On the role of Collins effect in the single spin asymmetry A_N in p(transv. polarized) p --> h X processes
- M. AnselminoUniversity of Torino, Italy
- M. Boglione(University of Torino, Italy)
- U. D'Alesio(University of Cagliari, Italy)
- E. Leader(Imperial College, London, UK)
- S. Melis(ECT, Trento, Italy)
- F. Murgia(INFN, Cagliari, Italy)
- A. Prokudin(JLab, Newport News, USA)
Publication date
October 2015
DOIAbstract
The much debated issue of the transverse single spin asymmetry A_N observed in 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 Collins effect is strongly suppressed, is revisited, correcting a numerical error. New estimates are given, adopting the Collins functions recently extracted from SIDIS and e+e- data, and phenomenological consequences are discussed
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