Chiral-odd GPDs in large-N_c QCD

TL;DR

This paper analyzes the flavor structure of chiral-odd generalized parton distributions in nucleons within large-N_c QCD, revealing specific flavor dominance patterns consistent with experimental data on meson electroproduction.

Contribution

It provides a theoretical analysis of flavor structures of chiral-odd GPDs in the large-N_c limit, connecting QCD predictions with experimental observations.

Findings

u - d flavor-nonsinglet component is leading in H_T and E_T-tilde

u + d flavor-singlet component dominates E_T and H_T-tilde

Results align with flavor structure from meson electroproduction data

Abstract

We study the flavor structure of the nucleon's chiral-odd generalized parton distributions (transversity GPDs) in the large-N_c limit of QCD. It is found that in the distributions H_T and E_T-tilde the flavor-nonsinglet component u - d is leading in the 1/N_c expansion, while in E_T and H_T-tilde it is the flavor-singlet component u + d. This pattern is consistent with the flavor structure extracted from hard exclusive pi^0 and eta electroproduction data, assuming that the processes are dominated by the twist-3 mechanism involving the chiral-odd pseudoscalar meson distribution amplitudes.