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Predictions for Drell--Yan lepton pair production at low dilepton mass andsmall x at the LHC usually have a large scale dependence. This can be decreasedby determining an "optimal factorization scale". In this paper, we reduce thisscale by imposing a cutoff in azimuthal angle between the transverse momentumof the leptons, properly taking into account Sudakov effects. This allows oneto probe the parton distributions at smaller scales eliminating most of thecurrent theoretical uncertainty.

Improving the Drell--Yan probe of small x partons at the LHC via an azimuthal angle cut