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The COMPASS Collaboration at CERN has measured the transverse spin azimuthalasymmetry of charged hadrons produced in semi-inclusive deep inelasticscattering using a 160 GeV positive muon beam and a transversely polarised NH_3target. The Collins asymmetry of the proton was extracted in the Bjorken xrange 0.003<x<0.7. These new measurements confirm with higher accuracy previousmeasurements from the COMPASS and HERMES collaborations, which exhibit adefinite effect in the valence quark region. The asymmetries for negative andpositive hadrons are similar in magnitude and opposite in sign. They arecompatible with model calculations in which the u-quark transversity isopposite in sign and somewhat larger than the d-quark transversity distributionfunction. The asymmetry is extracted as a function of Bjorken $x$, the relativehadron energy $z$ and the hadron transverse momentum p_T^h. The high statisticsand quality of the data also allow for more detailed investigations of thedependence on the kinematic variables. These studies confirm the leading-twistnature of the Collins asymmetry.

Experimental investigation of transverse spin asymmetries in muon-p SIDIS processes: Collins asymmetries