CERN Accelerating science

ATLAS Note
Report number	ATL-LARG-PROC-2010-011
Title	Tests of Local Hadron Calibration Approaches in ATLAS Combined Beam Tests
Author(s)	Grahn, KJ (Royal Inst. Tech., Sodertalje) ; Kiryunin, A (Munich, Max Planck Inst.) ; Pospelov, G (Munich, Max Planck Inst.)
Corporate Author(s)	The ATLAS collaboration
Publication	2010
Imprint	06 Sep 2010
Number of pages	6
In:	14th International Conference On Calorimetry In High Energy Physics, Beijing, China, 10 - 14 May 2010
Subject category	Detectors and Experimental Techniques
Accelerator/Facility, Experiment	CERN LHC ; ATLAS
Free keywords	calorimeter ; liquid ; argon ; combined ; testbeam ; endcap ; barrel ; hadron ; calibration
Abstract	Three ATLAS calorimeters in the region of the forward crack at $|eta| = 3.2$ in the nominal ATLAS setup and a typical section of the two barrel calorimeters at $|eta| = 0.45$ of ATLAS have been exposed to combined beam tests with single electrons and pions. Detailed shower shape studies of electrons and pions with comparisons to various Geant4 based simulations utilizing different physics lists are presented for the endcap testbeam. The local hadronic calibration approach as used in the full Atlas setup has been applied to the endcap testbeam data. An extension of it using layer correlations has been tested with the barrel test beam data. Both methods utilize modular correction steps based on shower shape variables to correct for invisible energy inside the reconstructed clusters in the calorimeters (compensation) and for lost energy deposits outside of the reconstructed clusters (dead material and out-of-cluster deposits). Results for both methods and comparisons to Monte-Carlo simulations are presented.
Copyright/License	Preprint: (License: CC-BY-4.0)

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