Abstract
CMS experiment has designed a strategy to validate GEANT4 physics models using collision data from the Large Hadron Collider. Isolated charged particles are measured simultaneously in the tracker as well as in the calorimeters. These events are selected using dedicated triggers and are used to measure the response in the calorimeter. Measurements of mean response, resolution, energy sharing between the electromagnetic and hadron calorimeters, shower shapes are directly compared with predictions from the Monte Carlo. Single particle response is also used in calibrating the calorimeters and in improving jet energy measurements. GEANT4 physics models are also used to understand the source of anomalous high energy deposits in the calorimeter.
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