Abstract
A consistent phenomenological approach to the computation of transverse single spin asymmetries in inclusive hadron production is presented, based on the assumed generalization of the QCD factorization theorem to the case in which quark intrinsic motion is taken into account. New k ⊥ and spin dependent quark distribution and fragmentation functions are considered: some of them are fixed by fitting data on p ↑ p → πX and predictions are given for single spin asymmetries in ℓp ↑ → πX and γ ∗p ↑ → πX processes.
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