Making use of the collinear expansion technique developed by Ellis, Furmanski and Petrozio, and the special propagator concept invented by Qiu, we present a factorization approach to the photon fragmentation tensor for the inclusive Lambda hyperon production. As a result, the structure function F~, which is related to the transverse polarization of the inclusive Lambda hyperon in unpolarized electron-positron annihilation, is expressed as a combination of four parton fragmentation matrix elements. Since the inclusive Λ production we considered is theoretically the simplest, our study can be taken as a question to the operatability and practability of the first nonleading QCD factorization theorem in the transverse Λ polarization phenomena.
@article{arxiv.hep-ph/9601256,
title = {Manifestation of $s\to \Lambda$ fragmentation matrix elements via transverse $\Lambda$ polarization in unpolarized $e^-e^+$ annihilation},
author = {Wei Lu and Xue-Qian Li and Hai-Ming Hu},
journal= {arXiv preprint arXiv:hep-ph/9601256},
year = {2019}
}