Measurement of the differential cross section for the production of an isolated photon with associated jet in ppbar collisions at sqrt(s)=1.96 TeV
Abstract
The process ppbar -> photon + jet + X is studied using 1.0 fb-1 of data collected by the D0 detector at the Fermilab Tevatron ppbar collider at a center-of-mass energy sqrt(s)=1.96 TeV. Photons are reconstructed in the central rapidity region |ygamma|<1.0 with transverse momenta in the range 30<Ptgamma<400 GeV while jets are reconstructed in either the central |yjet|<0.8 or forward 1.5<|yjet|<2.5 rapidity intervals with Ptjet>15 GeV. The differential cross section d3sigma/dPtgamma dygamma dyjet is measured as a function of Ptgamma in four regions, differing by the relative orientations of the photon and the jet in rapidity. Ratios between the differential cross sections in each region are also presented. Next-to-leading order QCD predictions using different parameterizations of parton distribution functions and theoretical scale choices are compared to the data. The predictions do not simultaneously describe the measured normalization and Ptgamma dependence of the cross section in any of the four measured regions.