TMDs and polarized Drell-Yan process
Jian Zhou
LBNL
In this talk, I will discuss the spin-dependent quark distributions at large
transverse momentum. We derive their transverse momentum dependent behaviors
in the collinear factorization approach. We further calculate the angular
distribution of the Drell-Yan lepton pair production with polarized beams and
present the results in terms of the collinear twist-3 correlation functions.
In the intermediate transverse momentum region, our explicit calculations
have shown that the collinear factorization and the transverse momentum
dependent factorization approaches are consistent in the description of the
lepton pair angular distributions.