Dynamics of isolated-photon plus jet production in pp collisions at sqrt(s)=7 TeV with the ATLAS detector

TL;DR

This paper presents measurements of isolated-photon plus jet production in proton-proton collisions at 7 TeV using the ATLAS detector, comparing results with next-to-leading-order QCD calculations to test theoretical models.

Contribution

First measurement of isolated-photon plus jet cross sections as functions of multiple kinematic variables at 7 TeV with the ATLAS detector, providing data for QCD validation.

Findings

QCD calculations agree well with data except for azimuthal angle distributions.

Cross sections measured as functions of photon energy, jet momentum, and rapidity.

Data helps refine theoretical models of photon-jet production.

Abstract

The dynamics of isolated-photon plus jet production in pp collisions at a centre-of-mass energy of 7 TeV has been studied with the ATLAS detector at the LHC using an integrated luminosity of 37 pb-1. Measurements of isolated-photon plus jet bin-averaged cross sections are presented as functions of photon transverse energy, jet transverse momentum and jet rapidity. In addition, the bin-averaged cross sections as functions of the difference between the azimuthal angles of the photon and the jet, the photon--jet invariant mass and the scattering angle in the photon--jet centre-of-mass frame have been measured. Next-to-leading-order QCD calculations are compared to the measurements and provide a good description of the data, except for the case of the azimuthal opening angle.