Inclusive jet cross-sections and dijet azimuthal decorrelations with D0

TL;DR

This paper reports measurements of inclusive jet cross-sections and dijet azimuthal decorrelations at the D0 experiment, testing QCD predictions and exploring higher order effects in proton-antiproton collisions at 1.96 TeV.

Contribution

It provides the first detailed measurements of these observables at Tevatron energies, comparing results with next-to-leading order QCD calculations.

Findings

Jet cross-sections agree with NLO calculations.

Dijet azimuthal decorrelations are sensitive to higher order QCD effects.

Measurements are consistent with theoretical predictions except at large azimuthal angles.

Abstract

We present a preliminary measurement of the inclusive jet cross-sections based on an integrated luminosity of 378 pb^{-1} acquired with the D0 detector between 2002 and 2004 at a center of mass energy of \sqrt{s}=1.96 TeV and a measurement of azimuthal dijet decorrelations based on an integrated luminosity of 150 pb^{-1}. The cross section measurements are based on an iterative cone algorithm with a cone size of R=0.7. They are performed in two rapidity bins between 0.0 and 0.8. The measurements are in good agreement with next to leading order calculations. The azimuthal angle between the two leading jets is sensitive to higher order QCD effects. The measurement of dijet azimuthal decorrelations therefore probes these effects without explicitly reconstructing more than two jets. Except for large azimuthal angles where soft effects are important the measurements are well described by the next to leading order perturbation theory.