Spin effects in the fragmentation of transversely polarized and unpolarized quarks
Abstract
We study the fragmentation of a transversely polarized quark into a non collinear (k_T not= 0) spinless hadron and the fragmentation of an unpolarized quark into a non collinear transversely polarized spin 1/2 baryon. These nonperturbative properties are described by spin and k_T dependent fragmentation functions and are revealed in the observation of single spin asymmetries. Recent data on the production of pions in polarized semi-inclusive DIS and long known data on Lambda polarization in unpolarized p-N processes are considered: these new fragmentation functions can describe the experimental results and the single spin effects in the quark fragmentation turn out to be surprisingly large.
Keywords
Cite
@article{arxiv.hep-ph/0011361,
title = {Spin effects in the fragmentation of transversely polarized and unpolarized quarks},
author = {M. Anselmino and D. Boer and U. D'Alesio and F. Murgia},
journal= {arXiv preprint arXiv:hep-ph/0011361},
year = {2009}
}
Comments
5 pages + 2 eps figures, uses aipproc.sty and epsfig.sty. Talk delivered by M. Anselmino at the "14th International Spin Physics Symposium", SPIN2000, October 16-21, 2000, Osaka, Japan