arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 2009.03028hep-ph
收藏

QCD次主导级$Υ(nS)$强子产生极化的完全研究

The complete study on polarization of $Υ(nS)$ hadroproduction at QCD next-to-leading order

Yu Feng, Bin Gong, Chao-Hsi Chang, Jian-Xiong Wang

摘要:

将非相对论量子色动力学因式分解方法应用于$Υ(1S,2S,3S)$强子产生,在QCD次领先阶下,对产生的极化参数$λ_θ$,$λ_{θϕ}$,$λ_ϕ$进行了全面的分析.利用从实验数据中提取的$Υ$强子产生的产生率和极化参数$λ_θ$的长距离矩阵元,我们的结果在螺旋度和Collins-Soper坐标系下对测量参数$λ_{θϕ}$和$λ_ϕ$提供了很好的描述.在我们的计算中,帧不变参数$\tildeλ$在两个帧中是一致的。最后,指出现有的实验数据和相应的理论预测之间存在着差异的$\tildeλ$。

英文摘要:

Applying the nonrelativistic quantum chromodynamics factorization formalism to the $Υ(1S,2S,3S)$ hadroproduction, a complete analysis on the polarization parameters $λ_θ$, $λ_{θϕ}$, $λ_ϕ$ 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 parameter $λ_θ$ of $Υ$ hadroproduction, our results provide a good description for the measured parameters $λ_{θϕ}$ and $λ_ϕ$ in both the helicity and the Collins-Soper frames. In our calculations the frame invariant parameter $\tildeλ$ is consistent in the two frames. Finally, it is pointed out that there are discrepancies for $\tildeλ$ between available experimental data and corresponding theoretical predictions.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

↑