Simulation of the response of a silicon pixel detector

A model to simulate the response of a silicon pixel detector is described. The effects of geometrical charge sharing, electronic noise, threshold dispersion, capacitive coupling between pixel channels and δ-rays production have been taken into account. The model has been tested on the Omega3 chip, which is the direct predecessor of the ALICE pixel detector, to be used in the inner tracking system of the ALICE experiment. The model is able to reproduce the experimental data and the resulting parameters are consistent with the measurements made on the Omega3 chip.