Dependencies of lepton angular distribution coefficients on the transverse momentum and rapidity of Z bosons produced in pp collisions at the LHC

High precision data of lepton angular distributions for γ∗/Z production in pp collisions at the LHC, covering broad ranges of dilepton transverse momenta (qT) and rapidity (y), were recently reported. Strong qT dependencies were observed for several angular distribution coefficients, Ai, including A0-A4. Significant y dependencies were also found for the coefficients A1, A3 and A4, while A0 and A2 exhibit very weak rapidity dependence. Using an intuitive geometric picture, we show that the qT and y dependencies of the angular distributions coefficients can be well described.