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Nuclear Theory·nucl-th

Tuesday·April 9, 2019

11 papers—8 primary·3 cross-listed

All11Primary8Cross-lists3
  1. 09

    [Submitted on 8 Apr 2019] (cross-list from hep-ph)

    Dynamical supersymmetry for strange quark and antidiquark in hadron mass spectrum

    Taiju Amano (1,2)🇯🇵 · Daisuke Jido (2,1) ((1) Tokyo Metropolitan University, (2) Tokyo Institute of Technology)🇯🇵

    Speculating that the diquark with spin 0 has a similar mass to the constituent quark, we introduce a symmetry between the quark and the diquark. Constructing an algebra for this symmetry, we regard a triplet of the quarks with spin up and down and the diquark with spin 0 as a fundamental representation of this algebra. We further build higher representations constructed by direct products of the fundamental representations. We propose assignments of hadrons to the multiples of this algebra. We find in particular that , and form a triplet, a nonet and a quintet, respectively, where is a genuine tetraquark meson composed of . We also find a mass relation between them by introducing the symmetry breaking due to the mass difference between the quark and the diquark. The masses of possible tetraquarks and are estimated from the symmetry breaking and the masses of and to be 2.942 GeV and 6.261 GeV, respectively.

    Comments:
    22 pages
    Subjects:
    High Energy Physics — Phenomenology (hep-ph); Nuclear Theory (nucl-th)
    arXiv:
    1904.03882 [pdf]
    PTEP(2019)·3 citations
  2. 10

    [Submitted on 8 Apr 2019] (cross-list from hep-lat)

    A Lattice Story of Proton Spin

    Yi-Bo Yang🇨🇳

    In this contribution, I summarized the recent Lattice QCD consensuses on the quark helicity, plus the investigations on the gluon helicity and orbital angular momenta. The preliminary non-perturbative normalized and renormalized Ji quark and gluon angular momentum results are also reported and compared with the previous 1-loop perturbative renormalized results.

    Comments:
    14 pages, 10 figures, Proceedings for the 36th Annual International Symposium on Lattice Field Theory, 22-28 July 2018, Michigan State University, East Lansing, Michigan, USA. References are updated
    Subjects:
    High Energy Physics — Lattice (hep-lat); High Energy Physics — Phenomenology (hep-ph); Nuclear Theory (nucl-th)
    arXiv:
    1904.04138 [pdf]
    PoS(2019)·7 citations
  3. 11

    [Submitted on 8 Apr 2019] (cross-list from astro-ph.HE)

    Constraining the neutron-matter equation of state with gravitational waves

    Michael McNeil Forbes🇺🇸 · Sukanta Bose🇺🇸 · Sanjay Reddy🇺🇸 · Dake Zhou🇺🇸 · Arunava Mukherjee🇩🇪 · Soumi De🇺🇸

    We show how observations of gravitational waves from binary neutron star (BNS) mergers over the next few years can be combined with insights from nuclear physics to obtain useful constraints on the equation of state (EoS) of dense matter, in particular, constraining the neutron-matter EoS to within 20% between one and two times the nuclear saturation density . Using Fisher information methods, we combine observational constraints from simulated BNS merger events drawn from various population models with independent measurements of the neutron star radii expected from x-ray astronomy (the Neutron Star Interior Composition Explorer (NICER) observations in particular) to directly constrain nuclear physics parameters. To parameterize the nuclear EoS, we use a different approach, expanding from pure nuclear matter rather than from symmetric nuclear matter to make use of recent quantum Monte Carlo (QMC) calculations. This method eschews the need to invoke the so-called parabolic approximation to extrapolate from symmetric nuclear matter, allowing us to directly constrain the neutron-matter EoS. Using a principal component analysis, we identify the combination of parameters most tightly constrained by observational data. We discuss sensitivity to various effects such as different component masses through population-model sensitivity, phase transitions in the core EoS, and large deviations from the central parameter values.

    Comments:
    13 pages, 9 figures + supplement 11 pages
    Subjects:
    High Energy Astrophysical Phenomena (astro-ph.HE); General Relativity and Quantum Cosmology (gr-qc); Nuclear Theory (nucl-th)
    arXiv:
    1904.04233 [pdf]
    PRD(2019)·58 citations

Affiliations

first authorsco-authorsvia INSPIRE