CERN-PS-195()
TESTS OF CP VIOLATION WITH KBAR0 AND K0 AT LEAR
()
- Proposed: Jan 21, 1985,
- Approved: Sep 12, 1985,
- Started: 1991,
- Completed: Jul 8, 1996
CPLEAR Collaboration
Measures time-dependent K0 - Kbar0 decay rate asymmetries for nonleptonic and semileptonic decays. They are sensitive to CP and T violation in different and complementary ways, and also provide sensitive tests of CPT. A beam of 10**6 pbar/sec provided by LEAR is brought to rest in a hydrogen gas target, producing K0 and Kbar0 through the reaction pbar p --> K+- pi-+ K0(Kbar0). Decays of the K0 and Kbar0 are recorded under the same operating conditions, inside a magnetic field and using tracking chambers and a gas sampling electromagnetic calorimeter. The strangeness of the neutral kaon is tagged by detecting the sign of accompanying charged kaon identified by Cerenkovs and scintillators. Hardware processors are used to reconstruct and select different decay topologies on-line in less than 25 microseconds. Taking data (July 96).
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