Summary
ATLAS relies on very large samples of simulated events for delivering high-quality and competitive physics results, but producing these samples takes much time and is very CPU intensive when using the full GEANT4 detector simulation. Fast simulation tools are a useful way of reducing CPU requirements when detailed detector simulations are not needed. During the LHC Runs 1 and 2, a fast calorimeter simulation (FastCaloSim) was successfully used in ATLAS. FastCaloSim provides a simulation of the particle energy response at the calorimeter read-out cell level, taking into account the detailed particle shower shapes and the correlations between the energy depositions in the various calorimeter layers. It is interfaced to the standard ATLAS digitization and reconstruction software, and it can b
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