Transversity via Exclusive pi0 Electroproduction

TL;DR

This paper explores how exclusive pi0 electroproduction can be used to access transversity and related quantities like the tensor charge through the analysis of C-parity odd and chiral odd quantum number combinations, providing insights into the quark helicity flip.

Contribution

It establishes a connection between pi0 electroproduction and transversity via C-odd Regge exchanges and chiral odd GPDs, offering a new method to probe transversity in nucleons.

Findings

Cross sections and asymmetries are sensitive to transversity.

The process isolates C-parity odd and chiral odd contributions.

Helicity structure relates to quark helicity flip.

Abstract

Exclusive pi0 electroproduction from nucleons can be related to transversity, the tensor charge, and other quantities related to transversity. This process isolates C-parity odd and chiral odd combinations of t-channel exchange quantum numbers. In a hadronic picture the meson production amplitudes for intermediate energy and Q are determined by C-odd Regge exchanges with final state interactions. The helicity structure for this C-odd process relates to the quark helicity flip, or chiral odd generalized parton distributions (GPDs).Various cross sections and asymmetries will be sensitive to the transversity.