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arxiv: hep-ph/0701006 · v3 · submitted 2007-01-02 · ✦ hep-ph

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

M. Anselmino (1) , M. Boglione (1) , U. D'Alesio (2) , A. Kotzinian (3) , F. Murgia (2) , A. Prokudin (1) , C. Turk (1) ((1) University , INFN
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Torino Italy (2) University INFN Cagliari (3) Yerevan Physics Institute Armenia JINR Dubna Russia)
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classification ✦ hep-ph
keywords azimuthalcollinscompassdatafunctionsidistransversityanalysis
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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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