Higher twist effects in $e^{+}{e}^{-}$ annihilation at high energies

Abstract

In the two papers published recently, we apply collinear expansion to both inclusive ($e^{+}{e}^{-}\to h+X$) and semi-inclusive ($e^{+}{e}^{-}\to h+\bar{q}+X$) 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.

Comments: 6 pages, contribution to the proceedings of the 21st International Symposium on Spin Physics (Spin2014), Beijing, China, October 20-24, 2014