Measurement of Υ(1S+2S+3S) production in p+p and Au + Au collisions at √sNN=200 GeV

Adare, A. and Afanasiev, S. and Aidala, C. and Ajitanand, N. N. and Akiba, Y. and Csanád, Máté and Csörgő, Tamás and Dávid, Gábor and Imrek, József and Kiss, Ádám and Nagy, Márton and Ster, András and Sziklai, János István and Tarján, Péter and Vértesi, Róbert (2015) Measurement of Υ(1S+2S+3S) production in p+p and Au + Au collisions at √sNN=200 GeV. PHYSICAL REVIEW C, 91 (2). ISSN 2469-9985

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Abstract

Measurements of bottomonium production in heavy ion and p+p collisions at the Relativistic Heavy Ion Collider (RHIC) are presented. The inclusive yield of the three Υ states, Υ(1S + 2S + 3S), was measured in the PHENIX experiment via electron-positron decay pairs at midrapidity for Au+Au and p+p collisions at √sNN = 200 GeV. The Υ(1S + 2S + 3S) → e +e − differential cross section at midrapidity was found to be Beedσ/dy = 108 ± 38 (stat) ± 15 (syst) ± 11 (luminosity) pb in p+p collisions. The nuclear modification factor in the 30% most central Au+Au collisions indicates a suppression of the total Υ state yield relative to the extrapolation from p+p collision data. The suppression is consistent with measurements made by STAR at RHIC and at higher energies by the CMS experiment at the Large Hadron Collider.

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