We present an update of a previous global analysis of the experimental data on azimuthal asymmetries in semi-inclusive deep inelastic scattering (SIDIS), from the HERMES and COMPASS Collaborations, and in e+ e- -> h1 h2 X processes, from the Belle Collaboration. Compared to the first extraction, a more precise determination of the Collins fragmentation function and the transversity distribution function for u and d quarks is obtained.
@article{arxiv.0812.4366,
title = {Update on transversity and Collins functions from SIDIS and e+ e- data},
author = {M. Anselmino and M. Boglione and U. D'Alesio and A. Kotzinian and F. Murgia and A. Prokudin and S. Melis},
journal= {arXiv preprint arXiv:0812.4366},
year = {2011}
}
Comments
10 pages, 10 ps figures, uses espcrc2.sty. Invited talk delivered by U. D'Alesio at the Ringberg Workshop "New Trends in HERA Physics 2008", Ringberg Castle, Tegernsee, Germany, October 5-10, 2008. Submitted to Nucl. Phys. Proc. Suppl