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arXiv 0907.4538nucl-exhep-ex
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STAR d+Au碰撞中的剧变产生

Upsilon production in d+Au collisions at STAR

Haidong Liu

摘要:

本文分析了STAR实验中在$\sqrt{s_{NN}} = 200$ GeV的d+Au碰撞中产生的$Υ\to e^{+}e^{-}$.使用更高级别的专用$Υ$触发器,STAR在2008年d+Au运行中采样了32 nb $^{-1}$的积分亮度。发现横截面为$BR\times{({{dσ}\over{dy}})}_{y=0}^{Υ(1S+2S+3S)}=35\pm4(stat.)\pm5(sys.)$ nb,并且它与具有反遮蔽效应的NLO CEM预测一致。此外,我们计算了核修饰因子$R_{dAu}=0.98\pm0.32(stat.)\pm0.28(sys.)$,这表明$Υ(1S+2S+3S)$的产生遵循$N_{bin}$缩放。

英文摘要:

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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