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Opis bibliograficzny

Coherent $J/\psi$ and $\psi'$ photoproduction at midrapidity in ultra-peripheral Pb-Pb collisions at $\sqrt{s_{NN}}=5.02$ TeV / S. Acharya, [et al.], P. J. KONOPKA, [et al.], S. D. KORYCIAK, [et al.] // The European Physical Journal. C, Particles and Fields ; ISSN 1434-6044. — 2021 — vol. 81 iss. 8 art. no. 712, s. 1–21. — Bibliogr. s. 14–16, Abstr. — Publikacja dostępna online od: 2021-08-09. — P. J. Konopka - dod. afiliacja: European Organization for Nuclear Research (CERN), Geneva, Switzerland

Autorzy (1007)

Dane bibliometryczne

ID BaDAP	136822
Data dodania do BaDAP	2021-10-06
Tekst źródłowy	URL
DOI	10.1140/epjc/s10052-021-09437-6
Rok publikacji	2021
Typ publikacji	artykuł w czasopiśmie
Otwarty dostęp
Creative Commons
Czasopismo/seria	European Physical Journal, C

Abstract

The coherent photoproduction of J/psi and psi' mesons was measured in ultra-peripheral Pb-Pb collisions at a center-of-mass energy root s(NN) = 5.02 TeV with the ALICE detector. Charmonia are detected in the central rapidity region for events where the hadronic interactions are strongly suppressed. The J/psi is reconstructed using the dilepton (l(+)l(-)) and proton-antiproton decay channels, while for the psi' the dilepton and the l(+)l(-) pi(+)pi(-) decay channels are studied. The analysis is based on an event sample corresponding to an integrated luminosity of about 233 mu b(-1). The results are compared with theoretical models for coherent J/psi and psi' photoproduction. The coherent cross section is found to be in a good agreement with models incorporating moderate nuclear gluon shadowing of about 0.64 at a Bjorken-x of around 6 x 10(-4), such as the EPS09 parametrization, however none of the models is able to fully describe the rapidity dependence of the coherent J/psi cross section including ALICE measurements at forward rapidity. The ratio of psi' to J/psi coherent photoproduction cross sections was also measured and found to be consistent with the one for photoproduction off protons.

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