Azimuthal asymmetries and Collins analyzing power
A. V. Efremov, K. Goeke, P. Schweitzer
Abstract
Spin azimuthal asymmetries in pion electro-production in deep inelastic scattering off longitudinally polarized protons, measured by HERMES, are well reproduced theoretically with no adjustable parameters. Predictions for azimuthal asymmetries for a longitudinally polarized deuteron target are given. The z-dependence of the Collins fragmentation function is extracted. The first information on e(x) is extracted from CLAS ALU asymmetry.
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