TY  - INPR
T1  - Photoproduction of low-pT J/ψ from peripheral to central Pb−Pb collisions at 5.02 TeV
T2  - arXiv
N2  - An excess of J/ψ yield at very low transverse momentum (pT<0.3 GeV/c), originating from coherent photoproduction, is observed in peripheral and semicentral hadronic Pb−Pb collisions at a center-of-mass energy per nucleon pair of √sNN=5.02 TeV. The measurement is performed with the ALICE detector via the dimuon decay channel at forward rapidity (2.5<y<4). The nuclear modification factor at very low pT and the coherent photoproduction cross section are measured as a function of centrality down to the 10% most central collisions. These results extend the previous study at √sNN=2.76 TeV, confirming the clear excess over hadronic production in the pT range 0−0.3 GeV/c and the centrality range 70−90%, and establishing an excess with a significance greater than 5σ also in the 50−70% and 30−50% centrality ranges. The results are compared with earlier measurements at √sNN=2.76 TeV and with different theoretical predictions aiming at describing how coherent photoproduction occurs in hadronic interactions with nuclear overlap.
T3  - CERN Report - CERN-EP-2022-071 
Y1  - 2022
UR  - http://publikationen.ub.uni-frankfurt.de/frontdoor/index/index/docId/79534
UR  - https://nbn-resolving.org/urn:nbn:de:hebis:30:3-795342
UR  - https://arxiv.org/abs/2204.10684v1
IS  - 2204.10684 Version 1
PB  - arXiv
ER  -