Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2003-03-07
Phys.Lett. B568 (2003) 63-72
Physics
High Energy Physics
High Energy Physics - Phenomenology
8 pages, 4 figures. References added, small changes in text, Appendix added
Scientific paper
10.1016/j.physletb.2003.06.016
Recently it has been argued that the transverse momentum dependent twist-2 Sivers distribution function does not vanish in QCD. Therefore both, the Collins and Sivers effects, should be considered in order to explain the azimuthal single spin asymmetries A(UL) in pion production in semi-inclusive deeply inelastic lepton scattering of a longitudinally polarized target. On the basis of presently available phenomenological information on the Sivers function we estimate that for those asymmetries A(UL) in the kinematic region of the HERMES experiments the Sivers effect can be neglected with respect to the Collins effect. It is argued that the same feature holds also for the COMPASS and CLAS experiments. This justifies theoretical approaches to understand the HERMES data on the basis of the Collins effect only.
Efremov A. V.
Goeke Klaus
Schweitzer Pascal
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