D. Peralta

The performance of the HERA-B RICH at high track densities

Abstract The performance of the ring imaging Cherenkov counter (RICH) for the HERA-B experiment has been evaluated. The measured values of the basic parameters such as the number of detected photons per ring and Cherenkov angle resolution are found to agree with a priori estimates. Also at higher track densities, the detector is capable of identifying individual rings. Particle identification has been achieved by determining the momentum from tracks in the vertex detector and main tracking system, hits in the electromagnetic calorimeter and track directions as measured by the RICH.

Backsplash studies for the Scintillator Pad Detector of LHCb in a tagged-photon test beam

The Scintillator Pad Detector (SPD) of the LHCb experiment is part of the calorimeter system, positioned just before the preshower (PS), and is meant to separate photons and electrons at level 0 of the trigger. A tagged-photon test beam allowed to test in photon signals the SPD. These signals are mainly due to pair production inside the scintillator and to particles generated in the electromagnetic shower in the PS and in the electromagnetic calorimeter (backsplash). The observed results in a test beam experiment stress the low inefficiencies in e/γ separation arising from backsplash.

Using ASD8 as readout of multianode photomultipliers for single photoelectron discrimination in the HERA-B RICH detector

Abstract ASD8 is the analog front end chosen to read out the photodetectors of the HERA-B RICH. A test of 1791 boards was performed to study which were the best operating conditions, to make a quality assessment and to optimize the distribution of the boards on the RICH focal plane. Nevertheless, some drawbacks are apparent when a board designed for tracker detectors is employed to convert a photomultiplier signal.