Abstract
In the two papers published recently,1, 2 we apply collinear expansion to both inclusive ([Formula: see text]) and semi-inclusive ([Formula: see text]) hadron production in [Formula: see text] 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.
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