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

摘要

High precision data of lepton angular distributions for γ~*=Z production in pp collisions at the LHC, covering broad ranges of dilepton transverse momenta (q_T ) and rapidity (y), were recently reported. Strong q_T dependencies were observed for several angular distribution coefficients, A_i, including A_0 - A_4. Significant y dependencies were also found for the coefficients A_1, A_3 and A_4, while A_0 and A_2 exhibit very weak rapidity dependence. Using an intuitive geometric picture, we show that the q_T and y dependencies of the angular distributions coefficients can be well described.