Recent results of the CPLEAR experiment

Abstract The CPLEAR experiment at CERN has been designed to measure CP and T violating effects in the neutral kaon system by observing particle-antiparticle asymmetries. The motivation and the physics program of CPLEAR is presented and first analyses of the K 0 , k 0 to π + π − , π 0 π 0 and π + π − π 0 decays are discussed. Special emphasis is given to the recent results of the measurement of the CP violating parameters ϑ +− and η +− based on first data taken in 1990/1991.