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Transversity and Collins Fragmentation Functions: Towards a New Global Analysis

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arxiv 0807.0173 v1 pith:CRNKAICQ submitted 2008-07-01 hep-ph

M. Anselmino , M. Boglione , U. D'Alesio , A. Kotzinian , S. Melis , F. Murgia , A. Prokudin , C. Turk This is my paper
classification hep-ph
keywords analysiscollinscompassdatafragmentationfunctionglobaltransversity
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abstract

A new, preliminary 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, 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 A_UT^{\sin(\phi_h + \phi_S)} at JLab and COMPASS, operating on a transversely polarized proton target, are presented.

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