A Parametrization for Fast Simulation of Muon Tracks in the ATLAS Inner Detector and Muon System

The simulation of physics processes and of their measurements is a basic tool in high energy physics. Theoretical and phenomenological considerations are implemented in Monte Carlo models, simulating the response of the detector to particles passing through the active and passive detector material. This so-called full simulation is however a complicated and time-consuming activity. For very large event samples or processes very time consuming, the full simulation is not possible and has to be replaced by a parametric fast simulation. A new parametrisation for muon tracks in the Inner Detector and the Muon System of the ATLAS experiment is presented in this document, including a sample algorithm chain to extract the parameter files from full simulated and reconstructed data. Results of full and fast simulation are compared using the potential Higgs decay channel H->ZZ*->4mu.