Abstract
The progress towards the realisation of the LHC-B Ring Imaging Cherenkov detector is reported.
Highlights
This paper reports on the development of the Ring Imaging Cherenkov (RICH) detector for LHC-B
Additional modifications will be needed to meet the requirements of the pad hybrid photodiodes (HPDs) for LHC-B, in particular the multiplexing properties of the chip
The major outstanding issue for the LHC-B RICH detector is the demonstration of a photodetector that matches LHC-B requirements
Summary
This paper reports on the development of the Ring Imaging Cherenkov (RICH) detector for LHC-B. The many B-meson decay modes to be studied makes it necessary to have π/K separation over a momentum range of 1 < p < 150 GeV/c This reduces the background of the selected final state and, in addition, provides an efficient flavour tag of the signal B-meson. RICH detectors meet the experimental criteria for particle identification in the required momentum range. It is proposed to use two RICH detectors in the LHC-B experiment, see fig 1. A spherical mirror with a radius of curvature of 190 cm is tilted by ≈ 250 mrad to reflect the Cherenkov light onto an array of photodetectors situated outside the experimental acceptance. Two candidate technologies exists [3]: hybrid photodiodes (HPDs) and multianode photomultipliers These detectors are commercially available but not in designs that meet the experimental needs of LHC-B. A program of R&D is currently underway on the development of a HPD with a large active area
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