Update on transversity and Collins functions from SIDIS and e+ e- data
  We present an update of a previous 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. Compared to the first extraction, a more precise determination of the Collins fragmentation function and the transversity distribution function for u and d quarks is obtained. 
M. Anselmino (1), M. Boglione (1), U. D'Alesio (2,3), A. Kotzinian   (4), F. Murgia (3), A. Prokudin (1), S. Melis (1) ((1) ...