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Nuclear Theory·nucl-th

Monday·February 22, 2021

6 papers—3 primary·3 cross-listed

All6Primary3Cross-lists3
  1. 04

    [Submitted on 18 Feb 2021] (cross-list from hep-ph)

    The Doubly-heavy Tetraquarks () in a Constituent Quark Model with a Complete Set of Harmonic Oscillator Bases

    Sungsik Noh🇰🇷 · Woosung Park🇰🇷 · Su Houng Lee🇰🇷

    We have improved our previous variational method based constituent quark model by introducing a complete set of 3-dimensional harmonic oscillator bases as the spatial part of the total wave function. To assess the validity of our approach, we compared the binding energy, thus calculated with the exact value for the hydrogen model. After fitting to the masses of the ground state hadrons, we apply our new method to analyze the doubly-heavy tetraquark states and compared the result for the binding energies with that from other works. We also calculated the ground state masses of and with . We found that and , both with , are stable against the two lowest threshold meson states with binding energies MeV and MeV, respectively. We further found that is near the lowest threshold. The spatial sizes for the tetraquarks are also discussed.

    Comments:
    20 pages, 10 figures
    Subjects:
    High Energy Physics — Phenomenology (hep-ph); Nuclear Theory (nucl-th)
    arXiv:
    2102.09614 [pdf]
    PRD(2021)·53 citations
  2. 05

    [Submitted on 19 Feb 2021] (cross-list from hep-lat)

    Screening masses towards chiral limit

    Simon Dentinger🇩🇪 · Olaf Kaczmarek🇩🇪 · Anirban Lahiri🇩🇪

    A possible effective restoration of the anomalous symmetry would have a non-trivial effect on the global phase diagram of QCD. In this work we investigate the effective restoration of the through the calculation of scalar and pseudo-scalar screening masses and corresponding susceptibilities, for physical and lower than physical pion masses. Calculations have been performed in (2+1)-flavor HISQ discretization scheme with a physical value of the strange quark mass. Preliminary calculations of the continuum extrapolated scalar and pseudo-scalar masses are presented, based on lattices with three different temporal extent. Non-trivial structure of the difference between scalar and pseudo-scalar susceptibilites are discussed for lattices.

    Comments:
    Contribution to the proceeding of workshop "Criticality in QCD and the Hadron Resonance Gas", 29-31 July 2020, Wrocław, Poland
    Subjects:
    High Energy Physics — Lattice (hep-lat); High Energy Physics — Phenomenology (hep-ph); Nuclear Theory (nucl-th)
    arXiv:
    2102.09916 [pdf]
    Acta Phys.Polon.Supp.(2021)·8 citations
  3. 06

    [Submitted on 19 Feb 2021] (cross-list from hep-ph)

    Evolution of initial stage fluctuations in the glasma

    Pablo Guerrero-Rodríguez🇫🇮 · Tuomas Lappi🇫🇮

    We perform a calculation of the one- and two-point correlation functions of energy density and axial charge deposited in the glasma in the initial stage of a heavy ion collision at finite proper time. We do this by describing the initial stage of heavy ion collisions in terms of freely evolving classical fields whose dynamics obey the linearized Yang-Mills equations. Our approach allows us to systematically resum the contributions of high momentum modes that would make a power series expansion in proper time divergent. We evaluate the field correlators in the McLerran-Venugopalan model using the glasma graph approximation, but our approach for the time dependence can be applied to a general four-point function of the initial color fields. Our results provide analytical insight into the preequilibrium phase of heavy ion collisions without requiring a numerical solution to the Yang-Mills equations.

    Comments:
    19 pages, 6 figures
    Subjects:
    High Energy Physics — Phenomenology (hep-ph); Nuclear Theory (nucl-th)
    arXiv:
    2102.09993 [pdf]
    PRD(2021)·18 citations

Affiliations

first authorsco-authorsvia INSPIRE