Neutral decays ofη′(958)

Tau Decays with Neutral Kaons

The branching ratio of the τ lepton to a neutral kaon meson is measured from a sample of approximately 200,000 τ decays recorded by the OPAL detector at centre-ofmass energies near the Z resonance. The measurement is based on two samples which identify one-prong τ decays with KL and K 0 S mesons. The combined branching ratios are measured to be B(τ− → πKντ ) = (9.33 ± 0.68 ± 0.49)× 10, B(τ− → π...

Charm Radiative Decays with Neutral Mesons

Direct CP Violation in Neutral Kaon Decays

Abstract. The final result is presented of the NA48 experiment, performed at the CERN SPS neutral kaon beams, on the direct CP violation parameter Re(ε′/ε), as measured from the decay rates of neutral kaons into two pions. The data collected in years 1997-2001 yield the evidence for the direct CP violation with Re(ε′/ε) = (14.7± 2.2) × 10. Description of experimental method and systematics, com...

CPT invariance with correlated neutral B decays

We study breakdown of CP T symmetry which can occur in the decay process B ¯ B → l ± X ∓ f with f being a CP eigenstate. In this process, the standard model expectations for time ordered semi-leptonic and hadronic events, i.e. which of the two decays takes place first, can be altered in the case that there is a violation of the CP T symmetry. To illustrate this possibility, we identify and stud...

CP Violation in Neutral Kaon Decays

A brief review of the theoretical status of CP violation in decays of neutral kaons is presented. We focus on three important topics: e, E ' / E and IC, + TOVC. Invited Talk presented at the Symposium on Flavor-Changing Neutral Currents, Santa Monica, California, February 19-21, 1997