A. Prokudin

Sivers effect for pion and kaon production in semi-inclusive deep inelastic scattering

We study the Sivers effect in the transverse single spin asymmetries (SSA) for pion and kaon production in semi-inclusive deep inelastic scattering (SIDIS) processes. We perform a fit of

Transversity and Collins functions from SIDIS and e+ e- data

ensuremath A^{sin(phi_h-phi_S)}_{UT}

Update on transversity and Collins functions from SIDIS and e+e− data

which, by including recent high-statistics experimental data for pion and kaon production from HERMES and COMPASS Collaborations, allows a new determination of the Sivers distribution functions for quarks and antiquarks with u , d and s flavours. Estimates for forthcoming SIDIS experiments at COMPASS and JLab are given.

Role of Cahn and Sivers effects in deep inelastic scattering

A global analysis of the experimental data on azimuthal asymmetries in semi-inclusive deep inelastic scattering (SIDIS), from the HERMES and COMPASS Collaborations, and in

Extracting the Sivers function from polarized SIDIS data and making predictions

{e}^{+}{e}^{ensuremath{-}}ensuremath{rightarrow}{h}_{1}{h}_{2}X

Extracting the sivers function from polarized semi-inclusive deep inelastic scattering data and making predictions

processes, from the Belle Collaboration, is performed. It results in the extraction of the Collins fragmentation function and, for the first time, of the transversity distribution function for

Semi-Inclusive Deep Inelastic Scattering processes from small to large PT

u

Sivers effect in Drell-Yan processes

and

Transversity and Collins Fragmentation Functions: Towards a New Global Analysis

d

Single spin asymmetries in l p ---> h X processes: A Test of factorization

quarks. These turn out to have opposite signs and to be sizably smaller than their positivity bounds. Predictions for the azimuthal asymmetry