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

Abstract

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.

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

References in corpus (3)

• A new measurement of the Collins and Sivers asymmetries on a transversely polarised deuteron target
• Collins effect in semi-inclusive deeply inelastic scattering and in electron positron annihilation
• Transversity distribution function in hard scattering of polarized protons and antiprotons in the PAX experiment

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