Constituent Quarks and g_1

TL;DR

This paper reviews the proton spin problem, focusing on the transition from current to constituent quarks within QCD, highlighting theoretical developments and current understanding.

Contribution

It provides a comprehensive review of the theory and status of the proton spin problem, emphasizing the quark transition in QCD.

Findings

Insights into the current understanding of proton spin structure

Discussion of the transition between current and constituent quarks

Summary of theoretical approaches and challenges

Abstract

We review the theory and present status of the proton spin problem with emphasis on the transition between current quarks and constituent quarks in QCD.