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

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