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Nuclear Theory·nucl-th

Wednesday·October 25, 2023

7 papers—3 primary·4 cross-listed

All7Primary3Cross-lists4
  1. 01

    [Submitted on 23 Oct 2023]

    Effects of nuclear structure and quantum interference on diffractive vector meson production in ultra-peripheral nuclear collisions

    Heikki Mäntysaari🇫🇮 · Farid Salazar🇺🇸 · Björn Schenke🇺🇸 · Chun Shen🇺🇸 · Wenbin Zhao🇺🇸

    We study diffractive vector meson production in ultra-peripheral collisions (UPCs) of heavy nuclei, utilizing a theoretical framework based on the Color Glass Condensate (CGC) formalism. We focus on Au+Au, U+U, Ru+Ru, Zr+Zr, and Pb+Pb collisions, examining the transverse momentum dependence of vector meson production cross-sections and asymmetries in the decay product distributions to explore the role of nuclear geometry. The angular modulation is due to the linear polarization of the incoming photons and quantum interference effects. We extract nuclear radii and find them to be consistent with experimental data from the STAR collaboration. The amplitudes of the modulation in the cross-section and the extracted radii depend on the nuclear geometry. This dependence is dominated by the geometry-dependent variation of the minimum impact parameter required for ultra-peripheral collisions.

    Subjects:
    Nuclear Theory (nucl-th); High Energy Physics — Phenomenology (hep-ph); Nuclear Experiment (nucl-ex)
    arXiv:
    2310.15300 [pdf]
    PRC(2024)·34 citations
  2. 02

    [Submitted on 24 Oct 2023]

    Dynamical and finite-size effects on the criterion of first-order phase transition

    Lijia Jiang🇨🇳 · Fei Gao🇨🇳 · Yu-xin Liu🇨🇳

    To identify first-order phase transitions in the dynamical process similar to the relativistic heavy-ion collisions, we investigate the dynamical behaviors of the first-order phase transition criterion in the Fokker-Planck framework. In the thermodynamic limit, the criterion can be expressed as combinations of cumulants or coefficients of an Ising-like effective potential. Our study reveals that factors such as phase transition scenarios, initial temperature, system volume, relaxation rate, and evolution trajectory have great impacts on the criterion, a larger initial temperature, a smaller volume, a larger relaxation rate, or bending of the trajectory will all lead to a reduction of the first-order phase transition signal, while volume expansion over time preserves signal integrity. Analysis along a hypothetical freezeout line shows that the signal is possibly preserved at relatively large chemical potentials.

    Comments:
    11 pages, 10 figures
    Subjects:
    Nuclear Theory (nucl-th); High Energy Physics — Phenomenology (hep-ph)
    arXiv:
    2310.15770 [pdf]
    EPJC(2025)·4 citations
  3. 03

    [Submitted on 24 Oct 2023]

    Acceptance effect on the ratio of light nuclei coalescence yields as a probe of nucleon density fluctuations

    Michael X. Zhang · An Gu

    We employ a coalescence model to form deuterons (), tritons () and helium-3 () nuclei from a uniformly distributed volume of protons ({\rm p}) and neutrons ({\rm n}). We study the ratio of light nuclei yields as a function of the neutron density fluctuations. We investigate the effect of finite transverse momentum () acceptance on the ratio, in particular, the "extrapolation factor" () for the ratio as functions of the spectral shape and the magnitude of neutron density fluctuations. It is found that is monotonic in spectra "temperature" parameter and neutron density fluctuation magnitude; variations in the latter are relatively small. We also examine in realistic simulations using kinematic distributions of protons measured in heavy ion collision data. It is found that is smooth and monotonic as a function of beam energy. We conclude that extrapolation from limited ranges would not create, enhance, or reduce a local peak of the ratio in beam energy. Our study provides a necessary benchmark for light nuclei ratios as a probe of nucleon density fluctuations, an important observable in the search for the critical point of nuclear matter.

    Subjects:
    Nuclear Theory (nucl-th); Nuclear Experiment (nucl-ex)
    arXiv:
    2310.15962 [pdf]
    Nucl.Sci.Tech.(2025)·2 citations
  4. 04

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

    Dissociation and thermodynamical properties of heavy quarkonia in an anisotropic strongly coupled hot QGP: using baryonic chemical potential

    Siddhartha Solanki🇮🇳 · Manohar Lal🇮🇳 · Rishabh Sharma🇮🇳 · Vineet Kumar Agotiya🇮🇳

    We extended the recent work Phys. Rev. D 97(9), 094033 (2018) to investigate quarkonium dissociation in presence of baryonic chemical potential (mu_b) and anisotropy ({\xi}) using quasi-particle approach in hot quantum chromodynamics (QCD) medium. We have determined binding energy and thermal width of S-states of charmonia and bottomonia for n=1 and n=2 (radial quantum number) with anisotropic parameter ({\xi}) and baryonic chemical potential. We have also determined the effects of baryonic chemical potential and anisotropy on mass spectra of 1S-states of quarkonia and the results obtained were consistent with theoretical and experimental works. But the key result obtained was dissociation temperature of the S-states with the effect of {mu_b} and {\xi}. At last, we have calculated the thermodynamical properties of QGP (i.e., pressure, energy density and speed of sound) using the parameter {\xi} and {mu_b}, which is the main key to study suppression of the quarkonium with latest determined value of energy density psNN after incorporating the effect of {\xi} and (mu_b).

