First results from a new global analysis of the experimental data on azimuthal asymmetries in SIDIS, from HERMES and COMPASS collaborations, and in e(+)e(-) -> h(1)h(2)X processes, from the Belle collaboration, are presented. 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 A(UT) (sin(phi(h)+phi(S))) at JLab and COMPASS, operating on a transversely polarized proton target, are given.
New preliminary results on the Transversity distribution and the Collins Fragmentation Functions
D'ALESIO, UMBERTO;MELIS, STEFANO;
2009-01-01
Abstract
First results from a new global analysis of the experimental data on azimuthal asymmetries in SIDIS, from HERMES and COMPASS collaborations, and in e(+)e(-) -> h(1)h(2)X processes, from the Belle collaboration, are presented. 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 A(UT) (sin(phi(h)+phi(S))) at JLab and COMPASS, operating on a transversely polarized proton target, are given.
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