Collinear Factorization Approaches to Heavy Quarkonium Production

Collinear factorization theorems of QCD are widely used in predictions for processes involving large momentum-transfer. Applications of these theorems range from exclusive and inclusive production of hadrons to production of heavy or energetic particles in high-energy hadron collisions. In exclusive and inclusive production of heavy quarkonia, collinear factorization theorems can be combined with effective field theories such as nonrelativistic QCD to constrain the non-perturbative degrees of freedom. In this presentation, I will discuss how collinear factorization theorems apply to heavy quarkonium production and consider factorization-violating effects related to the heavy quark mass.