Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2004-08-31
Phys.Rev. D71 (2005) 014002
Physics
High Energy Physics
High Energy Physics - Phenomenology
LaTeX, 21+1 pages, 1 ps figure
Scientific paper
10.1103/PhysRevD.71.014002
We consider a general formalism to compute inclusive polarised and unpolarised cross sections within pQCD and the factorisation scheme, taking into account parton intrinsic motion in distribution and fragmentation functions, as well as in the elementary dynamics. Surprisingly, the intrinsic partonic motion, with all the correct azimuthal angular dependences, produces a strong suppression of the transverse single spin asymmetry arising from the Collins mechanism. As a consequence, and in contradiction with earlier claims, the Collins mechanism is unable to explain the large asymmetries found in p(transv. polarised) p --> pion + X at moderate to large Feynman x_F. The Sivers effect is not suppressed.
Anselmino Mauro
Boglione Maria
D'Alesio Umberto
Leader Elliot
Murgia Francesco
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