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The NA62 experiment at CERN SPS, aimed to measure ~80 events of very rare decay K+?? ??+ ?? anti-v (BR~8.5??10-10), poses stringent requirements on PID capabilities to reject the overwhelming K??2(63%) and K??2(21%) backgrounds. The photon veto system must provide a rejection factor of 10-8 on ??0 decays. As main ?? veto detector, the NA48 liquid Kr calorimeter will be used. To have full geometrical...
The P326 experiment at the CERN SPS has been proposed with the purpose of measuring the branching ratio for the decay K+ rarrpi+nunu macrto within ~10%. The photon veto system must provide a rejection factor of 108 for pideg decays. We have explored two designs for the large-angle veto detectors, one based on scintillating tiles and the other using scintillating fibers. We have constructed a prototype...
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