Polarization for prompt J/ψ and ψ(2s) production at the Tevatron and LHC.
Polarization for prompt J/ψ and ψ(2s) production at the Tevatron and LHC.
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DOI：
10.1103/physrevlett.110.042002
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发表时间：
2012-05
影响因子：
8.6
通讯作者：
Bin Gong;Lu-Ping Wan;Jian-xiong Wang;Hong-Fei Zhang
中科院分区：
文献类型：
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作者：
Bin Gong;Lu-Ping Wan;Jian-xiong Wang;Hong-Fei Zhang
利用非相对论QCD因子化方法，我们首次对瞬发J/π强子产生的极化进行了次领先阶的研究，其中包括χ（c）（（3）P（J）（1），（3）S（1）（8））和π（2s）的反馈，这两个分量是非常重要的.利用Tevatron和LHC测量的J/ψ，ψ（2s）和χ（c）的组合拟合得到的色八重态长距离矩阵元，给出了瞬发J/ψ偏振的预测，结果与CDF运行I的数据一致（除两点外），但与CDF运行II的数据不一致，而与ALICE的数据（包括J/ψ）接近。LHC的测量有望澄清这一情况。
With nonrelativistic QCD factorization, we present the first complete next-to-leading order study on the polarization of prompt J/ψ hadroproduction by including feeddown from χ(c)((3)P(J)(1),(3)S(1)(8)) and ψ(2s) which turn out to be very important parts. By using the color-octet long-distance matrix elements obtained from a combined fit of the measurements at the Tevatron and LHC for J/ψ, ψ(2s) and χ(c), the prompt J/ψ polarization predictions are presented, and the results are in agreement with the CDF run I data (except two points), but in conflict with the CDF run II data, while they are close to the ALICE data (inclusive J/ψ). The measurements at the LHC are expected to clarify the situation.