Bottomonium production in heavy-ion collisions at STAR

0461517 - ÚJF 2017 RIV NL eng C - Konferenční příspěvek (zahraniční konf.)
Vértési, Robert
Bottomonium production in heavy-ion collisions at STAR.
Nuclear and Particle Physics Proceedings. Vol. 276. Amsterdam: Elsevier Science BV, 2016, s. 269-272. ISSN 2405-6014.
[7th International Conference on Hard and Electromagnetic Probes of High Energy Nuclear Collisions. Montreal (CA), 29.06.2015-03.07.2015]
Institucionální podpora: RVO:61389005
Klíčová slova: Brookhaven RHIC Coll * quarkonium: heavy * quarkonium: production * quark gluon: plasma
Kód oboru RIV: BG - Jaderná, atomová a mol. fyzika, urychlovače

Bottomonium measurements provide unique insight into hot and cold nuclear matter effects present in the medium that is formed in high-energy heavy-ion collisions. Recent STAR results show that in root S-NN = 200 GeV central Au+Au collisions the Upsilon(1S) state is suppressed more than the case that if only cold nuclear matter effects were present, and the excited state yields are consistent with a complete suppression. In 2012, STAR also collected 263.4 mu b(-1) high-energy-electron triggered data in U+U collisions at root S-NN = 193 GeV. Central U+U collisions, with an estimated 20% higher energy density than that in central Au+Au data, extend the Upsilon(1S+2S+3S) and Upsilon(1S) nuclear modification trends observed in Au+Au towards higher number of participant nucleons, and confirm the suppression of the Upsilon(1S) state. We see a hint with 1.8 sigma significance that the Upsilon(2S+3S) excited states are not completely suppressed in U+U collisions. These data support the sequential in-medium quarkonium dissociation picture and favor models with a strong q (q) over bar binding.
Trvalý link: http://hdl.handle.net/11104/0261140