QCD corrections to J/psi production via color octet states at Tevatron and LHC
QCD corrections to J/psi production via color octet states at Tevatron and LHC
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DOI：
10.1016/j.physletb.2009.02.026
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发表时间：
2008-05
期刊：
影响因子：
--
通讯作者：
Bin Gong;Xue Li;Jian-xiong Wang
中科院分区：
文献类型：
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作者：
Bin Gong;Xue Li;Jian-xiong Wang
计算了电子对撞机和大型强子对撞机上S波色八重态对J/ψ产生的次前导QCD修正。J/ψ产额和偏振的横向动量pt分布变化不大。通过对在Tevatron上测量的J/ψ产额的pt分布进行拟合，同时考虑了色单重态和色八重态，我们得到了NLO的色八重态矩阵元。由此得到的J/ψ偏振的pt分布仍然与实验数据不符。因此，我们得出的结论是，仅在非相对论QCD框架内包含ψ修正不能解决J/NLO极化理论和实验数据之间的巨大差异，而必须从不同的角度来探索解决方案。
The Next-To-Leading-Order (NLO) QCD corrections to J/ψ production via S-wave color-octet states at the Tevatron and LHC are calculated. There are only slight changes to the transverse momentum ptdistributions of J/ψ production and polarization. By fitting the ptdistribution of J/ψ production measured at Tevatron with both color-singlet and color-octet included, we obtain the color-octet matrix elements at NLO. The resulting ptdistribution of J/ψ polarization still does not coincide with the experimental data. Therefore, we have reached the conclusion that the large discrepancy of J/ψ polarization between theory and experimental data cannot be solved by just including NLO corrections within non-relativistic QCD framework and then one has to explore solution from different angles.