Comparison of Inclusive Jet and Dijet Mass Cross Sections at $\sqrt{s}$ = 7TeV with Predictions of perturbative QCD

In view of the first measurements on jet cross sections at the LHC the question arises to which extent predictions of perturbative Quantum Chromodynamics hold at the new center-of-mass energy of $\sqrt{s}$=7TeV. In this note detailed comparisons of the published inclusive jet and dijet mass cross sections with calculations at next-to-leading order are presented using five recent sets of parton distribution functions including their uncertainties. Although lying systematically above the data, the theory predictions, corrected for non-perturbative effects, are still compatible within uncertainties with the double-differential jet production cross sections measured by the CMS experiment. The agreement is better in the case of a dijet topology with a larger jet size of $R=0.7$ as compared to $0.5$ for the inclusive jets. Discrepancies show up at higher rapidities.