The exclusive Drell-Yan process and deeply virtual pion production

TL;DR

This paper analyzes exclusive pion production and Drell-Yan processes using the handbag approach, highlighting the role of transversely polarized photons and transversity GPDs, and compares theoretical predictions with experimental data.

Contribution

It introduces an extended handbag approach incorporating transversity GPDs and pion pole contributions to describe exclusive pion production and Drell-Yan processes.

Findings

Good agreement with experimental cross sections and spin asymmetries

Strong contributions from transversely polarized photons observed

Estimated partial cross sections for exclusive Drell-Yan process

Abstract

In this talk it is reported on analyses of l p -> l pi+ n and pi- p -> l+ l- n within the handbag approach. It is argued that recent measurements of hard pion production performed by HERMES and CLAS clearly indicate the occurrence of strong contributions from transversely polarized photons. The gamma*T -> pi transitions are described by the transversity GPDs accompanied by twist-3 pion wave functions. The experiments also require strong contributions from the pion pole which can be modeled as a classical one-pion exchange. With these extensions the handbag approach leads to results on cross sections and spin asymmetries in fair agreement with experiment. This approach is also used for an estimate of the partial cross sections for the exclusive Drell-Yan process.