Coherent J/ψ photoproduction at forward rapidity in ultra-peripheral Pb-Pb collisions at √sNN=5.02 TeV



Acharya, S, Adamova, D, Adhya, SP, Adler, A, Adolfsson, J, Aggarwal, MM, Rinella, G Aglieri, Agnello, M, Agrawal, N, Ahammed, Z
et al (show 1010 more authors) (2019) Coherent J/ψ photoproduction at forward rapidity in ultra-peripheral Pb-Pb collisions at √sNN=5.02 TeV PHYSICS LETTERS B, 798. 134926-. ISSN 0370-2693, 1873-2445

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Abstract

The ALICE collaboration performed the first rapidity-differential measurement of coherent J/ψ photoproduction in ultra-peripheral Pb–Pb collisions at a center-of-mass energy s<inf>NN</inf>=5.02 TeV. The J/ψ is detected via its dimuon decay in the forward rapidity region (−4.0<y<−2.5) for events where the hadronic activity is required to be minimal. The analysis is based on an event sample corresponding to an integrated luminosity of about 750 μb<sup>−1</sup>. The cross section for coherent J/ψ production is presented in six rapidity bins. The results are compared with theoretical models for coherent J/ψ photoproduction. These comparisons indicate that gluon shadowing effects play a role in the photoproduction process. The ratio of ψ<sup>′</sup> to J/ψ coherent photoproduction cross sections was measured and found to be consistent with that measured for photoproduction off protons.

Item Type: Article
Uncontrolled Keywords: 5106 Nuclear and Plasma Physics, 5107 Particle and High Energy Physics, 51 Physical Sciences
Depositing User: Symplectic Admin
Date Deposited: 04 Dec 2019 15:45
Last Modified: 16 Jun 2026 13:48
DOI: 10.1016/j.physletb.2019.134926
Open Access URL: https://doi.org/10.1016/j.physletb.2019.134926
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URI: https://livrepository.liverpool.ac.uk/id/eprint/3064814
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