First Measurement of Inclusive Jet Production Cross Sections in Proton Proton Collisions at a Centre-of-Mass Energy of 7 TeV with the ATLAS Detector

Jet production cross sections have been measured for the first time in proton-proton collisions at a centre–of–mass energy of 7 TeV with the ATLAS detector. The measurement uses the first data recorded at the Large Hadron Collider (LHC) corresponding to an integrated luminosity of 17 nb−1. The anti-kt algorithm with two jet resolution parameters, R = 0.4 and 0.6, is used to identify jets. Inclusive single differential jet cross sections are presented as functions of jet transverse momentum and rapidity. Jets up to transverse momenta of 600 GeV and with rapidities of |y| < 2.8 are measured. Dijet cross sections are presented as functions of di–jet mass and the rapidity difference of the two leading jets. The total uncertainty on the cross section measurement is dominated by the jet energy scale, which is determined to below 7% for central jets above 60 GeV transverse momentum. Themeasurement agrees well with the NLO QCD predictions, providing a validation of the theory in a new kinematic regime.