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Using partonic states we verify the transverse momentum dependentfactorization for single transverse spin asymmetries in semi inclusive DIS atleading but nontrivial order of alpha_s. The factorization has been previouslyderived in a formal way by using diagram expansion at hadron level. We findwith our partonic results that two relevant structure functions satisfy thefactorization. Our results also satisfy the collinear factorization but withthe perturbative coefficient different than that derived formally.

Partonic State and Single Transverse Spin Asymmetries in Semi Inclusive DIS