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The branching ratio (BR) for the decay K+→π+νν̄ is a sensitive probe for new physics. The NA62 experiment at the CERN SPS will measure this BR to within about 10%. To reject the dominant background from channels with final state photons, the large-angle vetoes (LAVs) must detect photons of energy as low as 200 MeV with an inefficiency of less than 10−4, as well as provide energy and time measurements...
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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