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arXiv · 0907.4538

Upsilon production in d+Au collisions at STAR

Haidong Liu
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Abstract

We present the analysis of $Υ\to e^{+}e^{-}$ production in d+Au collisions at $\sqrt{s_{NN}} = 200$ GeV from the STAR experiment. Using higher level dedicated $Υ$ triggers, STAR has sampled 32 nb$^{-1}$ of integrated luminosity in year 2008 d+Au run. The cross section is found as $BR\times{({{dσ}\over{dy}})}_{y=0}^{Υ(1S+2S+3S)}=35\pm4(stat.)\pm5(sys.)$ nb and it is consistent with NLO CEM prediction with anti-shadowing effects. In addition we calculated the nuclear modification factor $R_{dAu}=0.98\pm0.32(stat.)\pm0.28(sys.)$, which suggests the $Υ(1S+2S+3S)$ production follows $N_{bin}$ scaling.

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Haidong Liu. 2009-09-20. Upsilon production in d+Au collisions at STAR. https://doi.org/10.1016/j.nuclphysa.2009.10.019

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