Measurement of inclusive jet and dijet production in pp collisions at sqrt(s) = 7 TeV using the ATLAS detector

TL;DR

This paper reports measurements of inclusive jet and dijet production cross sections in proton-proton collisions at 7 TeV using the ATLAS detector, testing QCD predictions and constraining parton distribution functions.

Contribution

First measurement of jet and dijet cross sections at 7 TeV in a broad kinematic range with detailed comparison to QCD calculations.

Findings

Data agree with next-to-leading order QCD predictions within uncertainties.

Results extend the kinematic reach for jet measurements at the LHC.

Provides new constraints on parton distribution functions in unexplored regions.

Abstract

Inclusive jet and dijet cross sections have been measured in proton-proton collisions at a centre-of-mass energy of 7 TeV using the ATLAS detector at the Large Hadron Collider. The cross sections were measured using jets clustered with the anti-kT algorithm with parameters R=0.4 and R=0.6. These measurements are based on the 2010 data sample, consisting of a total integrated luminosity of 37 inverse picobarns. Inclusive jet double-differential cross sections are presented as a function of jet transverse momentum, in bins of jet rapidity. Dijet double-differential cross sections are studied as a function of the dijet invariant mass, in bins of half the rapidity separation of the two leading jets. The measurements are performed in the jet rapidity range |y|<4.4, covering jet transverse momenta from 20 GeV to 1.5 TeV and dijet invariant masses from 70 GeV to 5 TeV. The data are compared to expectations based on next-to-leading order QCD calculations corrected for non-perturbative effects, as well as to next-to-leading order Monte Carlo predictions. In addition to a test of the theory in a new kinematic regime, the data also provide sensitivity to parton distribution functions in a region where they are currently not well-constrained.