Transversity and Collins Fragmentation Functions: Towards a New Global Analysis
Abstract
A new, preliminary global analysis of the experimental data on azimuthal asymmetries in SIDIS from HERMES and COMPASS collaborations, and in e+e- --> h1 h2 X processes from the BELLE collaboration, is performed. The new data allow for a more precise determination of the Collins fragmentation function and of the transversity distribution function for u and d quarks, in comparison with the results of our previous analysis. Estimates for the single spin asymmetry AUT(φh + φS) at JLab and COMPASS, operating on a transversely polarized proton target, are presented.
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