The pixel hybrid photon detectors for the LHCb-rich project

This paper describes a hybrid photon detector with integrated silicon pixel readout to be used in the ring imaging Cherenkov detectors of the LHCb experiment. The photon detector is based on a cross-focussed image intensifier tube geometry where the image is de-magnified by a factor of 5. The anode consists of a silicon pixel array, bump-bonded to a binary readout chip with matching pixel electronics. The paper starts with the general specification of the baseline option, followed by a summary of the main results achieved so far during the R&D phase. It concludes with a description of the remaining work towards the final photon detector.