Measurement of inclusive jet and dijet cross sections in proton-proton collisions at 7 TeV centre-of-mass energy with the ATLAS detector

TL;DR

This paper reports the first measurement of inclusive jet and dijet cross sections in proton-proton collisions at 7 TeV using the ATLAS detector, validating QCD predictions in a new energy regime.

Contribution

It provides the first measurement of jet cross sections at 7 TeV with detailed analysis and comparison to NLO QCD predictions, using the anti-kt algorithm.

Findings

Jet energy scale uncertainty is within 7%.

Measured cross sections agree with NLO QCD expectations.

Validated QCD in a new kinematic regime.

Abstract

Jet cross sections have been measured for the first time in proton-proton collisions at a centre-of-mass energy of 7 TeV using the ATLAS detector. The measurement uses an integrated luminosity of 17 nb-1 recorded at the Large Hadron Collider. The anti-kt algorithm is used to identify jets, with two jet resolution parameters, R = 0.4 and 0.6. The dominant uncertainty comes from the jet energy scale, which is determined to within 7% for central jets above 60 GeV transverse momentum. Inclusive single-jet differential cross sections are presented as functions of jet transverse momentum and rapidity. Dijet cross sections are presented as functions of dijet mass and the angular variable $\chi$. The results are compared to expectations based on next-to-leading-order QCD, which agree with the data, providing a validation of the theory in a new kinematic regime.