To measure CP violation it is not only necessary to measure the decay of the B meson but also to tag its initial flavour via the decay of the accompanying B, as shown schematically in fig. 4. The generic detector requirements for an experiment to study B decays are that it has good resolution on measuring the decay time and the mass of decayed B mesons and has particle identification to allow a good initial flavour tag of the B meson. The characteristics of the detectors designed to study CP violation are discussed below.
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