CERN Accelerating science

ATLAS Slides
Report number	ATL-PHYS-SLIDE-2022-519
Title	Measurement of multijet events and photon production with ATLAS
Author(s)	Carminati, Leonardo (Università degli Studi e INFN Milano (IT))
Corporate author(s)	The ATLAS collaboration
Collaboration	ATLAS Collaboration
Submitted to	Diffraction and Low-x 2022, Corigliano Calabro, Cosenza, Italy, 24 - 30 Sep 2022, pp.ATL-PHYS-SLIDE-2022-519
Submitted by	[email protected] on 04 Oct 2022
Subject category	Particle Physics - Experiment
Accelerator/Facility, Experiment	CERN LHC ; ATLAS
Free keywords	Event shapes ; Photon production ; Multijet ; QCD
Abstract	The production of jets at hadron provides stringent tests of perturbative QCD. We present the latest measurements using proton-proton collision data collected by the ATLAS experiment at ???s=13 TeV. We will discuss the measurement of new event-shape jet observables defined in terms of reference geometries with cylindrical and circular symmetries using the energy mover???s distance. The results are unfolded for detector effects and compared to the state-of-the-art next-to-leading order parton shower generators. If ready, the measurement of strong coupling constant will be presented using the ratio of 3-jet to 2-jet events. Finally, prompt inclusive photon production is measured for two distinct photon isolation cones, R=0.2 and 0.4, as well as for their ratio.
Related document	Conference Paper ATL-PHYS-PROC-2023-003