Photoproduction of low-pT J/ψ from peripheral to central Pb−Pb collisions at 5.02 TeV
- 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.
| URN: | urn:nbn:de:hebis:30:3-795342 |
|---|---|
| URL: | https://arxiv.org/abs/2204.10684v1 |
| DOI: | https://doi.org/10.48550/arXiv.2204.10684 |
| ArXiv Id: | http://arxiv.org/abs/2204.10684v1 |
| Parent Title (English): | arXiv |
| Series (Serial Number): | CERN Report (CERN-EP-2022-071) |
| Publisher: | arXiv |
| Document Type: | Preprint |
| Language: | English |
| Date of Publication (online): | 2022/04/22 |
| Date of first Publication: | 2022/04/22 |
| Publishing Institution: | Universitätsbibliothek Johann Christian Senckenberg |
| Creating Corporation: | ALICE (Körperschaft) |
| Release Date: | 2023/11/30 |
| Issue: | 2204.10684 Version 1 |
| Edition: | Version 1 |
| Page Number: | 15 |
| HeBIS-PPN: | 513996265 |
| Institutes: | Physik / Physik |
| Informatik und Mathematik / Informatik | |
| Wissenschaftliche Zentren und koordinierte Programme / Frankfurt Institute for Advanced Studies (FIAS) | |
| Dewey Decimal Classification: | 5 Naturwissenschaften und Mathematik / 53 Physik / 530 Physik |
| Sammlungen: | Universitätspublikationen |
| Licence (German): |  Creative Commons - Namensnennung 4.0 |
