/ Phenomenology-HEP hep-ph/0703293

Colour modification of effective T-odd distributions

Ratcliffe, Philip G. (INFN, Milan Bicocca) ; Teryaev, Oleg V. (Dubna, JINR)

Pages: 4

Abstract: We show that soft-gluon twist-3 contributions to single-spin asymmetries (SSA) in hard processes may be presented in the form of effective T-odd Sivers distributions, whose signs and scales are modified by process-dependent colour factors. We thus prove that the Sivers mechanism may be applied at large transverse momenta. We stress that twist-3 SSA in semi-inclusive deeply inelastic scattering and Drell-Yan processes are not suppressed by a virtual-photon momentum transfer and thus correspond to twist two at the hadronic level. More rigorously, the transverse-momentum weighted averages of the Sivers function correspond to increasing twists (3, 5, 7, ...) while the full kT-dependent Sivers function (just as other transverse-momentum dependent distribution and fragmentation functions) corresponds to a resummed infinite tower of higher twists.

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 Запись создана 2010-10-29, последняя модификация 2014-01-30

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