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. p. 135434.

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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 sNN=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 pT, down to pT=0. The J/ψ mean transverse momentum 〈pT〉 and rAA ratio, defined as 〈pT2〉PbPb/〈pT2〉pp, are evaluated. Both observables show a centrality dependence decreasing towards central (head-on) collisions. The J/ψ nuclear modification factor RAA exhibits a strong pT dependence with a large suppression at high pT and an increase to unity for decreasing pT. When integrating over the measured momentum range pT<10 GeV/c, the J/ψ RAA 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 pT are consistent with a dominant contribution to the J/ψ yield originating from charm quark (re)combination.

Item Type: Article
Uncontrolled Keywords: Brain Disorders
Divisions: Faculty of Science and Engineering > School of Physical Sciences
Depositing User: Symplectic Admin
Date Deposited: 10 Sep 2021 14:27
Last Modified: 06 Jun 2024 19:12
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