Centrality and transverse momentum dependence of inclusive J/ψ production at midrapidity in Pb-Pb collisions at √s NN=5 .02 TeV



Acharya, S, Adamova, D, Adler, A, Adolfsson, J, Aggarwal, MM, Rinella, G Aglieri, Agnello, M, Agrawal, N, Ahammed, Z, Ahmad, S
et al (show 987 more authors) (2020) Centrality and transverse momentum dependence of inclusive J/ψ production at midrapidity in Pb-Pb collisions at √s NN=5 .02 TeV PHYSICS LETTERS B, 805. 135434-. ISSN 0370-2693, 1873-2445

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Abstract

The inclusive J/ψ meson production in Pb–Pb collisions at a center-of-mass energy per nucleon–nucleon collision of s<inf>NN</inf>=5.02 TeV at midrapidity (|y|<0.9) is reported by the ALICE Collaboration. The measurements are performed in the dielectron decay channel, as a function of event centrality and J/ψ transverse momentum p<inf>T</inf>, down to p<inf>T</inf>=0. The J/ψ mean transverse momentum 〈p<inf>T</inf>〉 and r<inf>AA</inf> ratio, defined as 〈p<inf>T</inf> <sup>2</sup>〉<inf>PbPb</inf>/〈p<inf>T</inf> <sup>2</sup>〉<inf>pp</inf>, are evaluated. Both observables show a centrality dependence decreasing towards central (head-on) collisions. The J/ψ nuclear modification factor R<inf>AA</inf> exhibits a strong p<inf>T</inf> dependence with a large suppression at high p<inf>T</inf> and an increase to unity for decreasing p<inf>T</inf>. When integrating over the measured momentum range p<inf>T</inf><10 GeV/c, the J/ψ R<inf>AA</inf> shows a weak centrality dependence. Each measurement is compared with results at lower center-of-mass energies and with ALICE measurements at forward rapidity, as well as to theory calculations. All reported features of the J/ψ production at low p<inf>T</inf> are consistent with a dominant contribution to the J/ψ yield originating from charm quark (re)combination.

Item Type: Article
Uncontrolled Keywords: 5106 Nuclear and Plasma Physics, 5107 Particle and High Energy Physics, 51 Physical Sciences
Divisions: Faculty of Science & Engineering > School of Physical Sciences
Depositing User: Symplectic Admin
Date Deposited: 10 Sep 2021 14:27
Last Modified: 16 Jun 2026 14:11
DOI: 10.1016/j.physletb.2020.135434
Open Access URL: https://doi.org/10.1016/j.physletb.2020.135434
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URI: https://livrepository.liverpool.ac.uk/id/eprint/3136651
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