Observation of sequential Υ suppression in Au+Au collisions at √sNN = 200 GeV with the STAR experiment
- We report on measurements of sequential Υ suppression in Au+Au collisions at √sNN = 200 GeV with the STAR detector at the Relativistic Heavy Ion Collider (RHIC) through both the di-electron and di-muon channels. In the 0-60% centrality class, the nuclear modification factors (RAA), which quantify the level of yield suppression in heavy-ion collisions compared to p+p collisions, for Υ(1S) and Υ(2S) are 0.40±0.03 (stat.)±0.03 (sys.)±0.07 (norm.) and 0.26±0.07 (stat.)±0.02 (sys.)±0.04 (norm.), respectively, while the upper limit of the Υ(3S) RAA is 0.20 at a 95% confidence level. This observation provides experimental evidence that the Υ(3S) is significantly more suppressed than the Υ(1S) at RHIC. The level of suppression for Υ(1S) is comparable to that observed at the much higher collision energy at the Large Hadron Collider. These results point to the creation of a deconfined medium at RHIC whose temperature is sufficiently high to strongly suppress excited Υ states.
| URN: | urn:nbn:de:hebis:30:3-848869 |
|---|---|
| URL: | https://arxiv.org/abs/2207.06568v1 |
| DOI: | https://doi.org/10.48550/ARXIV.2207.06568 |
| ArXiv Id: | http://arxiv.org/abs/2207.06568v1 |
| Parent Title (English): | arXiv |
| Publisher: | arXiv |
| Document Type: | Preprint |
| Language: | English |
| Date of Publication (online): | 2022/07/14 |
| Date of first Publication: | 2022/07/14 |
| Publishing Institution: | Universitätsbibliothek Johann Christian Senckenberg |
| Creating Corporation: | STAR Collaboration |
| Release Date: | 2024/08/14 |
| Tag: | STAR; heavy-ion collisions; Υ suppression |
| Issue: | 2207.06568v1 |
| Edition: | Version 1 |
| Page Number: | 7 |
| 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 |
