Transverse momentum dependent twist-three result for polarized Drell-Yan   processes
  We study the polarized Drell-Yan processes from the collision of two spin-1/2 hadrons at order 1/Q based on the framework of transverse momentum dependent factorization.We give the complete twist-three results of total sixteen independent structure functions in terms of twist-two and twist-three transverse momentum dependent distribution functions. 
Zhun Lu, Ivan Schmidt
hep-ph