Observation of strong nuclear suppression in exclusive J/ψ photoproduction in Au+Au ultra-peripheral collisions at RHIC
- We report a measurement of exclusive J/ψ photoproduction in Au+Au ultra-peripheral collisions at sNN−−−√=200 GeV using the STAR detector. For the first time, i) the rapidity correlation between J/ψ photoproduction and neutron emission from nuclear breakups has been experimentally measured; ii) nuclear suppression factors are measured for both the coherent and incoherent J/ψ production. At photon-nucleon center-of-mass energy of 25.0 GeV, the coherent and incoherent J/ψ cross sections of Au nuclei are found to be 71±10% and 36±7%, respectively, of that of free protons. The stronger suppression observed in the incoherent production provides a new experimental handle to study the initial-state parton density in heavy nuclei. Data are compared with theoretical models quantitatively.
| URN: | urn:nbn:de:hebis:30:3-861856 |
|---|---|
| URL: | https://arxiv.org/abs/2311.13637v2 |
| DOI: | https://doi.org/10.48550/ARXIV.2311.13637 |
| ArXiv Id: | http://arxiv.org/abs/2311.13637v2 |
| Parent Title (English): | arXiv |
| Publisher: | arXiv |
| Document Type: | Preprint |
| Language: | English |
| Date of Publication (online): | 2023/11/27 |
| Date of first Publication: | 2023/11/27 |
| Publishing Institution: | Universitätsbibliothek Johann Christian Senckenberg |
| Creating Corporation: | STAR Collaboration |
| Release Date: | 2024/07/10 |
| Tag: | nuclear parton modification; ultra-peripheral collision; vector meson production |
| Issue: | 2311.13637v2 |
| Edition: | Version 2 |
| Page Number: | 6 |
| Institutes: | 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 - CC BY-NC-ND - Namensnennung - Nicht kommerziell - Keine Bearbeitungen 4.0 International |
