Transversity in Exclusive and Inclusive Processes

TL;DR

The paper investigates how transversity can be accessed in both exclusive and inclusive processes by examining the role of rescattering and intrinsic transverse momentum. Using an Exchange Picture and a quark-diquark rescattering model, it links transversity to quark orbital angular momentum and to T-odd distributions that generate single-spin and azimuthal asymmetries. It predicts a sizable cos2φ asymmetry in SIDIS at HERMES kinematics arising from h1^⊥(1) and H1^⊥(1), and emphasizes the essential role of final-state interactions in enabling these observables. Overall, the work highlights the interconnectedness of transversity, orbital dynamics, and rescattering across both exclusive and inclusive scattering regimes, with concrete phenomenological predictions for experiments.

Abstract

Both meson photoproduction and semi-inclusive deep inelastic scattering can potentially probe transversity properties of the nucleon. We explore how that potential can be realized dynamically. The role of rescattering in both exclusive and inclusive meson production as a source for single spin asymmetries is examined. Using a dynamical model, we evaluate the spin independent $\cos 2φ$ asymmetry associated with transversity of quarks inside unpolarized hadrons, at HERMES kinematics. We also explore the effects of rescattering on the transversity distribution of the nucleon.

Figures (1)

• Figure 1: Left Panel: The ${\langle \cos2\phi \rangle}_{UU}$ asymmetry for $\pi^+$ production as a function of $x$. Right Panel: The ${\langle \cos2\phi \rangle}_{UU}$ asymmetry for $\pi^+$ production as a function of $z$.