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

Autori
Acharya, S. ; ... ; Antičić, Tome ; ... ; Erhardt, Filip ; ... ; Gotovac, Sven ; ... ; Jerčić, Marko ; ... ; Lončar, Petra ; ... ; Mudnić, Eugen ; ... ; Planinić, Mirko ; ... ; Poljak, Nikola ; ... ; Simatović, Goran ; ... ; Utrobičić, Antonija ; ... ; Vicković, Linda ; ... ; Zurlo, N.

Kolaboracija
ALICE Collaboration

Izvornik
Physics letters. B (0370-2693) 798 (2019); 134926, 14

Vrsta, podvrsta i kategorija rada
Radovi u časopisima, članak, znanstveni

Ključne riječi
J/ψ ; photoproduction ; ultra-peripheral ; Pb–Pb

Sažetak
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 √sNN=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 −1 . 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′ to J/ψ coherent photoproduction cross sections was measured and found to be consistent with that measured for photoproduction off protons.

Izvorni jezik
Engleski

Znanstvena područja
Fizika

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