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arXiv 1005.4100nucl-ex
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STAR的颠覆性制作

Upsilon Productions at STAR

A. M. Hamed

备注：
4 pages, 6 figures, Lake Louise Winter Institute 2010, 15th-20th February 2010 Alberta, Canada
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摘要：

用RHIC的STAR探测器测量了质心能量为$\sqrt{s}$ = 200 GeV的$p+p$碰撞和$+Au$碰撞中中快度（$y$）下的$Υ(1S+2S+3S)\to e^{+}e^{-}$截面。在$p+p$中，测得的横截面与世界数据趋势一致，是$\sqrt{s}$的函数，与色蒸发模型（CEM）一致，而在次领先阶量子色动力学（NLO QCD）计算中，色单重态模型（CSM）低估了横截面。在d+ $Au$中，测量的截面与具有反遮蔽效应的CEM预测一致，并且核修改因子表明$Υ(1S+2S+3S)$产生在当前不确定性内遵循二进制标度。这些测量为今后测量$Au+Au$碰撞中$Υ$的产生提供了基准。

英文摘要：

The $Υ(1S+2S+3S)\to e^{+}e^{-}$ cross section is measured at mid-rapidity ($y$) in $p+p$ collisions and in d$+Au$ collisions at center-of-mass energy $\sqrt{s}$ = 200 GeV with the STAR detector at RHIC. In $p+p$, the measured cross section is found to be consistent with the world data trend as a function of $\sqrt{s}$, in agreement with the Color Evaportaion Model (CEM), and underestimated by the Color Singlet Model (CSM) up to the Next-to-Leading-Order Quantum Chromodynamics (NLO QCD) calculations. In d+$Au$, the measured cross section is in agreement with the CEM prediction with anti-shadowing effects, and the nuclear modification factor indicates that $Υ(1S+2S+3S)$ production follows binary scaling within the current uncertainties. These measurements provide a benchmark for the future measurements of $Υ$ production in $Au+Au$ collisions.

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