Jianwei Qiu

Iowa State University, Ames

TMD factorization and parton's transverse motion

Protons and neutrons are known to be the building blocks of matter, and also known to be the bound states of quarks and gluons - the partons, whose dynamics is best described by Quantum Chromodynamics (QCD). Perturbative QCD has been very successful in interpreting and predicting high-energy scattering processes, in extracting the information on short-distance partonic dynamics, and in measuring the parton momentum distribution inside a nucleon. With the advance in experimental technique and precision, it became possible in recent years to probe parton's transverse motion and multiparton correlations inside a hadron. In this talk, I will discuss how to relate the parton's transverse motion to physical observables. I will then review recent theoretical advances in transverse momentum dependent (TMD) factorization for hard processes, since much of the predictive content of perturbative QCD is contained in factorization theorems. Finally, I will discuss the current effort and status in determining the TMD parton distributions and multiparton correlation functions.

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