Investigating Partons' Transverse Spin with Deep Inelastic Exclusive Experiments

TL;DR

This paper explores how deep inelastic exclusive experiments can reveal the transverse spin structure of partons, specifically through GPDs related to transversity, and discusses the potential of EIC experiments to probe strange and charmed meson production.

Contribution

It demonstrates how exclusive meson production experiments can isolate chiral odd GPDs linked to transversity and analyzes the role of EIC in probing non-perturbative charm contributions.

Findings

Deeply virtual pseudoscalar meson production isolates chiral odd GPDs.

EIC can uniquely identify non-perturbative charm in nucleons.

Analysis of dispersion relations and parton model extensions in ERBL region.

Abstract

We show how deeply virtual pseudoscalar meson production experiments single out the contribution of the four chiral odd quark-proton GPDs which are related to the so far elusive transversity distribution function, $h_1$. Furthermore, in the kinematical ranges of the proposed EIC, electroproduction of strange and charmed mesons will allow one to uniquely pin down the non-perturbative charmed component in the nucleon structure function, and at the same time provide new insights in the connection of the quark/gluon degrees of freedom with the meson-baryon description. The use of dispersion relations as well as the naive extension of the parton model to the ERBL region are critically analyzed.