CERN Accelerating science

ATLAS Slides
Report number	ATL-PHYS-SLIDE-2010-274
Title	Single isolated hadron response and determination of the jet energy scale uncertainty with the ATLAS detector
Author(s)	Vivarelli, I (Freiburg)
Corporate author(s)	The ATLAS collaboration
Submitted to	35th International Conference on High Energy Physics, Paris, France, 22 - 28 Jul 2010
Submitted by	iacopo.vivarelli@cern.ch on 08 Sep 2010
Subject category	Detectors and Experimental Techniques
Accelerator/Facility, Experiment	CERN LHC ; ATLAS
Free keywords	JETETMISS
Abstract	The response of single isolated hadrons in the ATLAS calorimeter is measured in proton-proton collisions at a centre-of-mass energy of 7 TeV at the LHC. Isolated tracks with a momentum between 0.5 to 10-20 GeV are selected in the rapidity region up to 2.3. Adjacent energy deposits collected in calorimeter clusters are summed together in a cone of size R=0.2. The measured calorimeter cluster energy sum is compared to the track momentum. Data are in compared in detail to Monte Carlo simulation based on the Geant4 tool-kit and to test-beam measurements. The response to hadrons at low momenta is described by the Monte Carlo simulation with an accuracy of a few percent. Together with test-beam data the results of the single isolated hadron analysis can be used to get a first estimate of the jet energy scale uncertainty in the ATLAS detector.