Accessing Generalized Transversity Distributions with Exclusive $\pi^o$ Electroproduction

TL;DR

This paper explores how exclusive $b0$ electroproduction can be used to access generalized transversity distributions, combining partonic GPD models and Regge theory to connect experimental observables with nucleon structure.

Contribution

It introduces a combined approach using a spectator model and Regge theory to study chiral-odd GPDs in $b0$ electroproduction, providing new insights into transversity.

Findings

GPDs can be accessed through cross sections and asymmetries in $b0$ electroproduction.

The model relates partonic GPDs to hadronic Regge exchanges.

Results suggest measurable sensitivity to transversity parameters like the tensor charge.

Abstract

Exclusive $\pi^0$ electroproduction from nucleons at large $Q^2$ can be described by Generalized Parton Distributions (GPDs), particularly the chiral odd subset related to transversity. These GPDs can be accessed experimentally from various cross sections and asymmetries. We calculate these GPDs in a spectator model, constrained by boundary functions. Alternatively, in a hadronic picture the meson production amplitudes correspond to C-odd Regge exchanges with final state interactions. The helicity structure provides relations between the partonic and the hadronic, Regge description of C-odd, chiral-odd processes. Calculations show how the tensor charge and other transversity parameters can be