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Acharya, S.; Adler, A.; Ali, Y.; Andreou, D.; Antinori, F.; Antonioli, P.; Bagnasco, S.; Barioglio, L.; Barnaföldi, G.G.; Batyunya, B.; Batzing, P.C.; Bhat, I.R.; Bianchi, A.; Bielčíková, J.; Biro, G.; Biswas, R.; Blair, J.T.; Bonomi, G.; Chapeland, S.; Chattopadhyay, S.; Chauvin, A.; Chibante Barroso, V.; Cuautle, E.; de Cuveland, J.; Dmitrieva, U.; Finogeev, D.; Fiorenza, G.; Francisco, A.; Fuchs, U.; Furs, A.; Garabatos, C.; Ghosh, S.K.; Gorbunov, S.; Gotovac, S.; Grabski, V.; Grosso, R.; Guittiere, M.; Habib, M.K.; Hannigan, R.; Hilden, T.E.; Hippolyte, B.; Humanic, T.J.; Jacobs, P.M.; Khan, A.M.; Kim, D.J.; Klein, S.; Kovalenko, O.; Kryshen, E.; Kurepin, A.B.; Kweon, M.J.; Kwon, J.Y.; Kwon, Y.; Lemmon, R.C.; Lisa, M.A.; Loncar, P.; Luettig, P.; Malzacher, P.; Mareš, J.; Marquard, M.; Mayer, C.; Mazzoni, M.A.; Miake, Y.; Mischke, A.; Ortiz Velasquez, A.; Pareek, P.; Pereira, L.G.; Poppenborg, H.; Prasad, S.K.; Ragoni, S.; Rehman, A.; Reichelt, P.; Reshetin, A.; Richert, T.; Rohr, D.; Ronchetti, F.; Rosas, E.D.; Rosnet, P.; Rytkonen, H.; Saha, S.K.; Schwarz, K.; Serradilla, E.; Singhal, V.; Slupecki, M.; Sorensen, S.; Stankus, P.; Steffanic, P.J.; Storetvedt, M.M.; Suire, C.; Thoresen, F.; Tieulent, R.; Toia, A.; Tripathy, S.; Vértesi, R.; Voscek, D.; Weber, M.; Weber, S.G.; Westerhoff, U.; Wilk, G.; Zhang, Z.; Zimmermann, M.B.
Physics letters. B, 11/2019, Volume: 798Journal Article
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.
