TY  - INPR
T1  - Observation of sequential Υ suppression in Au+Au collisions at √sNN = 200 GeV with the STAR experiment
T2  - arXiv
N2  - 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.
KW  - STAR
KW  - heavy-ion collisions
KW  - Υ suppression
Y1  - 2022
UR  - http://publikationen.ub.uni-frankfurt.de/frontdoor/index/index/docId/84886
UR  - https://nbn-resolving.org/urn:nbn:de:hebis:30:3-848869
UR  - https://arxiv.org/abs/2207.06568v1
IS  - 2207.06568v1
PB  - arXiv
ER  -