The much debated issue of the transverse single spin asymmetry AN observed in the inclusive large PT production of a single hadron in pp interactions, p(uparrow) p -> pion X, is considered in a transverse momentum dependent factorization scheme. A previous result [M. Anselmino et al., Phys. Rev. D 71, 014002 (2005), M. Anselmino et al., Phys. Rev. D 73, 014020 (2006)] 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 semi-inclusive deep inelastic scattering and e+e- data, and phenomenological consequences are discussed.
Role of Collins effect in the single spin asymmetry AN in p(up arrow) p --> h X processes
D'ALESIO, UMBERTO;MELIS, STEFANO;
2012-01-01
Abstract
The much debated issue of the transverse single spin asymmetry AN observed in the inclusive large PT production of a single hadron in pp interactions, p(uparrow) p -> pion X, is considered in a transverse momentum dependent factorization scheme. A previous result [M. Anselmino et al., Phys. Rev. D 71, 014002 (2005), M. Anselmino et al., Phys. Rev. D 73, 014020 (2006)] 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 semi-inclusive deep inelastic scattering and e+e- data, and phenomenological consequences are discussed.
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