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<−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.

Acharya S., Adamova D., Adhya S.P., Adler A., Adolfsson J., Aggarwal M.M., et al. (2019). Coherent J/ψphotoproduction at forward rapidity in ultra-peripheral Pb–Pb collisions at √sNN=5.02 TeV. PHYSICS LETTERS. SECTION B, 798, 1-14 [10.1016/j.physletb.2019.134926].

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

Alici A.;Arcelli S.;Bellini F.;Carnesecchi F.;Cifarelli L.;Colocci M.;Jacazio N.;Scioli G.;
2019

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 √sNN=5.02 TeV. The J/ψ is detected via its dimuon decay in the forward rapidity region (−4.0<−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.
2019
Acharya S., Adamova D., Adhya S.P., Adler A., Adolfsson J., Aggarwal M.M., et al. (2019). Coherent J/ψphotoproduction at forward rapidity in ultra-peripheral Pb–Pb collisions at √sNN=5.02 TeV. PHYSICS LETTERS. SECTION B, 798, 1-14 [10.1016/j.physletb.2019.134926].
Acharya S.; Adamova D.; Adhya S.P.; Adler A.; Adolfsson J.; Aggarwal M.M.; Aglieri Rinella G.; Agnello M.; Agrawal N.; Ahammed Z.; Ahmad S.; Ahn S.U.;...espandi
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