Comparison between Geant4, Fluka and the TileCal test-beam data

We present a study of the signal produced by charged pions of energies ranging between 20 and 350 GeV in modules of ATLAS tile calorimeter. The results from test beam data are compared to the predictions of different Monte Carlo simulations (Geant4 and Fluka). The goal is to assess in a quantitative way how well different Monte Carlo codes can reproduce the distribution of visible energy in the calorimeter and the details of the hadronic shower.