PaperPanorama
FAQ

Nuclear Theory·nucl-th

Friday·May 5, 2023

8 papers—4 primary·4 cross-listed

All8Primary4Cross-lists4
  1. 05

    [Submitted on 3 May 2023] (cross-list from hep-ph)

    Searching for the baryon-to-meson transition region with the MPD at NICA

    Alejandro Ayala🇲🇽 · Wolfgang Bietenholz🇲🇽 · Eleazar Cuautle🇲🇽 · Rodrigo García Formentí🇲🇽 · Rodrigo Guzmán🇲🇽

    In heavy-ion reactions, statistical models predict a rapid change in the baryon-to-meson ratio as a function of the collision energy. This change occurs when the hadronic medium transits from a baryon- to a meson-dominated gas. The transition is expected to take place at a temperature around 140 MeV and a baryon chemical potential around 420 MeV, corresponding to a center-of-mass collision energy of GeV. The energy range of the MPD experiment will be suitable for the exploration of this transition region. We present preliminary results of feasibility studies for the measurement of the transverse momentum spectra for mesons and baryons, using Monte Carlo data samples, in order to study the crossing point between these transverse momenta, as a function of the centrality and collision energy.

    Comments:
    5 pages, LaTex, 5 figures, to appear in Phys. At. Nucl
    Subjects:
    High Energy Physics — Phenomenology (hep-ph); Nuclear Theory (nucl-th)
    arXiv:
    2305.02455 [pdf]
    Phys.Atom.Nucl.(2023)·5 citations
  2. 06

    [Submitted on 4 May 2023] (cross-list from hep-ph)

    Exotic spin-dependent interactions through unparticle exchange

    L. Y. Wu🇨🇳 · K. Y. Zhang🇨🇳 · H. Yan🇨🇳

    The potential discovery of unparticles could have far-reaching implications for particle physics and cosmology. For over a decade, high-energy physicists have extensively studied the effects of unparticles. In this study, we derive six types of nonrelativistic potentials between fermions induced by unparticle exchange in coordinate space. We consider all possible combinations of scalar, pseudo-scalar, vector, and axial-vector couplings to explore the full range of possibilities. Previous studies have only examined scalar-scalar (SS), pseudoscalar-pseudoscalar (PP), vector-vector (VV), and axial-axial-vector (AA) type interactions, which are all parity even. We propose SP and VA interactions to extend our understanding of unparticle physics, noting that parity conservation is not always guaranteed in modern physics. We explore the possibilities of detecting unparticles through the long-range interactions they may mediate with ordinary matter. Dedicated experiments using precision measurement methods can be employed to search for such interactions. We discuss the properties of these potentials and estimate constraints on several coupling constants based on existing experimental data. Our findings indicate that the coupling between vector unparticles and fermions is constrained by up to 9 orders of magnitude more tightly than the previous limits.

    Comments:
    15 pages, 1 figure, 1 table; References updated
    Subjects:
    High Energy Physics — Phenomenology (hep-ph); Nuclear Theory (nucl-th)
    arXiv:
    2305.02628 [pdf]
    JHEP(2024)·4 citations
  3. 07

    [Submitted on 4 May 2023] (cross-list from hep-ph)

    Bound state solutions of the Schrödinger equation for dibaryons via asymptotic iteration method

    Nazanin Shiri🇮🇷 · Narges Tazimi🇮🇷 · Majid Monemzadeh🇮🇷

    Conventionally, hexaquarks are claimed to be exotic particles, most of which have not yet been experimentally detected. In this work, we study the mass spectra of exotic hadrons known as hexaquarks in the form of dibaryons. We investigate the hexaquark states with the twobody configuration in more detail. Starting from the analytical solution of the radial Schrödinger equation for the Hulthén potential in the framework of the asymptotic iteration method (AIM), we obtain the binding energy and mass spectrum of charm and bottom hexaquarks for different spin states. We strongly recommend searching experimentally for double charm and bottom dibaryons in the future.

    Comments:
    27 pages, 3 figures,. arXiv admin note: text overlap with arXiv:math-ph/0609010 by other authors
    Subjects:
    High Energy Physics — Phenomenology (hep-ph); High Energy Physics — Theory (hep-th); Nuclear Theory (nucl-th)
    arXiv:
    2305.02716 [pdf]
    5 citations
  4. 08

    [Submitted on 4 May 2023] (cross-list from hep-ph)

    Quarkonium spin alignment in a vortical medium

    Paulo Henrique De Moura🇧🇷 · Kayman J. Goncalves🇧🇷 · Giorgio Torrieri🇧🇷

    We use a potential model to investigate the phenomenology of quarkonium in a thermal rotating medium, where vorticity and spin density are not necessarily in equilibrium. We find that the quarkonium spin density matrix, as well as the binding energy and melting temperature, are sensitive to both the vorticity and the lack of equilibrium between vorticity and spin. This means that quarkonium spin alignment is a sensitive probe for vorticity and spin within the hydrodynamic phase. Information unequivocably pointing to spin-orbit non-equilibrium dynamics can be obtained from a combined study of quarkonium relative abundance and spin alignment, as well as experimentally obtainable off-diagonal density matrix elements.

    Comments:
    Version accepted for publication, Phys.Rev.D. arXiv admin note: text overlap with arXiv:2205.15087
    Subjects:
    High Energy Physics — Phenomenology (hep-ph); Nuclear Theory (nucl-th)
    arXiv:
    2305.02985 [pdf]
    PRD(2023)·20 citations

Affiliations

first authorsco-authorsvia INSPIRE