    Comments:
    23 pages, 15 figures
    Subjects:
    High Energy Physics — Phenomenology (hep-ph); Nuclear Theory (nucl-th)
    arXiv:
    2310.15680 [pdf]
    0 citations
  5. 05

    [Submitted on 24 Oct 2023] (cross-list from physics.atm-clus)

    Improved action for contact effective field theory

    L. Contessi🇫🇷 · M. Schäfer🇨🇿 · U. van Kolck🇫🇷

    We present an improved action for renormalizable effective field theories (EFTs) of systems near the two-body unitarity limit. The ordering of EFT interactions is constrained, but not entirely fixed, by the renormalization group. The remaining freedom can be used to improve the theory's convergence, to simplify its applications, and to connect it to phenomenological models. We exemplify the method on a contact theory applied to systems of up to five He atoms. We solve the EFT at leading order including a subleading interaction that accounts for part of the two-body effective range. We show that the effects of such fake range can be compensated in perturbation theory at next-to-leading order, as long as the fake range is smaller or comparable to the experimental effective range. These results open the possibility of using similar improved actions for other many-body systems.

    Comments:
    15 pages, 5 figures
    Subjects:
    physics.atm-clus (physics.atm-clus); Quantum Gases (cond-mat.quant-gas); Nuclear Theory (nucl-th); Atomic Physics (physics.atom-ph)
    arXiv:
    2310.15760 [pdf]
    PRA(2024)·15 citations
  6. 06

    [Submitted on 24 Oct 2023] (cross-list from hep-th)

    Anomalous Strangeness Transport

    Eugenio Megias🇪🇸 · Miguel A. Vazquez-Mozo🇪🇸

    Nondissipative transport of strangeness is studied in a chiral hadronic plasma with three flavors. In the phase in which chiral symmetry is preserved, strangeness transport is found to be driven by both an external magnetic field and fluid vorticity. As for the constitutive relations of the baryon and electromagnetic currents, they exhibit vortical terms proportional to the strangeness chemical potential. In the superfluid phase, transverse nondissipative diffusion of the baryon, electromagnetic, and strangeness charges is found, which survives in the limit of vanishing chiral imbalance and mixes in a fashion similar to standard dissipative diffusion in quark-gluon plasma.

    Comments:
    12 pages, LaTeX, no figures. v2: minor changes, discussion on T-transformation of transport coefficients included, typos corrected, and references added. It matches the version to be published in Journal of High Energy Physics
    Subjects:
    High Energy Physics — Theory (hep-th); High Energy Physics — Phenomenology (hep-ph); Nuclear Theory (nucl-th)
    arXiv:
    2310.15868 [pdf]
    JHEP(2024)·0 citations
  7. 07

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

    Study of Quarkonium properties using SUSYQM method with baryonic chemical potential

    Siddhartha Solanki🇮🇳 · Manohar Lal🇮🇳 · Rishabh Sharma🇮🇳 · Vineet Kumar Agotiya🇮🇳

    In this article, we employed the Quasi-particle debye mass at finite baryonic chemical potential which can be used in the medium modified heavy quark potential to solve the N-dimensional Schroedinger equation. The bound state solution of the Schroedinger equation using Cornell potential is obtained by Super-Symmetry Quantum Mechanics (SUSYQM) method. The thermodynamical properties of quark matter is calculated by using baryonic chemical potential (mu). We found that the binding energy of quarkonia dissociates more with quasi-particle debye mass in comparison to non-perturbative and leading order debye mass. The medium modified form of potential (real part) has been used to study the thermodynamical properties of quark matter with different equation of states (EoS) (i.e., pressure, energy density and speed of sound) with {mu}. The mass spectra of quarkonia has been also calculated in the N-dimensional space, and compared with the experimental data at N=3. We have also calculated the dissociation temperature (T_D) for the ground states of quarkonium using the dissociation criteria of thermal width.

    Comments:
    20 pages, 9 figures
    Subjects:
    High Energy Physics — Phenomenology (hep-ph); Nuclear Theory (nucl-th)
    arXiv:
    2310.16023 [pdf]
    Int.J.Mod.Phys.A(2022)·9 citations

Affiliations

first authorsco-authorsvia INSPIRE