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arXiv 1309.4191hep-ph
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e^+e^-湮灭中包含强子产生中高扭曲对碎裂函数的贡献

Higher twist contribution to fragmentation function in inclusive hadron production in e^+e^- annihilation

Shu-yi Wei, Yu-kun Song, Zuo-tang Liang

摘要:

我们适用于共线膨胀包容强子生产$e^+e^-$湮灭,并推导出一个形式主义适合系统的研究领导以及更高的扭曲贡献的碎裂功能在树的水平。对自旋为0、1/2和1的强子进行了计算,得到了不同情况下强子张量碎裂函数的不同分量、微分截面和强子极化的结果。结果显示了一些有趣的特征,如在扭转3能级上自旋1/2强子存在横向极化,矢量介子自旋排列与夸克极化无关.

英文摘要:

We apply collinear expansion to inclusive hadron production in $e^+e^-$ annihilation and derive a formalism suitable for systematic study of leading as well as higher twist contributions to fragmentation functions at the tree level. We make the calculations for hadrons with spin-0, spin-1/2 as well as spin-1 and obtain the results in terms of different components of fragmentation functions for the hadronic tensors, the differential cross section as well as hadron polarizations in different cases. The results show a number of interesting features such as the existence of transverse polarization for spin-1/2 hadrons at the twist-3 level, the quark polarization independence of the spin alignment of vector mesons.

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。

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