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Difficulties in the description of Drell-Yan processes at moderate invariant mass and high transverse momentum
We study the Drell-Yan cross section differential with respect to the transverse momentum of the produced lepton pair. We consider data with moderate invariant mass $Q$ of the lepton pair, between 4.5 and 13.5 GeV, and similar (although slightly smaller) values of the transverse momentum ${q}_{T}$. We approach the problem …