Photoproduction of low-pT J/ψ from peripheral to central Pb-Pb collisions at 5.02 TeV



Acharya, S, Adamova, D, Adler, A, Rinella, G Aglieri, Agnello, M, Agrawal, N, Ahammed, Z, Ahmad, S, Ahn, SU, Ahuja, I
et al (show 1022 more authors) (2023) Photoproduction of low-pT J/ψ from peripheral to central Pb-Pb collisions at 5.02 TeV PHYSICS LETTERS B, 846. p. 137467. ISSN 0370-2693, 1873-2445

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Abstract

An excess of J/ψ yield at very low transverse momentum (p<inf>T</inf><0.3 GeV/c), originating from coherent photoproduction, is observed in peripheral and semicentral hadronic Pb–Pb collisions at a center-of-mass energy per nucleon pair of s<inf>NN</inf>=5.02 TeV. The measurement is performed with the ALICE detector via the dimuon decay channel at forward rapidity (2.5<y<4). The nuclear modification factor at very low p<inf>T</inf> and the coherent photoproduction cross section are measured as a function of centrality down to the 10% most central collisions. These results extend the previous study at s<inf>NN</inf>=2.76 TeV, confirming the clear excess over hadronic production in the p<inf>T</inf> range 0−0.3 GeV/c and the centrality range 70–90%, and establishing an excess with a significance greater than 5σ also in the 50–70% and 30–50% centrality ranges. The results are compared with earlier measurements at s<inf>NN</inf>=2.76 TeV and with different theoretical predictions aiming at describing how coherent photoproduction occurs in hadronic interactions with nuclear overlap.

Item Type: Article
Uncontrolled Keywords: 5106 Nuclear and Plasma Physics, 5107 Particle and High Energy Physics, 5110 Synchrotrons and Accelerators, 51 Physical Sciences
Depositing User: Symplectic Admin
Date Deposited: 13 Aug 2024 14:40
Last Modified: 23 May 2026 07:56
DOI: 10.1016/j.physletb.2022.137467
Open Access URL: https://doi.org/10.1016/j.physletb.2022.137467
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URI: https://livrepository.liverpool.ac.uk/id/eprint/3183693
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