System Tests of the Lhcb Rich Detectors in A Charged Particle Beam

The RICH detectors of the LHCb experiment will provide efficient particle identification over the momentum range 1–100 GeVc. Results are presented from a beam test of the LHCb RICH system using final production pixel Hybrid Photon Detectors, the final readout electronics and an adapted version of LHCb RICH reconstruction software. Measurements of the photon yields and Cherenkov angle resolutions for both nitrogen and C4F10 radiators agree well with full simulations. The quality of the data and the results obtained demonstrate that all aspects meet the stringent physics requirements of the experiment are now ready for first data.