Polarized parton distributions

We analyze spin-dependent parton distributions consistent with the most recent measurements of the spin-dependent deep inelastic scattering structure functions and obtained in the framework of the spin dilution model. Predictions for the doubly polarized proton-proton Drell-Yan asymmetry, for the high pT photon production mechanism and J/ψ excitation, are calculated using these distributions and are shown to be particularly adequate to unveil the polarization of partons in the proton