标题：Higher Twist Effects in e(+)e(-) Annihilation at High Energies
作者机构：[Wei, Shu-yi] Shandong Univ, Sch Phys, Jinan 250100, Shandong, Peoples R China.
会议名称：21st International Symposium on Spin Physics (SPIN)
会议日期：OCT 20-24, 2014
来源：PROCEEDINGS OF THE 21ST INTERNATIONAL SYMPOSIUM ON SPIN PHYSICS (SPIN2014)
关键词：Collinear expansion; fragmentation function; higher twist; azimuthal; asymmetry; spin asymmetry
摘要：In the two papers published recently, (1, 2) we apply collinear expansion to both inclusive (e(+)e(-) -> h + X) and semi-inclusive (e(+)e(-) -> h + (q) over bar + X) hadron production in e(+)e(-) annihilation to derive a formalism suitable for a systematic study of leading as well as higher twist contributions to fragmentation functions at the tree level. We carry out the calculations for hadrons with spin-0, spin-1/2 as well as spin-1. This proceeding is mainly a summary of these two papers.