Rapidity distributions in exclusive Z+jet and γ+jet events in pp collisions at √s=7 TeV
Khachatryan, Vladimir A.
Baarmand, Marc M.
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Rapidity distributions are presented for events containing either a Z boson or a photon with a single jet in proton-proton collisions produced at the CERN LHC. The data, collected with the CMS detector at ffiffiffis p ¼ 7 TeV, correspond to an integrated luminosity of 5:0 fb 1. The individual rapidity distributions of the boson and the jet are consistent within 5% with expectations from perturbative QCD. However, QCD predictions for the sum and the difference in rapidities of the two final-state objects show discrepancies with CMS data. In particular, next-to-leading-order QCD calculations, and two common Monte Carlo event generators using different methods to match matrix-element partons with parton showers, appear inconsistent with the data as well as with each other.