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The NA62 experiment at CERN aims to measure the branching ratio of the ultra-rare charged kaon decay K + → π + ν ν ¯ with a 10% accuracy and with a background contamination at the 10% level. Since the branching ratio of this decay is O (10 −10 ), to fulfill such request one of the main backgrounds, the decay K + → μ + ν (BR ~ 63 % ), must be suppressed by a rejection factor of 4×10 −13 (assuming 10% signal acceptance). This can be partially accomplished using a combination of kinematical cuts (8×10 −6 ) and the different power of penetration through matter of pions and muons (10 −5 ). A further 5×10 −3 suppression factor will be provided by a RICH detector, in a momentum range between 15 and 35 GeV/c. The details of the RICH project as well as the results from test runs performed on a RICH prototype of the same length of the final detector will be presented. The current status of the construction and the description of the final readout and trigger electronics will also be reviewed. [ABSTRACT FROM AUTHOR]

Abstract: A Ring Imaging Cherenkov (RICH) detector is the key element for particle identification in the NA62 experiment at CERN. Its purposes are to distinguish pions from muons in the momentum range from 15GeV/c to 35GeV/c with a muon suppression factor at the 0.5% level, to measure the particle arrival time with better than 100ps resolution and to provide the reference time and a fast signal for the trigger system. This paper describes the updated detector design, the present status of the construction, the final results of a prototype beam test and a possible application of Graphics Processing Units in the NA62 trigger system based on RICH information. [Copyright &y& Elsevier]

The trigger used for the collection of the samples of K0→π0π0 decays in the NA48 experiment at CERN uses a novel pipeline design in order to satisfy the demanding specifications of a high rate kaon beam. The trigger algorithms, architecture and performance are described. [Copyright &y& Elsevier]