Detecting nuclear mass distribution in isobar collisions via charmonium

Jiaxing Zhao; Shuzhe Shi

doi:10.1140/epjc/s10052-023-11657-x

2023 Impact factor 4.2

Particles and Fields

Open Access

Eur. Phys. J. C (2023) 83: 511
https://doi.org/10.1140/epjc/s10052-023-11657-x

Regular Article - Theoretical Physics

Detecting nuclear mass distribution in isobar collisions via charmonium

Jiaxing Zhao¹^,2^a and Shuzhe Shi¹^,3

¹ Physics Department, Tsinghua University, 100084, Beijing, China
² SUBATECH, Université de Nantes, IMT Atlantique, IN2P3/CNRS, 4 rue Alfred Kastler, 44307, Nantes Cedex 3, France
³ Department of Physics and Astronomy, Center for Nuclear Theory, Stony Brook University, 11794-3800, Stony Brook, NY, USA

^a jzhao@subatech.in2p3.fr

Received: 7 February 2023
Accepted: 22 May 2023
Published online: 15 June 2023

Abstract

The collective properties of final state hadrons produced in the high statistics $_{44}^{96}$ $_{44}^{96}$ Ru + $_{44}^{96}$ $_{44}^{96}$ Ru and $_{40}^{96}$ $_{40}^{96}$ Zr + $_{40}^{96}$ $_{40}^{96}$ Zr collisions at $\sqrt{s_{NN}} = 200 GeV$ $\sqrt{s_\textrm{NN}} = 200~\textrm{GeV}$ are found to be significantly different. Such differences were argued to be precise probes of the difference in nucleon distribution in the isobar nuclei. We investigate the $J / ψ$ $J/\psi$ production in the isobar collision via a relativistic transport approach. By comparing the isobar systems according to equal centrality bin and equal multiplicity bin, we find that the yield ratio of $J / ψ$ $J/\psi$ is sensitive to the differences in both the number of binary collisions and the medium evolution. Besides, the elliptic flow $v_{2}$ $$v_2$$ of $J / ψ$ $J/\psi$ is qualitatively different from the light hadrons, and the ratio between Ru + Ru and Zr + Zr collisions is sensitive to the medium evolution. The charmonium production provides an independent probe to study the nucleon distribution in the isobar system.

© The Author(s) 2023

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