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Nuclear Theory·nucl-th

Friday·September 6, 2019

10 papers—6 primary·4 cross-listed

All10Primary6Cross-lists4
  1. 07

    [Submitted on 4 Sept 2019] (cross-list from hep-ph)

    Quark-diquark models and baryonic fluctuations in QCD

    E. Megias🇪🇸 · E. Ruiz Arriola🇪🇸 · L.L. Salcedo🇪🇸

    We study the baryonic fluctuations of electric charge, baryon number and strangeness, by considering a realization of the Hadron Resonance Gas model in the light flavor sector of QCD. We elaborate on the idea that the susceptibilities can be saturated with excited baryonic states with a quark-diquark structure with a linearly confining interaction identical up to a constant to the quark-antiquark potential, . We obtain an overall good agreement with the spectrum obtained with other quark models and with lattice data for the fluctuations.

    Comments:
    6 pages, 5 figures. Talk given by E.Megias at the 22th International Conference in Quantum Chromodynamics (QCD 19), Montpellier, France, 2 - 5 Jul 2019
    Subjects:
    High Energy Physics — Phenomenology (hep-ph); High Energy Physics — Lattice (hep-lat); Nuclear Theory (nucl-th)
    arXiv:
    1909.02039 [pdf]
    Nucl.Part.Phys.Proc.(2020)·0 citations
  2. 08

    [Submitted on 5 Sept 2019] (cross-list from hep-ph)

    Critical point signatures in the cluster expansion in fugacities

    Volodymyr Vovchenko🇩🇪 · Carsten Greiner🇩🇪 · Volker Koch🇺🇸 · Horst Stoecker🇩🇪

    The QCD baryon number density can formally be expanded into a Laurent series in fugacity, which is a relativistic generalization of Mayer's cluster expansion. We determine properties of the cluster expansion in a model with a phase transition and a critical point at finite baryon density, in which the Fourier coefficients of the expansion can be determined explicitly and to arbitrary order. The asymptotic behavior of Fourier coefficients changes qualitatively as one traverses the critical temperature and it is connected to the branch points of a thermodynamic potential associated with the phase transition. The results are discussed in the context of lattice QCD simulations at imaginary chemical potential. We argue that the location of a branch point closest to the imaginary chemical potential axis can be extracted through an analysis of an exponential suppression of Fourier coefficients. This is illustrated using the four leading coefficients both in a toy model as well as by using recent lattice QCD data.

    Comments:
    14 pages, 5 figures. Title adjusted, appendix with NJL model analysis added, to be published in Physical Review D
    Subjects:
    High Energy Physics — Phenomenology (hep-ph); High Energy Physics — Lattice (hep-lat); Nuclear Theory (nucl-th)
    arXiv:
    1909.02276 [pdf]
    PRD(2020)·10 citations
  3. 09

    [Submitted on 5 Sept 2019] (cross-list from hep-ph)

    Initial and final state temperatures of antiproton emission sources in high energy collisions

    Qi Wang🇨🇳 · Fu-Hu Liu🇨🇳

    The momentum or transverse momentum spectra of antiprotons produced at mid-rapidity in proton-helium (+He), gold-gold (Au+Au), deuton-gold (+Au), and lead-lead (Pb+Pb) collisions over an energy range from a few GeV to a few TeV are analyzed by the Erlang distribution, the inverse power-law (the Hagedorn function), and the blast-wave fit, or the superposition of two-component step function. The excitation functions of parameters such as the mean transverse momentum, initial state temperature, kinetic freeze-out temperature, and transverse flow velocity increase (slightly) from a few GeV to a few TeV and from peripheral to central collisions. At high energy and in central collisions, large collision energy is deposited in the system, which results in high degrees of excitation and expansion.

    Comments:
    17 pages, 8 figures. International Journal of Theoretical Physics, accepted
    Subjects:
    High Energy Physics — Phenomenology (hep-ph); High Energy Physics — Experiment (hep-ex); Nuclear Experiment (nucl-ex); Nuclear Theory (nucl-th)
    arXiv:
    1909.02390 [pdf]
    Int.J.Theor.Phys.(2019)·14 citations
  4. 10

    [Submitted on 5 Sept 2019] (cross-list from hep-ph)

    Holographic tetraquarks and the newly observed at LHCb

    Yizhuang Liu🇨🇳 · Maciej A. Nowak🇵🇱 · Ismail Zahed🇺🇸

    We describe a heavy and exotic tetraquark state as a holographic molecule, by binding the lightest heavy-light meson multiplet to a flavored sphaleron, in the bulk of the Witten-Sakai-Sugimoto model. Bound tetraquark states emerge as Efimov states in the heavy quark limit, with a binding energy for charm tetraquark comparable to the recently reported by the LHCb, but a substantially smaller width, for a large but finite t Hooft coupling. Fixing the parameters of the model at the empirical mass of allows us to predict the bindings of the undiscovered so far bottom-charm and bottom tetraquarks, when interpreted as Efimov states.

    Comments:
    9 pages, discussion on newly discovered added, alternative quantization of moduli as bosons added
    Subjects:
    High Energy Physics — Phenomenology (hep-ph); Nuclear Theory (nucl-th)
    arXiv:
    1909.02497 [pdf]
    PRD(2022)·19 citations

Affiliations

first authorsco-authorsvia INSPIRE