Measurement of the Jet Energy Scale at DØ

Jets of hadrons are the most commonly produced objects at high-energy hadronic colliders. It is therefore important to identify and quantify jet energies in events. However, collisions involving interesting physical processes can overlap in time with additional collisions. This is especially troublesome at high luminosities, as such additional energy depositions in detectors can compromise the reconstruction of jets. The DØ detector at Fermilab relies mainly on the energy information obtained using its uranium/liquid-argon (LAr) sampling calorimetry. The experiment has developed a set of corrections, collectively known as the jet energy scale (JES), that translate jet energies measured in the detector to the energies carried by the produced particles. This correction is extracted from two-body events, separately for those observed in the detector and for the ones from Monte-Carlo simulation. The corrections include effects from the jet reconstruction algorithm, the response of the calorimeter and the impact of simultaneous interactions. We describe the JES correction used at DØ, focusing on the main contributions and discuss the precision achieved in the measurement of jet energy.