Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2010-07-16
Physics
High Energy Physics
High Energy Physics - Phenomenology
10 pages, 6 figures, using latex with ws-procs9x6.cls, invited presented at the workshop on Exclusive Reactions at High Moment
Scientific paper
In this talk it is reported on an analysis of hard exclusive pion electroproduction within the handbag approach. Particular emphasis is laid on single-spin asymmetries. It is argued that a recent HERMES measurement of asymmetries measured with a transversely polarized target clearly indicate the occurrence of strong contributions from transversely polarized photons. Within the handbag approach such gamma_T --> pion transitions are described by the transversity GPDs accompanied by a twist-3 pion wave function. It is shown that this approach leads to results on cross sections and single-spin asymmetries in fair agreement with experiment.
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