$Measurement of Sequential ϒ Suppression in Au+Au Collisions at sqrt[s_{NN}]=200 GeV with the STAR Experiment$

Measurement of Sequential ϒ Suppression in Au+Au Collisions at sqrt[s_{NN}]=200 GeV with the STAR Experiment

We report on measurements of sequential ϒ suppression in Au+Au collisions at sqrt[s_{NN}]=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 (R_{AA}), wh...

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Veröffentlicht in:	Physical review letters 2023-03, Vol.130 (11), p.112301-112301
Hauptverfasser:	Aboona, B E, Adam, J, Adamczyk, L, Adams, J R, Aggarwal, I, Aggarwal, M M, Ahammed, Z, Anderson, D M, Aschenauer, E C, Atchison, J, Bairathi, V, Baker, W, Ball Cap, J G, Barish, K, Bellwied, R, Bhagat, P, Bhasin, A, Bhatta, S, Bielcik, J, Bielcikova, J, Brandenburg, J D, Cai, X Z, Caines, H, Calderón de la Barca Sánchez, M, Cebra, D, Ceska, J, Chakaberia, I, Chaloupka, P, Chan, B K, Chang, Z, Chen, D, Chen, J, Chen, J H, Chen, Z, Cheng, J, Cheng, Y, Choudhury, S, Christie, W, Chu, X, Crawford, H J, Csanád, M, Dale-Gau, G, Das, A, Daugherity, M, Deppner, I M, Dhamija, A, Di Carlo, L, Didenko, L, Dixit, P, Dong, X, Drachenberg, J L, Duckworth, E, Dunlop, J C, Engelage, J, Eppley, G, Esumi, S, Evdokimov, O, Ewigleben, A, Eyser, O, Fatemi, R, Fazio, S, Feng, C J, Feng, Y, Finch, E, Fisyak, Y, Flor, F A, Fu, C, Gagliardi, C A, Galatyuk, T, Geurts, F, Ghimire, N, Gibson, A, Gopal, K, Gou, X, Grosnick, D, Gupta, A, Guryn, W, Hamed, A, Han, Y, Harabasz, S, Harasty, M D, Harris, J W, Harrison, H, He, W, He, X H, He, Y, Heppelmann, S, Herrmann, N, Holub, L, Hu, C, Hu, Q, Hu, Y, Huang, H, Huang, H Z, Huang, S L, Huang, T, Huang, X, Huang, Y, Humanic, T J
Format:	Artikel
Sprache:	eng
Schlagworte:	Jets & heavy flavor physics NUCLEAR PHYSICS AND RADIATION PHYSICS Quark-gluon plasma Relativistic heavy-ion collisions
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Zusammenfassung:	We report on measurements of sequential ϒ suppression in Au+Au collisions at sqrt[s_{NN}]=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 (R_{AA}), 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) R_{AA} 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 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 medium at RHIC whose temperature is sufficiently high to strongly suppress excited ϒ states.
ISSN:	0031-9007 1079-7114
DOI:	10.1103/PhysRevLett.130.112301