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Energy-Calibration of the ATLAS Hadronic and Electromagnetic Liquid-Argon Endcap Calorimete
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February 2, 2008 3:34 WSPC/Trim Size: 9in x 6in for Proceedings menke
ENERGY-CALIBRATION OF THE ATLAS HADRONIC AND
ELECTROMAGNETIC LIQUID-ARGON ENDCAP
CALORIMETERS
SVEN MENKE?
Max-Planck-Institut fu?r Physik
(Werner-Heisenberg-Institut)
Fo?hringer Ring 6, 80805 Mu?nchen, Germany
E-mail: menke@mppmu.mpg.de
In 2002 the first combined beam test of the hadronic and electromagnetic liquid-
argon endcap calorimeters of the ATLAS experiment took place at the SPS test
beam at CERN. A total of 15 million events from electrons, muons and pions in
the energy range from 6 to 200GeV were recorded. The entire calibration chain,
from digital filter weights, over calibration constants, to clustering and energy
weights, as is relevant for the energy calibration of hadronic and electromagnetic
showers in ATLAS was tested and applied to the beam test data. The calibration
methods and first results for the combined performance of the two calorimeters are
presented.
1. Introduction
1.1. The ATLAS Hadronic and Electromagnetic Endcap
Calorimeters
The ATLAS hadronic (HEC) and electromagnetic (EMEC) liquid-argon
endcap calorimeters 1?3 have to provide accurate measurements of jet en-
ergies and directions, missing transverse energy and particle identification
in the pseudo-rapidity range 1.5 ≤ |η| ≤ 3.2. Methods relevant for the
energy calibration in ATLAS and first results of the combined performance
are subject of this presentation.
1.2. The 2002 Beam Test Setup
1/8 wheel of the EMEC was placed in front of 3 out of 32 HEC1 modules and
2 out of 32 HEC2 half-modules in a cryostat in the H6 test beam area at the
?on behalf of the ATLAS Liquid Argon Collaboration
1
February 2, 2008 3:34 WSPC/Trim Size: 9in x 6in for Proceedings menke
2
CERN SPS. The restriction to 2 half modules of the second HEC wheel was
mainly due to space constraints given by the cryostat. The 2 HEC2 half-
modules were
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