We present a calculation of inclusive polarised and unpolarised cross sections within pQCD and the factorisation scheme, taking into account the parton intrinsic motion, k(perp), in distribution and fragmentation functions, as well as in the elementary dynamics. We show, in contradiction with earlier claims, that the Collins mechanism is suppressed and unable to explain the large asymmetries found in p(uparrow) p -> pi X at moderate to large Feynman x(F). The Sivers effect is not suppressed.
Can the Collins mechanism explain the large transverse single spin asymmetries observed in p(uparrow) p -> pi X?
D'ALESIO, UMBERTO;
2005-01-01
Abstract
We present a calculation of inclusive polarised and unpolarised cross sections within pQCD and the factorisation scheme, taking into account the parton intrinsic motion, k(perp), in distribution and fragmentation functions, as well as in the elementary dynamics. We show, in contradiction with earlier claims, that the Collins mechanism is suppressed and unable to explain the large asymmetries found in p(uparrow) p -> pi X at moderate to large Feynman x(F). The Sivers effect is not suppressed.
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