Measurement of Sequential Υ Suppression in Au+Au Collisions at √s.sub.NN./sub.=200 GeV with the STAR Experiment

0572476 - ÚJF 2024 RIV US eng J - Journal Article
Aboona, B. E. - Adam, J. - Adamczyk, L. - Adams, J. R. - Bielčík, J. - Bielčíková, Jana - Češka, J. - Das, A. - Holub, L. - Chaloupka, P. - Kosarzewski, L. K. - Kramárik, L. - Líčeník, Robert - Lomnický, O. - Prozorova, V. - Robotková, Monika - Šumbera, Michal - Truhlář, T. - Trzeciak, B. A. … Total 359 authors
Measurement of Sequential Υ Suppression in Au+Au Collisions at √s_NN=200 GeV with the STAR Experiment.
Physical Review Letters. Roč. 130, č. 11 (2023), č. článku 112301. ISSN 0031-9007. E-ISSN 1079-7114
Research Infrastructure: BNL-CZ III - 90234
Institutional support: RVO:61389005
Keywords : STAR collaboration * heavy ion experiment
OECD category: Particles and field physics
Impact factor: 8.6, year: 2022
Method of publishing: Limited access
https://doi.org/10.1103/PhysRevLett.130.112301

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 dielectron and dimuon decay 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)±0.09(norm) and 0.26±0.08(stat)±0.02(sys)±0.06(norm), respectively, while the upper limit of the Υ(3S) RAA is 0.17 at a 95% confidence level. This provides experimental evidence that the Υ(3S) is significantly more suppressed than the Υ(1S) at RHIC. The level of suppression or 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 medium at RHIC whose temperature is sufficiently high to strongly suppress excited Υ states.
Permanent Link: https://hdl.handle.net/11104/0343135