A1 Journal article (refereed)
Prompt and non-prompt J/ψ production at midrapidity in Pb–Pb collisions at √sNN = 5.02 TeV (2024)


ALICE Collaboration. (2024). Prompt and non-prompt J/ψ production at midrapidity in Pb–Pb collisions at √sNN = 5.02 TeV. Journal of High Energy Physics, 2024(2), Article 66. https://doi.org/10.1007/JHEP02(2024)066


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Publication details

All authors or editors: ALICE Collaboration

Journal or series: Journal of High Energy Physics

ISSN: 1126-6708

eISSN: 1029-8479

Publication year: 2024

Publication date: 09/02/2024

Volume: 2024

Issue number: 2

Article number: 66

Publisher: Springer Science and Business Media LLC

Publication country: Germany

Publication language: English

DOI: https://doi.org/10.1007/JHEP02(2024)066

Publication open access: Openly available

Publication channel open access: Open Access channel

Publication is parallel published (JYX): https://jyx.jyu.fi/handle/123456789/94838

Publication is parallel published: https://arxiv.org/abs/2308.16125


Abstract

The transverse momentum (pT) and centrality dependence of the nuclear modification factor RAA of prompt and non-prompt J/ψ, the latter originating from the weak decays of beauty hadrons, have been measured by the ALICE collaboration in Pb−Pb collisions at √sNN = 5.02 TeV. The measurements are carried out through the e+e− decay channel at midrapidity (|y|<0.9) in the transverse momentum region 1.5<10 GeV/c. Both prompt and non-prompt J/ψ measurements indicate a significant suppression for pT> 5 GeV/c, which becomes stronger with increasing collision centrality. The results are consistent with similar LHC measurements in the overlapping pT intervals, and cover the kinematic region down to pT = 1.5 GeV/c at midrapidity, not accessible by other LHC experiments. The suppression of prompt J/ψ in central and semicentral collisions exhibits a decreasing trend towards lower transverse momentum, described within uncertainties by models implementing J/ψ production from recombination of c and c¯¯ quarks produced independently in different partonic scatterings. At high transverse momentum, transport models including quarkonium dissociation are able to describe the suppression for prompt J/ψ. For non-prompt J/ψ, the suppression predicted by models including both collisional and radiative processes for the computation of the beauty-quark energy loss inside the quark−gluon plasma is consistent with measurements within uncertainties.


Keywords: particle physics; nuclear physics; quark-gluon plasma


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Ministry reporting: Yes

Reporting Year: 2024

Preliminary JUFO rating: 3


Last updated on 2024-15-05 at 11:31