Abstract
Gflash is a parameterized simulation of electromagnetic and hadronic showers. It uses parameterizations of longitudinal and lateral shower profiles in homogeneous or sampling calorimeters taking into account an individual shower fluctuation and correlation. Gflash can take over the Geant4 based tracking at the first inelastic interaction inside calorimeters. It can be tuned flexibly to data and speed up the calorimeter simulation significantly for high energy particle showers. In this paper, the Gflash implementation developed for the CMS calorimeter and tuned to the CMS test beam data is described. The performance of Gflash is also presented.
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