Drell-Yan lepton angular distribution at small transverse momentum
Drell-Yan lepton angular distribution at small transverse momentum
We investigate the dependence of the Drell-Yan cross section on lepton polar and azimuthal angles, as generated by the lowest-order QCD annihilation and Compton processes. We focus, in particular, on the azimuthal-angular distributions, which are of the form $\mathrm{cos}\ensuremath{\phi}$ and $\mathrm{cos}2\ensuremath{\phi}$. At small transverse momentum ${q}_{T}$ of the lepton pair, …