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Nuclear Theory·nucl-th

Thursday·February 8, 2024

10 papers—4 primary·6 cross-listed

All10Primary4Cross-lists6
  1. 01

    [Submitted on 6 Feb 2024]

    Comparative Study of Quarkonium Transport in Hot QCD Matter

    A. Andronic🇩🇪 · P.B. Gossiaux🇫🇷 · P. Petreczky🇺🇸 · R. Rapp🇺🇸 · M. Strickland🇺🇸 · J.P. Blaizot🇫🇷 · N. Brambilla🇩🇪 · P. Braun-Munzinger🇩🇪 · B. Chen🇨🇳 · S. Delorme🇵🇱 · X. Du🇪🇸 · M. A. Escobedo🇪🇸 and 10 other authors

    This document summarizes the efforts of the EMMI Rapid Reaction Task Force on "Suppression and (re)generation of quarkonium in heavy-ion collisions at the LHC", centered around their 2019 and 2022 meetings. It provides a review of existing experimental results and theoretical approaches, including lattice QCD calculations and semiclassical and quantum approaches for the dynamical evolution of quarkonia in the quark-gluon plasma as probed in high-energy heavy-ion collisions. The key ingredients of the transport models are itemized to facilitate comparisons of calculated quantities such as reaction rates, binding energies, and nuclear modification factors. A diagnostic assessment of the various results is attempted and coupled with an outlook for the future.

    Comments:
    54 pages, 19 figures
    Subjects:
    Nuclear Theory (nucl-th); High Energy Physics — Phenomenology (hep-ph)
    arXiv:
    2402.04366 [pdf]
    EPJA(2024)·74 citations
  2. 02

    [Submitted on 7 Feb 2024]

    Spin polarization in relativistic heavy-ion collisions

    Francesco Becattini🇮🇹 · Matteo Buzzegoli🇺🇸 · Takafumi Niida🇯🇵 · Shi Pu🇨🇳 · Ai-Hong Tang🇺🇸 · Qun Wang🇨🇳

    Polarization has opened a new physics chapter in relativistic heavy-ion collisions. Since the first prediction and experimental observation of global spin polarization, a lot of progress has been made in understanding its features, both at experimental and theoretical level. In this paper, we give an overview on the recent advances in this field. The covered topics include a review of measurements of global and local spin polarization of hyperons and the global spin alignment of vector mesons. We account for the basic theoretical framework to describe spin polarization in a relativistic fluid such as the Quark Gluon Plasma, including statistical quantum field theory and local thermodynamic equilibrium, spin hydrodynamics, relativistic kinetic theory with spin and coalescence models.

    Comments:
    RevTeX 4, 41 pages, 12 figures, review article as a book chapter for QGP6
    Subjects:
    Nuclear Theory (nucl-th)
    arXiv:
    2402.04540 [pdf]
    IJMPE(2024)·98 citations
  3. 03

    [Submitted on 7 Feb 2024]

    Perturbative application of next-to-leading order pionless EFT for nuclei in a finite volume

    Tafat Weiss-Attia🇮🇱 · Martin Schäfer🇨🇿 · Betzalel Bazak🇮🇱

    Lattice quantum chromodynamics (LQCD) calculations with physical pion mass would revolutionize nuclear physics by enabling predictions based on the fundamental theory of the strong force. To bridge the gap between finite-volume LQCD results and free-space physical observables, two primary extrapolation methods have been employed so far. The traditional approach relies on the Lüscher formula and its extensions, while a recent alternative employs effective field theories (EFTs) fitted directly to the finite volume data. In this study, we fit pionless EFT with perturbative inclusion of the next-to-leading order to finite-volume energies generated from a phenomenological interaction. The theory is then used to extrapolate the finite-volume results into free space as well as to predict new few-body observables. As a benchmark, we also apply the Lüscher formalism directly to the finite-volume data. Through a comprehensive analysis, we explore the characteristics of order-by-order predictions of the pionless EFT fitted within a finite volume, investigate the limitations of the different extrapolation techniques used, and derive recommended box sizes required for reliable predictions.

    Subjects:
    Nuclear Theory (nucl-th); High Energy Physics — Lattice (hep-lat)
    arXiv:
    2402.04817 [pdf]
    PRD(2024)·3 citations
  4. 04

    [Submitted on 7 Feb 2024]

    A global study of -clusters decay in heavy and superheavy nuclei with half-life and preformation factor

    G. Saxena · P. K. Sharma · Prafulla Saxena

    A detailed study of -clusters decay is exhibited by incorporating crucial microscopic nuclear structure information into the estimations of half-life and preformation factor. For the first time, using the k-cross validation approach, two semi-empirical formulas for (i) -decay half-life and (ii) -particle preformation factor, are picked out and subsequently modified by including shell, odd-nucleon blocking, and asymmetry effects along with the usual dependence on -decay energy () and angular momentum of -particle. Both the formulas are fitted for the two different regions separated by neutron number N126, as from the experimental systematics the role of N126 shell closure is found decisive in determining the trends of , -decay half-life, and -particle preformation factor. It is found that the inclusion of the above-mentioned degrees of freedom significantly reduces the errors in the estimations when compared with several other similar modified/refitted semi-empirical relations indicating the robustness of the proposed formulas. The predictions of -decay half-life throughout the periodic chart have been made including the unknown territory, future probable decay chain of self-conjugate nucleus Ba terminated on Sn, decay chain of Pa through new isotope Ac as well as decay chains of awaiting superheavy nuclei Og and 120.

    Comments:
    13 pages, 7 Figures, Accepted in European Physical Journal A (2024)
    Subjects:
    Nuclear Theory (nucl-th)
    arXiv:
    2402.04970 [pdf]
    EPJA(2024)·9 citations

Affiliations

first authorsco-authorsvia INSPIRE