers—4 primary·5 cross-listed

All9Primary4Cross-lists5
  1. 05

    [Submitted on 30 Oct 2017] (cross-list from hep-lat)

    Lattice calculation of hadronic tensor of the nucleon

    Jian Liang🇺🇸 · Keh-Fei Liu🇺🇸 · Yi-Bo Yang🇺🇸

    We report an attempt to calculate the deep inelastic scattering structure functions from the hadronic tensor calculated on the lattice. We used the Backus-Gilbert reconstruction method to address the inverse Laplace transformation for the analytic continuation from the Euclidean to the Minkowski space.

    Comments:
    8 pages, 5 figures; Proceedings of the 35th International Symposium on Lattice Field Theory, 18-24 June 2017, Granada, Spain
    Subjects:
    High Energy Physics — Lattice (hep-lat); High Energy Physics — Phenomenology (hep-ph); Nuclear Theory (nucl-th)
    arXiv:
    1710.11145 [pdf]
    EPJ Web Conf.(2018)·31 citations
  2. 06

    [Submitted on 1 Nov 2017] (cross-list from astro-ph.HE)

    Imprints of neutrino-pair flavor conversions on nucleosynthesis in ejecta from neutron-star merger remnants

    Meng-Ru Wu🇹🇼 · Irene Tamborra🇩🇰 · Oliver Just🇩🇪 · Hans-Thomas Janka🇩🇪

    The remnant of neutron star mergers is dense in neutrinos. By employing inputs from one hydrodynamical simulation of a binary neutron star merger remnant with a black hole of in the center, dimensionless spin parameter and an accretion torus of , the neutrino emission properties are investigated as the merger remnant evolves. Initially, the local number density of is larger than that of everywhere above the remnant. Then, as the torus approaches self-regulated equilibrium, the local abundance of neutrinos overcomes that of antineutrinos in a funnel around the polar region. The region where the fast pairwise flavor conversions can occur shrinks accordingly as time evolves. Still, we find that fast flavor conversions do affect most of the neutrino-driven ejecta. Assuming that fast flavor conversions lead to flavor equilibration, a significant enhancement of nuclei with mass numbers is found as well as a change of the lanthanide mass fraction by more than a factor of a thousand. Our findings hint towards a potentially relevant role of neutrino flavor oscillations for the prediction of the kilonova (macronova) lightcurves and motivate further work in this direction.

    Comments:
    16 pages, 12 figures, minor modifications to match the published version
    Subjects:
    High Energy Astrophysical Phenomena (astro-ph.HE); High Energy Physics — Phenomenology (hep-ph); Nuclear Theory (nucl-th)
    arXiv:
    1711.00477 [pdf]
    PRD(2017)·135 citations
  3. 07

    [Submitted on 1 Nov 2017] (cross-list from nucl-ex)

    Sequential Strangeness Freeze-out

    Rene Bellwied🇺🇸

    I will describe the latest results from lattice QCD pertaining to a potential flavour hierarchy in the hadronic freeze-out from the QCD crossover region. I will compare these results to a variety of improved hadronic resonance gas calculations and to experimental data of fluctuations of net-charge, net-proton and net-kaon multiplicity distributions, which serve as a proxy for the susceptibilities of conserved quantum numbers on the lattice. I will conclude that there is intriguing evidence for a flavour dependent freeze-out, and I will suggest expansions to the experimental program at RHIC and the LHC that could potentially demonstrate the impact of a flavour separation during hadronization.

    Comments:
    6 pages, 4 figures, SQM 2017 proceedings
    Subjects:
    Nuclear Experiment (nucl-ex); Nuclear Theory (nucl-th)
    arXiv:
    1711.00514 [pdf]
    EPJ Web Conf.(2018)·16 citations
  4. 08

    [Submitted on 2 Nov 2017] (cross-list from hep-ph)

    In-medium properties of pseudoscalar and mesons

    Rahul Chhabra🇮🇳 · Arvind Kumar🇮🇳

    We calculate the shift in masses and decay constants of and mesons in hot and dense asymmetric strange hadronic matter using QCD sum rules and chiral SU(3) model. In-medium strange quark condensates , and gluon condensates to be used in the QCD sum rules for pseudoscalar and mesons are calculated using chiral SU(3) model. As an application of our present work, we calculate the in-medium decay widths of the excited (c) states and decaying to (,) mesons. The medium effects in their decay widths are incorporated through the mass modification of the and mesons. Results of the present investigation may be helpful to understand the possible outcomes of the future experiments like CBM and PANDA under the FAIR facility.

    Comments:
    34 pages annd 8 figures
    Subjects:
    High Energy Physics — Phenomenology (hep-ph); Nuclear Theory (nucl-th)
    arXiv:
    1711.00631 [pdf]
    EPJC(2017)·23 citations
  5. 09

    [Submitted on 2 Nov 2017] (cross-list from hep-ph)

    Valence Quark and Gluon Distributions of Kaon from J/Psi Production

    Jen-Chieh Peng🇺🇸 · Wen-Chen Chang🇹🇼 · Stephane Platchkov🇫🇷 · Takahiro Sawada🇺🇸

    The only experimental information on the parton distribution of kaons was obtained from the scarce kaon-induced Drell-Yan cross section data. From these data, evidence for a valence quark distribution of kaon softer than that of pion was found. We study the feasibility to extract kaon's valence quark distribution via the existing kaon-induced J/psi production data. We compare the NA3 data on the K- / pi- and K+ / pi+ ratios for J/psi production on a platinum target with theoretical calculations based on the color-evaporation model. We show that the NA3 data on J/psi production provide an independent evidence for a valence quark distribution softer in kaon than in pion. The data also suggest different gluon distributions for kaon and pion.

    Comments:
    5 pages, 4 figures
    Subjects:
    High Energy Physics — Phenomenology (hep-ph); Nuclear Theory (nucl-th)
    arXiv:
    1711.00839 [pdf]
    13 citations

Affiliations

first authorsco-authorsvia INSPIRE