Polarized Structure Functions in the Valence Quark and Resonance Regions and the GDH Sum

TL;DR

This paper discusses measurements of neutron spin structure functions using polarized helium-3 at Jefferson Lab, aiming to understand nucleon spin origins and test QCD in the strong interaction regime.

Contribution

It reports on experimental measurements of spin-dependent structure functions in the valence quark and resonance regions, providing new data to test QCD predictions.

Findings

Measured spin structure functions in various kinematic regions

Provided data for testing QCD sum rules

Enhanced understanding of nucleon spin composition

Abstract

I present in this paper the neutron spin physics program in Hall A at Jefferson Laboratory using a polarized helium-3 target. The program encompasses several completed experiments, in which, valuable spin observables (spin dependent structure functions) were measured in order to learn about how the nucleon spin arises from the behavior of the constituents. These experiments also offer a ground for testing our understanding of the strong regime of quantum chromodynamics (QCD) the theory of strong interactions through the determination of moments of these structure functions.