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Nuclear Theory·nucl-th

Thursday·January 24, 2019

9 papers—5 primary·4 cross-listed

All9Primary5Cross-lists4
  1. 06

    [Submitted on 22 Jan 2019] (cross-list from hep-ph)

    and as triangle singularities

    S. X. Nakamura (Univ. Science and Technology of China)🇨🇳 · K. Tsushima (Univ. Cruzeiro do Sul)🇧🇷

    discovered by the Belle and confirmed by the LHCb in is generally considered to be a charged charmonium-like state that includes minimally two quarks and two antiquarks. found in by the Belle is also a good candidate of a charged charmonium-like state. We demonstrate that kinematical singularities in triangle loop diagrams induce a resonance-like behavior that can consistently explain the properties (mass, width, and Argand plot) of and from the experimental analyses. The triangle diagrams include only experimentally well-established hadrons. Applying this idea to , we also identify triangle singularities that behave like , but no triangle diagram is available for . This is consistent with the LHCb's finding that their description of the data is significantly improved by including a contribution while seems to hardly contribute. Even though the proposed mechanisms have uncertainty in the absolute strengths which are currently difficult to estimate, they are certainly a compelling alternative to tetraquark-based interpretations of and .

    Comments:
    6 pages, 5 figures; published version; one figure on the cutoff-dependence added
    Subjects:
    High Energy Physics — Phenomenology (hep-ph); High Energy Physics — Experiment (hep-ex); Nuclear Theory (nucl-th)
    arXiv:
    1901.07385 [pdf]
    PRD(2019)·32 citations
  2. 07

    [Submitted on 22 Jan 2019] (cross-list from gr-qc)

    Degeneracy in Studying the Supranuclear Equation of State and Modified Gravity with Neutron Stars

    Lijing Shao🇨🇳

    It is generally acknowledged that an extrapolation in physics from a well-known scale to an unknown scale is perilous. This prevents us from using laboratory experience to gain precise information for the supranuclear matter inside neutron stars (NSs). With operating and upcoming astronomical facilities, NSs' equation of state (EOS) is expected to be determined at a new level in the near future, under the assumption that general relativity (GR) is the correct theory for gravitation. While GR is a reasonable working assumption yet still an extrapolation, there could be a large uncertainty due to the not-so-well-tested strong gravitational field inside NSs. Here we review some recent theoretical efforts towards a better understanding of the degeneracy between the supranuclear EOS and alternative gravity theories.

    Comments:
    11 pages, 6 figures
    Subjects:
    General Relativity and Quantum Cosmology (gr-qc); High Energy Astrophysical Phenomena (astro-ph.HE); Nuclear Experiment (nucl-ex); Nuclear Theory (nucl-th)
    arXiv:
    1901.07546 [pdf]
    AIP Conf.Proc.(2019)·33 citations
  3. 08

    [Submitted on 19 Jan 2019] (cross-list from nucl-ex)

    Towards a better understanding of the symmetry energy within neutron stars

    C.Y. Tsang · M.B. Tsang · P. Danielewicz · W.G. Lynch · F.J. Fattoyev

    The LIGO-Virgo collaboration ground-breaking detection of the binary neutron-star merger event, GW170817, has expanded efforts to understand the Equation of State (EoS) of nuclear matter. These measurements provide new constraints on the overall pressure, but do not, by itself, elucidate its microscopic origins, including the pressure arising from the symmetry energy, that governs much of the internal structure of a neutron star. To correlate microscopic constraints from nuclear measurements to the GW170817 constraints, we calculate neutron star properties with more than 200 Skyrme energy density functionals that describe properties of nuclei. Calculated neutron-star radii (R) and the tidal deformabilities which show a strong correlation with pressure at twice saturation density. By combining the neutron star EoS extracted from the GW170817 event and the EoS of symmetric matter from nucleus-nucleus collision experiments, we extract the density dependence of the symmetry pressure from 1.2 to 4.5 times saturation density. While the uncertainties in the symmetry pressure are large, they can be reduced with new experimental and astrophysical results.

    Comments:
    10 pages, 3 figures. arXiv admin note: text overlap with arXiv:1807.06571
    Subjects:
    Nuclear Experiment (nucl-ex); Nuclear Theory (nucl-th)
    arXiv:
    1901.07673 [pdf]
    8 citations
  4. 09

    [Submitted on 23 Jan 2019] (cross-list from hep-ph)

    Higher-order corrections to heavy-quark jet quenching

    Boris Blok🇮🇱 · Konrad Tywoniuk🇳🇴

    We calculate higher-order corrections to the quenching factor of heavy-quark jets due to hard, in-medium splittings in the framework of the BDMPS-Z formalism. These corrections turn out to be sensitive to a single mass-scale , where is the medium transport coefficient and the path length, and allow to draw a distinction between the way light, with (in contrast to massless ), and genuinely heavy, with , quark jets are quenched in the medium. We show that the corrections to the quenching factor at high energies are double-logarithmic and qualitatively of the same order as for the massless quark jet.

    Comments:
    31 pages, 4 figures
    Subjects:
    High Energy Physics — Phenomenology (hep-ph); Nuclear Theory (nucl-th)
    arXiv:
    1901.07864 [pdf]
    EPJC(2019)·11 citations

Affiliations

first authorsco-authorsvia INSPIRE