Complete study on polarization of Upsilon(nS) hadroproduction at QCD next-to-leading order
Complete study on polarization of Upsilon(nS) hadroproduction at QCD next-to-leading order
复制标题
完成 QCD 次领先级 Upsilon(nS) 氢生产极化的研究
DOI：
10.1088/1674-1137/abc682
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发表时间：
2021
影响因子：
3.6
通讯作者：
Wang Jian-Xiong
中科院分区：
文献类型：
--
作者：
Feng Yu;Gong Bin;Chang Chao-Hsi;Wang Jian-Xiong
将非相对论量子色动力学分解形式应用于氢能产生，对产生的偏振参数进行了完整的分析，以 QCD 次领先顺序呈现。通过从生产速率和极化参数的实验数据中提取长距离矩阵元素，我们的结果为螺旋度和柯林斯-索珀框架中的测量参数提供了良好的描述。在我们的计算中，帧不变参数在两个帧中是一致的。最后指出现有的实验数据与相应的理论预测之间存在差异。
Applying the nonrelativistic quantum chromodynamics factorization formalism to thehadroproduction, a complete analysis on the polarization parameters,,for the production are presented at QCD next-to-leading order. With the long-distance matrix elements extracted from experimental data for the production rate and polarization parameterofhadroproduction, our results provide a good description for the measured parametersandin both the helicity and the Collins-Soper frames. In our calculations the frame invariant parameteris consistent in the two frames. Finally, it is pointed out that there are discrepancies forbetween available experimental data and corresponding theoretical predictions.