Physics – Nuclear Physics – Nuclear Experiment
Scientific paper
2009-07-27
Nucl.Phys.A830:235c-238c,2009
Physics
Nuclear Physics
Nuclear Experiment
4 pages, 2 figures - To appear in the conference proceedings for Quark Matter 2009, March 30 - April 4, Knoxville, Tennessee (
Scientific paper
10.1016/j.nuclphysa.2009.10.019
We present the analysis of $\Upsilon\to e^{+}e^{-}$ production in d+Au collisions at $\sqrt{s_{NN}} = 200$ GeV from the STAR experiment. Using higher level dedicated $\Upsilon$ triggers, STAR has sampled 32 nb$^{-1}$ of integrated luminosity in year 2008 d+Au run. The cross section is found as $BR\times{({{d\sigma}\over{dy}})}_{y=0}^{\Upsilon(1S+2S+3S)}=35\pm4(stat.)\pm5(sys.)$ 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 $\Upsilon(1S+2S+3S)$ production follows $N_{bin}$ scaling.
for the STAR Collaboration
Liu Haidong
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