CERN Accelerating science

ATLAS Slides
Report number	ATL-PHYS-SLIDE-2017-150
Title	High-ET isolated-photon plus jets production in pp collisions at sqrt(s)=8 TeV with the ATLAS detector
Author(s)	De la Torre, Hector (Michigan State University, Department of Physics and Astronomy)
Corporate author(s)	The ATLAS collaboration
Collaboration	ATLAS Collaboration
Submitted to	25th International Workshop on Deep Inelastic Scattering and Related Topics, Birmingham, UK, 03 - 07 Apr 2017
Submitted by	[email protected] on 08 Apr 2017
Subject category	Particle Physics - Experiment
Accelerator/Facility, Experiment	CERN LHC ; ATLAS
Free keywords	QCD ; EGAMMA ; JETETMISS
Abstract	The production of prompt photons in association with jets in proton–proton collisions provides a testing ground for perturbative QCD (pQCD) with a hard colourless probe less affected by hadronisation effects than jet production. The measurements of the angular correlations between the photon and the jets can be used to probe the dynamics of the hard-scattering process. We present here a cross-section measurement using final states with at least one, two or three hadronic jets in addition to an isolated photon, differential in a wide range of kinematic variables describing the photon+jet production dynamic. Colour-coherence effects were investigated in events with a photon accompanied by two jets. The results are compared to recent theoretical predictions. The production of multi-jet final states at hadron colliders probes pQCD at several mass scales. The processes can also be used to probe the gluon density function of the proton.