Discrete Symmetries of the Weak Interaction tested at CPLEAR
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	P. Pavlopoulos (Univ. of Basel and CERN)

Abstract:
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We report the results of the CPLEAR experiment on  CP, T and CPT
symmetries in the neutral kaon system. CPLEAR has experimentally
determined, for the first time, the violation of T invariance by a direct
method using semileptonic decays. The CPT symmetry is tested through the
parameter Re(delta) with a precision of a few 10-4 and Im(delta), from the
Bell-Steinberger relation, with a precision of few 10-5. This allows the
mass and width equalities between the K0 and K0-bar to be tested down to
the level of 10-(18) GeV.