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Nuclear Theory·nucl-th

Tuesday·January 31, 2023

13 papers—4 primary·9 cross-listed

All13Primary4Cross-lists9
  1. 01

    [Submitted on 28 Jan 2023]

    Difference between signal and background of the chiral magnetic effect relative to spectator and participant planes in isobar collisions at GeV

    Bang-Xiang Chen🇨🇳 · Xin-Li Zhao🇨🇳 · Guo-Liang Ma🇨🇳

    The search for the chiral magnetic effect (CME) in relativistic heavy-ion collisions helps us understand the symmetry breaking in strong interactions and the topological nature of the QCD vacuum. Since the background and signal of the CME have different correlations with the spectator and participant planes, a two-plane method has been proposed to extract the fraction of the CME signal inside the CME observable of from the experimental measurements relative to the two planes. Using a multiphase transport model with different strengths of the CME, we reexamine the two-plane method in isobar collisions at GeV. The ratios of the CME signals and the elliptic flow backgrounds relative to the two different planes are found to be different, which is inconsistent with the assumptions made in the current experimental measurements. This difference arises from the decorrelation effect of the chiral magnetic effect relative to the spectator and participant planes caused by final state interactions. Our finding suggests that the current experimental measurements may overestimate the fraction of the CME signal in the CME observable in the final state of relativistic heavy-ion collisions.

    Comments:
    9 pages, 10 figures, final published version
    Subjects:
    Nuclear Theory (nucl-th); High Energy Physics — Phenomenology (hep-ph); Nuclear Experiment (nucl-ex)
    arXiv:
    2301.12076 [pdf]
    PRC(2024)·9 citations
  2. 02

    [Submitted on 30 Jan 2023]

    High-Density behavior of symmetry energy and speed of sound in the dense matter within an effective chiral model

    Prashant Thakur🇮🇳 · N.K. Patra🇮🇳 · T.K. Jha🇮🇳 · Tuhin Malik🇵🇹

    With an effective chiral model, we investigate how the mesonic cross couplings and affect the density content of the symmetry energy and its higher-order slope parameters. Earlier mentioned cross-couplings are crucial to controlling the density content of symmetry energy. For this purpose, we did a case study for different values of the symmetry energy , defined at density 0.1 fm in the range (23.4 - 25.2) for a fixed value of the slope of the symmetry energy MeV at saturation density and investigate its effect on the higher-order coefficients and their influence on the underlying equation of state. We found that the model with MeV is more favorable with the pure neutron matter (PNM) constraints obtained from EFT calculations. In addition, we show that all of our models predict a monotonically increasing speed of sound up to four times the saturation density. The speed of sound decreases/saturates above that point and approaches the conformal limit approximately at the center of the maximum mass star.

    Comments:
    The manuscript contain 9 figures and 2 tables
    Subjects:
    Nuclear Theory (nucl-th)
    arXiv:
    2301.12690 [pdf]
    0 citations
  3. 03

    [Submitted on 30 Jan 2023]

    A new dynamical mechanism of incomplete fusion in heavy-ion collision

    A.K. Nasirov (1,2) · B.M. Kayumov (2,3) · O.K. Ganiev (2,4,5) · G.A. Yuldasheva (2) ((1) Joint Institute for Nuclear Research, Dubna, Russia, (2) Institute of Nuclear Physics, Uzbekistan Academy of Sciences, Tashkent, (3) New Uzbekistan University, Tashkent, Uzbekistan, (4) School of Engineering, Akfa University, Tashkent, Uzbekistan, (5) Faculty of Physics, National University of Uzbekistan, 100174 Tashkent, Uzbekistan)

    The incomplete fusion has been proved as the formation and emission of the particle by the increase in the rotational energy of the very mass-asymmetric dinuclear system. The results of the dinuclear system model have confirmed that the incomplete fusion in heavy-ion collisions occurs at a large orbital angular momentum () due to the strong increase of the intrinsic fusion barrier.

    Comments:
    6 pages, 11 figures
    Subjects:
    Nuclear Theory (nucl-th); Nuclear Experiment (nucl-ex)
    arXiv:
    2301.12691 [pdf]
    PLB(2023)·16 citations
  4. 04

    [Submitted on 30 Jan 2023]

    Renormalization of nuclear chiral effective field theory with non-perturbative leading order interactions

    A. M. Gasparyan🇩🇪 · E. Epelbaum🇩🇪

    We extend the renormalizability study of the formulation of chiral effective field theory with a finite cutoff, applied to nucleon-nucleon scattering, by taking into account non-perturbative effects. We consider the nucleon-nucleon interaction up to next-to-leading order in the chiral expansion. The leading-order interaction is treated non-perturbatively. In contrast to the previously considered case when the leading-order interaction was assumed to be perturbative, new features related to the renormalization of the effective field theory are revealed. In particular, more severe constraints on the leading-order potential are formulated, which can enforce the renormalizability and the correct power counting for the next-to-leading order amplitude. To illustrate our theoretical findings, several partial waves in the nucleon-nucleon scattering, , and are analyzed numerically. The cutoff dependence and the convergence of the chiral expansion for those channels are discussed.

    Comments:
    44 pages, 5 figures
    Subjects:
    Nuclear Theory (nucl-th); High Energy Physics — Phenomenology (hep-ph)
    arXiv:
    2301.13032 [pdf]
    PRC(2023)·15 citations

Affiliations

first authorsco-authorsvia INSPIRE