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Nuclear Theory·nucl-th

Monday·September 12, 2022

9 papers—4 primary·5 cross-listed

All9Primary4Cross-lists5
  1. 01

    [Submitted on 8 Sept 2022]

    Bound states and electromagnetic radiation of relativistically rotating cylindrical wells

    Matteo Buzzegoli🇺🇸 · Kirill Tuchin🇺🇸

    We compute the effect of rigid rotation on the non-relativistic bound states. The energy levels of the bound states increase with the angular velocity of rotation until at certain value of the angular velocity they are completely pushed out into the continuum which corresponds to dissociation of the bound states. When the angular velocity exceeds the critical value at which the ground state disappears into the continuum, no bound state is possible. This effect should have important consequences for the phenomenology of the quark-gluon plasma. One of the ways to study it experimentally is to observe the electromagnetic radiation emitted by a rotating bound state. We compute the corresponding intensity of electromagnetic radiation and show that it strongly depends on the angular velocity of rotation.

    Comments:
    13 pages, 5 figures
    Subjects:
    Nuclear Theory (nucl-th); High Energy Astrophysical Phenomena (astro-ph.HE); High Energy Physics — Phenomenology (hep-ph)
    arXiv:
    2209.03991 [pdf]
    NPA(2023)·11 citations
  2. 02

    [Submitted on 9 Sept 2022]

    Enhanced pion-to-proton ratio at the onset of the QCD phase transition

    Thiranat Bumnedpan🇹🇭 · Jan Steinheimer🇩🇪 · Marcus Bleicher🇩🇪 · Ayut Limphirat🇹🇭 · Christoph Herold🇹🇭

    The pion-to-proton ratio is identified as a potential signal for a non-equilibrium first-order chiral phase transition in heavy-ion collisions, as the pion multiplicity is directly related to entropy production. To showcase this effect, a non-equilibrium Bjorken expansion starting from realistic initial conditions along a Taub adiabat is used to simulate the entropy production. Different dynamical criteria to determine the final entropy-per-baryon number are investigated and matched to a hadron resonance gas model along the chemical freeze out curve to obtain the final pion and proton numbers. We detect a strong enhancement of their multiplicity ratio at the energies where the system experiences a strong phase transition as compared to a smooth crossover which shows almost no enhancement.

    Comments:
    6 pages, 4 figures
    Subjects:
    Nuclear Theory (nucl-th); High Energy Physics — Phenomenology (hep-ph)
    arXiv:
    2209.04096 [pdf]
    PLB(2022)·7 citations
  3. 03

    [Submitted on 9 Sept 2022]

    Interplay between core and corona from small to large systems

    Yuuka Kanakubo🇯🇵 · Yasuki Tachibana🇯🇵 · Tetsufumi Hirano🇯🇵

    We present new results in + and Pb+Pb collisions at the LHC energies from the updated dynamical core--corona initialization framework (DCCI2). The fractions of final hadron yields originating from equilibrated and non-equilibrated components are extracted as functions of multiplicity. We find that the contributions from non-equilibrated components are non-negligible even in Pb+Pb collisions and affect -integrated multi-particle correlations. These suggest the importance of non-equilibrated components for the sophisticated extraction of properties of the quark gluon plasma from comparisons between dynamical frameworks and experimental data.

    Comments:
    4 pages, 2 figures, contribution to the proceedings of the 20th International Conference on Strangeness in Quark Matter (SQM2022)
    Subjects:
    Nuclear Theory (nucl-th); Nuclear Experiment (nucl-ex)
    arXiv:
    2209.04110 [pdf]
    EPJ Web Conf.(2023)·3 citations
  4. 04

    [Submitted on 9 Sept 2022]

    Interactions between heavy quarks and tilted QGP fireballs in 200 AGeV Au+Au collisions

    Ze-Fang Jiang🇨🇳 · Shanshan Cao🇨🇳 · Wen-Jing Xing🇨🇳 · Xiaowen Li🇨🇳 · Ben-Wei Zhang🇨🇳

    Heavy quark observables are applied to probe the initial energy density distribution with violation of longitudinal boost invariance produced in relativistic heavy-ion collisions. Using an improved Langevin model coupled to a (3+1)-dimensional viscous hydrodynamic model, we study the nuclear modification factor (), directed flow () and elliptic flow () coefficients of heavy mesons and their decayed electrons at the RHIC energy. We find that the counter-clockwise tilt of the nuclear matter in the reaction plane results in a positive (negative) heavy flavor in the backward (forward) rapidity region, whose magnitude increases with the heavy quark transverse momentum. The difference in the heavy flavor between different angular regions is also proposed as a complementary tool to characterize the asymmetry of the medium profile. Our model results are consistent with currently available data at RHIC and provide predictions that can be tested by future measurements.

    Comments:
    10 pages, 6 figures, comments are welcome
    Subjects:
    Nuclear Theory (nucl-th); Nuclear Experiment (nucl-ex)
    arXiv:
    2209.04143 [pdf]
    CPC(2023)·3 citations

Affiliations

first authorsco-authorsvia INSPIRE