arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 2007.14425hep-phhep-exnucl-exnucl-th
收藏

单强子横动量随推力轴分布的QCD修正

QCD resummation on single hadron transverse momentum distribution with the thrust axis

Zhong-Bo Kang, Ding Yu Shao, Fanyi Zhao

摘要:

本文导出了正负电子碰撞中具有推力轴的单强子产生的非极化横动量分布($j_T$)的横动量相关(TMD)分解和再表示公式。两个不同的运动学区域,包括小的横向动量限制$j_T \ll Q$,和联合横向动量和阈值限制$j_T \ll Q(1-z_h) \ll Q$,其中$Q$和$z_h$是硬散射能量和观测到的强子动量分数。利用有效的理论方法,将$\ln(Q/j_T)$和$\ln(1-z_h)$归为各阶.最后给出了计算的带电π介子产生的微分截面和高斯宽度,发现我们的结果与Belle合作组的测量结果一致.

英文摘要:

We derive the transverse momentum dependent (TMD) factorization and resummation formula of the unpolarized transverse momentum distribution ($j_T$) for the single hadron production with the thrust axis in electron-positron collision. Two different kinematic regions are considered, including small transverse momentum limit $j_T \ll Q$, and joint transverse momentum and threshold limit $j_T \ll Q(1-z_h) \ll Q$, where $Q$ and $z_h$ are the hard scattering energy and the observed hadron momentum fraction. Using effective theory methods, we resum logarithms $\ln(Q/j_T)$ and $\ln(1-z_h)$ to all orders. In the end we present the differential cross sections and Gaussian widths calculated for the inclusive charged pion production and find that our results are consistent with the measurements reported by the Belle collaboration.

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。

↑