| Title: |
Coherent J/ψ photoproduction at midrapidity in Pb−Pb collisions at s√NN=5.02 TeV |
| Authors: |
ALICE Collaboration; Sub GRASP; Dep Natuurkunde; Gravitational and Subatomic Physics (GRASP) |
| Publication Year: |
2025 |
| Subject Terms: |
Charmonium; Coherent photoproduction; Ultra peripheral heavy-ion collisions; Nuclear and High Energy Physics |
| Description: |
The coherent J/ ψ photoproduction cross section is measured for the first time at midrapidity in peripheral to semicentral Pb−Pb collisions at sNN=5.02 TeV. The centrality differential cross section d σ /d y is reported for the centrality range 40–90%, together with the doubly-differential cross section d2 σ /d y d p T, extracted in two peripheral centrality classes. The J/ ψ mesons are reconstructed in the dielectron channel, in the rapidity interval | y | < 0.9 using the ALICE central barrel detectors. The J/ ψ cross section at midrapidity is statistically compatible to the earlier ALICE measurement at forward rapidity and at the same centre-of-mass energy, and shows only a mild centrality dependence over the covered range. Several sets of theoretical calculations taking into account the hadronic overlap in the collisions but ignoring possible final-state effects from a hot expanding medium are found to give a fairly good description of the current measurements within uncertainties. |
| Document Type: |
manuscript |
| File Description: |
application/pdf |
| Language: |
English |
| ISSN: |
0370-2693 |
| Relation: |
https://dspace.library.uu.nl/handle/1874/480006 |
| Availability: |
https://dspace.library.uu.nl/handle/1874/480006 |
| Rights: |
info:eu-repo/semantics/OpenAccess |
| Accession Number: |
edsbas.E05A8296 |
| Database: |
BASE |