Abstract
The construction and performance of a large area time-of-flight detector for the DIRAC experiment at CERN is reported. With an average time resolution of 123ps per counter at rates up to 1MHz, it allows excellent separation of pπ− from π+π− pairs up to 4.6GeV/c momentum, as well as of Coulomb-correlated pion pairs from accidentals. The optimization of scintillator material, photomultiplier performance and readout electronics is described.
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