Simulation and Reconstruction of the RICH Upgrade Test Beam

The particle identification using the RICH detector is an essential component of the LHCb experiment. For the upcoming RICH upgrade, which is foreseen for the year 2018, prototypes of the new detector components were tested in a test beam by the RICH upgrade group. A full Geant4 simulation of the set up was created for this purpose. Results obtained from reconstructing the Monte Carlo events were compared with those from the data which was taken during the test beam. This resulted in the measurement of the photon yield and Cherenkov angle resolution. In order to perform the online monitoring of the test beam and event display program was created.