Transversity and Collins functions from SIDIS and e+e- data

Details Transversity and Collins functions from SIDIS and e+e- data Transversity and Collins functions from SIDIS and e+e- data

2007-01-02

arxiv.org/abs/hep-ph/0701006v3

Phys.Rev.D75:054032,2007

Physics

High Energy Physics

High Energy Physics - Phenomenology

Revised version to appear in Phys. Rev. D. Few misprints corrected, new figures

Scientific paper

10.1103/PhysRevD.75.054032

A 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, is performed. It results in the extraction of the Collins fragmentation function and, for the first time, of the transversity distribution function for u and d quarks. These turn out to have opposite signs and to be sizably smaller than their positivity bounds. Predictions for the azimuthal asymmetry A_{UT}^{sin(phi_h + phi_S)}, as will soon be measured at JLab and COMPASS operating on a transversely polarized proton target, are then presented.

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