TL;DR
This paper analyzes exclusive pion electroproduction using the handbag approach, emphasizing single-spin asymmetries and the role of transversity GPDs, aligning theoretical predictions with recent experimental data.
Contribution
It demonstrates that transversity GPDs and twist-3 pion wave functions explain observed asymmetries and cross sections in pion electroproduction.
Findings
Transversely polarized photons significantly contribute to asymmetries.
Handbag approach results agree with experimental measurements.
Transversity GPDs are crucial for understanding exclusive pion production.
Abstract
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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