Comparing extractions of Sivers functions
  A comparison is given of the various recently published extractions of the Sivers functions from the HERMES and COMPASS data on single-transverse spin asymmetries in semi-inclusive deeply inelastic scattering. 
M.Anselmino, M.Boglione, J.C.Collins, U.D'Alesio, A.V.Efremov,   K.Goeke, A.Kotzinian, S.Menzel, A.Metz, F.Murgia, A.Prokudi...