New Tensor Interactions and the KL-KS Mass Difference

K → ππ, KL-KS mass difference and the Dalitz decays of KL ∗

K → ππ, KL-KS mass difference, KL → γγ and the Dalitz decays of KL are studied systematically by assuming that their amplitude can be described in terms of a sum of short distance and long distance contributions. Dominance of the short distance effect on the KL-KS mass difference will be checked by the Dalitz decays of KL in a way consistent with the K → ππ and KL → γγ decays.

Non-factorizable contributions in nonleptonic weak interactions of K mesons

K → ππ, KL-KS mass difference and KL → γγ(∗) are studied systematically by decomposing their amplitude into a sum of factorizable and nonfactorizable ones. The former is calculated by using the naive factorization while the latter is assumed to be dominated by dynamical contributions of various hadron states. Non-factorizable amplitudes for the K → ππ decays are estimated by using a hard pion a...

Radiative Kaon Decays and the Penguin Contribution to the ∆i = 1/2 Rule

A consistent census of penguins in the ∆I = 1/2 rule is taken from the η0 pole contribution to the radiative KL → γγ, KS → π0γγ and K+ → π+γγ decay modes. We briefly comment on its impact for KL → π0π0γγ, KL → π+π−γ and check its compatibility with the KL−KS mass difference and the CP violating ε′/ε parameter.

KL-KS mass difference and supersymmetric left-right-symmetric theories.

A Measurement of the Kl-ks Mass Difference from the Charge Asymmetry in Semi-leptonic Kaon Decays

Introduction. The experiment reported in this paper is part of an extensive study aiming principally at a more precise determination of #+_ , the phase of q+_ , the parameter describing CP-violation in K” + 7~+trdecays. New values of K” + n+ndecay parameters have been reported previously [ 1 ] . The data on semi-leptonic kaon decays recorded simultaneously and in the same apparatus as the pioni...