A detailed study of hadronic interactions is presented using data recorded
with the highly granular CALICE silicon-tungsten electromagnetic calorimeter.
Approximately 600,000 selected negatively changed pion events at energies
between 2 and 10 GeV have been studied. The predictions of several physics
models available within the GEANT4 simulation tool kit are compared to this
data. Although a reasonable overall description of the data is observed, there
are significant quantitative discrepancies in the longitudinal and transverse
distributions of reconstructed energy.
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