Upsilon production in d+Au collisions at STAR

Abstract

We present the analysis of ${\rm Y}\to e^{+}{e}^{-}$ production in d+Au collisions at $\sqrt{s_{NN}}=200$ GeV from the STAR experiment. Using higher level dedicated ${\rm Y}$ triggers, STAR has sampled 32 nb${}^{-1}$ of integrated luminosity in year 2008 d+Au run. The cross section is found as $BR\times {(\frac{d\sigma }{dy})}_{y=0}^{{\rm Y}(1S+2S+3S)}=35\pm 4(stat.)\pm 5(sys.)$ nb and it is consistent with NLO CEM prediction with anti-shadowing effects. In addition we calculated the nuclear modification factor $R_{dAu}=0.98\pm 0.32(stat.)\pm 0.28(sys.)$, which suggests the ${\rm Y}(1S+2S+3S)$ production follows $N_{bin}$ scaling.

4 pages, 2 figures - To appear in the conference proceedings for Quark Matter 2009, March 30 - April 4, Knoxville, Tennessee (Updated v1)

References in corpus (3)

• Statistical hadronization of heavy quarks in ultra-relativistic nucleus-nucleus collisions
• Heavy flavor in heavy-ion collisions at RHIC and RHIC II
• Upsilon cross section in p+p collisions at STAR

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• Prospects for quarkonia production studies in U+U collisions
• Fast Heating Dissociation of Upsilon(1S) in Heavy Ion Collisions at RHIC
• RHIC physics overview
• Quarkonium as a tool: cold nuclear matter effects