Review Article

Drell-Yan Process in TMD Factorization

Figure 7

The azimuthal asymmetries as the functions of (upper left), (upper right), (lower left), and (lower right) for the unpolarized Drell-Yan process considering the TMD evolution in the kinematical region of COMPASS. The shadow areas correspond to the uncertainty of the parameters in the parameterization of the Boer-Mulders function for proton in [62]. Figures from [61].