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arXiv 1012.1954hep-ph
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在sqrt{s}=200 GeV时，pp中的提示J/psi的极化-> J/psi+X

Polarization of prompt J/psi in pp -> J/psi+X at sqrt{s}=200 GeV

Hee Sok Chung, Seyong Kim, Jungil Lee, Chaehyun Yu

备注：
4 pages, 4 figures, minor corrections, version published in Phys. Rev. D
发表信息：
Phys.Rev.D83:037501,2011
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摘要：

在非相对论QCD因式分解方法的框架下，计算了动量中心能量sqrt{s}=200 GeV的质子-质子碰撞产生的瞬发J/psi的截面和极化.给出了前向快度区1.2 < |y| < 2.2的横动量分布和横动量区2 GeV < p_T < 20 GeV的快度分布。在强耦合常数下，计算了首阶微扰贡献。我们预测轻微的横向极化的J/psi的前向快度区域，而在中快度区域是轻微的纵向。横动量分布与PHENIX的初步数据和次领先阶的色单重态模型预测的α_s值符合得很好，但与领先阶色单重态模型和s通道切割方法的结果不一致。

英文摘要：

Within the framework of the nonrelativistic QCD factorization approach, we compute the cross section and polarization of prompt J/psi produced from proton-proton collisions at the center-of-momentum energy sqrt{s}=200 GeV. We present the transverse-momentum distribution in the forward-rapidity region 1.2 < |y| < 2.2 and the rapidity distribution over the transverse-momentum range 2 GeV < p_T < 20 GeV. The perturbative contributions are computed at leading order in the strong coupling constant. We predict slight transverse polarization of J/psi in the forward-rapidity region, while that for the mid-rapidity region is slightly longitudinal. The transverse-momentum distribution agrees well with the PHENIX preliminary data and the color-singlet-model prediction at next-to-leading order in alpha_s, but disagrees with the result from the leading-order color-singlet model or the s-channel-cut method.

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