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Nuclear Theory·nucl-th

Tuesday·April 25, 2023

13 papers—8 primary·5 cross-listed

All13Primary8Cross-lists5
  1. 09

    [Submitted on 24 Apr 2023] (cross-list from hep-ph)

    QCD bound states in motion

    Paul Hoyer🇫🇮

    I consider the frame dependence of QCD bound states in the presence of a confining, spatially constant gluon field energy density. The states are quantized at equal time in (temporal) gauge. I derive the frame dependence of the wave functions, and demonstrate the Lorentz covariance of the electromagnetic (transition) form factors for states of any spin. The wave functions of states with CM momentum are considered in some detail, verifying their local normalizability and the expected frame dependence of the bound state energy.

    Comments:
    20 pages, 1 figure. Some clarifications added. Version to be published in Phys. Rev. D
    Subjects:
    High Energy Physics — Phenomenology (hep-ph); Nuclear Theory (nucl-th)
    arXiv:
    2304.11903 [pdf]
    PRD(2023)·2 citations
  2. 10

    [Submitted on 24 Apr 2023] (cross-list from hep-ph)

    Investigating the impact of extra resonance states in the van der Waals Hadron Resonance Gas Model

    Nachiketa Sarkar🇮🇳

    We investigate, in addition to the experimentally established hadrons, how the inclusion of extra resonance states, through the Hagedorn mass spectrum (HS) or Quark Model (QM) predicated states, affects the thermodynamic and transport quantities of the hadronic system in the van der Waals hadron resonance gas (VDWHRG) model. We found that the VDWHRG model with the HS provides the most accurate description of the lattice QCD results, both at zero and finite chemical potential. Moreover, the inclusion of these extra states has a significant impact on the van der Waals (VDW) parameters, which, in turn, affect the thermodynamic and transport quantities as well as the likely position of the liquid-gas phase transition critical point in the QCD phase diagram. Additionally, we infer that there is a strong correlation between the van der Waals parameters and the chemical potential. Overall, our study sheds light on the importance of considering extra resonance states and proper tuning of the VDW parameters in the VDWHRG model to enhance the accuracy and reliability of the model in the context of Ultra-relativistic heavy-ion physics.

    Subjects:
    High Energy Physics — Phenomenology (hep-ph); Nuclear Theory (nucl-th)
    arXiv:
    2304.11914 [pdf]
    3 citations
  3. 11

    [Submitted on 24 Apr 2023] (cross-list from hep-ph)

    Diquark and chiral condensate in a self-consistent NJL-type model

    Wen-Li Yuan🇨🇳 · Jingyi Chao🇨🇳 · Ang Li🇨🇳

    In this work, a modified two-flavor NJL-type model is utilized, in which the contact current-current interaction is Fierz-transformed into quark-antiquark interactions and quark-quark interactions, which are directly related to the chiral condensate and diquark condensate, respectively. Under mean-field approximation, the chiral condensate and the diquark condensate are studied on the same footing. We discuss in detail the competition between the chiral condensate and the diquark condensate, which are exclusively paired with u and d quarks, while also investigating the order of the chiral phase transition through an analysis of the resulting chiral susceptibility.

    Comments:
    9 pages,5 figures, Phys. Rev. D (2023) accepted
    Subjects:
    High Energy Physics — Phenomenology (hep-ph); Nuclear Theory (nucl-th)
    arXiv:
    2304.12050 [pdf]
    PRD(2023)·14 citations
  4. 12

    [Submitted on 24 Apr 2023] (cross-list from nucl-ex)

    Coexisting single-particle excitations and octupole correlations in transitional nucleus

    Madhu · A. Y. Deo · Khamosh Yadav · Dhananjaya Sahoo · Y. Y. Wang · Y. K. Wang · J. Meng · Saket Suman · S. K. Tandel · A. Sharma · I. Ahmed · K. Katre and 6 other authors

    The level structure of the transitional nucleus has been extended with the addition of around 20 new transitions. The discrepancies between the placements of several transitions reported in the earlier studies are resolved. The newly-established negative-parity sequence at low excitation energies hints at the expected parity-doublet structures in this nucleus. The properties of the observed simplex bands are compared with that of similar bands in neighboring nuclei. Since the presence of parity-doublet structures reflect octupole correlations, theoretical calculations using reflection-asymmetric triaxial particle rotor model (RAT-PRM) have been performed. A comparison of the observed features of the simplex bands with the predictions of the RAT-PRM calculations suggests that exhibits an intermediate the behavior between the extremes of spherical and octupole-deformed nuclei. The termination of the simplex bands at intermediate energies and the structures lying above reflect the dominance of the single-particle excitations at higher excitation energies.

    Comments:
    15 pages, 16 figures
    Subjects:
    Nuclear Experiment (nucl-ex); Nuclear Theory (nucl-th)
    arXiv:
    2304.12052 [pdf]
    PRC(2023)·6 citations
  5. 13

    [Submitted on 24 Apr 2023] (cross-list from astro-ph.HE)

    Colour-Flavour Locked Quark Stars in Light of the Compact Object in HESS J1731-347 and the GW190814 Event

    P.T. Oikonomou🇬🇷 · Ch.C. Moustakidis🇬🇷

    The central compact object within HESS J1731- 347 possesses unique mass and radius properties that renders it a compelling candidate for a self-bound star. In this research, we examine the capability of quark stars composed of colour superconducting quark matter to explain the latter object by using its marginalised posterior distribution and imposing it as a constraint on the relevant parameter space. Namely, we investigate quark matter for in the colour superconducting phase, incorporating perturbative QCD corrections, and we derive their properties accordingly. The utilised thermodynamic potential of this work possesses an MIT bag model formalism with the parameters being established as flavour-independent. In this instance, we conclude the favour of 3-flavour over 2-flavour colour superconducting quark matter, isolating our interest on the former. The parameter space is further confined due to the additional requirement for a high maximum mass (), accounting for GW's secondary companion. We pay a significant attention on the speed of sound and the trace anomaly (proposed as a measure of conformality [\href{https://journals.aps.org/prl/abstract/10.1103/PhysRevLett.129.252702}{10.1103/PhysRevLett.129.252702}]). We conclude that it is possible for colour-flavour locked quark stars to reach high masses without violating the conformal bound or the if the quartic coefficient value does not exceed an upper limit which is solely dependent on the established . For , we find that the limit reads . Lastly, a further study takes place on the agreement of colour-flavour locked quark stars with additional astrophysical objects including the GW and GW events, followed by a relevant discussion.

    Comments:
    13 pages, 10 figures, 2 tables
    Subjects:
    High Energy Astrophysical Phenomena (astro-ph.HE); High Energy Physics — Phenomenology (hep-ph); Nuclear Theory (nucl-th)
    arXiv:
    2304.12209 [pdf]
    PRD(2023)·53 citations

Affiliations

first authorsco-authorsvia INSPIRE