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The much debated issue of the transverse single spin asymmetry A_N observedin the inclusive large P_T production of a single hadron in pp interactions,p(transv. polarized) p --> pion X, is considered in a TMD factorization scheme.A previous result [1,2] stating that the maximum contribution of the Collinseffect is strongly suppressed, is revisited, correcting a numerical error. Newestimates are given, adopting the Collins functions recently extracted fromSIDIS and e+e- data, and phenomenological consequences are discussed.

On the role of Collins effect in the single spin asymmetry A_N in p(transv. polarized) p --> h X processes