Measurement of the response of the ATLAS liquid argon barrel calorimeter to electrons at the 2004 combined test-beam

Measurement of the Inclusive Jet Cross Section with the ATLAS Detector at the Large Hadron Collider

“…The cluster energy and position needs to be determined precisely starting from the visible energy deposited in the cells and taking into account the shower development in the sampling calorimeters, the energy deposited upstream the calorimeter (using information from the presampler), the leakage outside the calorimeters and the modulations of the energy in η and φ due to the accordion geometry. These factors and the calibration constants for the electronics (including corrections for known high voltage problems) have been derived and validated using electron and muon test beams and Monte Carlo simulation [65,[70][71][72][73][74][75][76]. The systematic uncertainty on the electron energy scale after this calibration procedure amounts to 3%.…”

“…• The difference in the electromagnetic scale between the test-beam setup and the full ATLAS detector due to the uncertainty in the liquid argon temperature in the test-beam, derived from comparison of different test-beam measurements [65,72];…”

“…• The difference in pulse reconstruction methods and calibration corrections between the test-beam and ATLAS setup [72,77];…”

“…An optimal filtering algorithm is used to extract the amplitude, timing and pedestal from the pulse shape [79]. The ADC counts that are the output of the photomultipliers are converted into an energy measurement using correction constants derived from test beam measurements [65,[71][72][73]80] and propagated to the full ATLAS setup using a charge injection calibration system [79]. The absolute calorimeter response to energy deposited via electromagnetic processes has also been validated in the hadronic calorimeters using muons, both from test-beams [80] and produced by cosmic-rays in-situ [81].…”

“…Simulated detector geometries that include systematic variations to the material budget have been designed using test-beam measurements [72], in addition to studies in 900 GeV and 7 TeV data [96,97,130,131]. Specific Monte Carlo samples have been reconstructed using these distorted geometries.…”