Inclusive Jet Production Measured with ATLAS and Constraints on PDFs

TL;DR

This paper reports measurements of inclusive jet and dijet cross sections at 7 TeV with ATLAS, testing QCD predictions and constraining parton distribution functions in previously unexplored kinematic regions.

Contribution

It provides the first detailed measurements of jet cross sections at high energies and rapidities, offering new data to refine parton distribution functions.

Findings

Data agree with NLO QCD predictions within uncertainties.

Results improve constraints on PDFs at high momentum fractions.

Measurements extend the kinematic reach of jet cross section data.

Abstract

Inclusive jet and dijet double-differential cross sections have been measured in proton-proton collisions at a centre-of-mass energy of 7 TeV using the ATLAS detector at the LHC. The cross sections were measured using jets clustered with the anti-kt algorithm. 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. The data test the theory in a new kinematic regime, and provide sensitivity to parton distribution functions in a region where they are currently not well constrained.