Speaker: Zhongbo Kang (Iowa State University) Title: QCD Collinear Factorization Approach to Single Transverse-Spin Asymmetry Abstract: Single transverse-spin asymmetries (SSAs) have received much attention in recent years, both experimentally and theoretically. In this talk, I will discuss some recent developments in QCD collinear factorization approach to the SSAs. I will first explain why and how the SSAs can directly probe a set of new three-parton correlation functions, which represent non-perturbative quantum correlations of quarks and gluons inside a polarized hadron. I will then discuss the evolution and physical meaning of these correlation functions. Finally I will explore the future opportunities in the SSA measurements.