Rare kaon decays

CP violation and K charge radius were measured using KL → π+π−e+e− decays. Specifically, a unique CP-violating decay-plane asymmetry was measured along with the parameters of individual contributions to the decay invariant amplitude: (i) CP-conserving magnetic dipole direct emission form factor, (ii) CPconserving K charge radius transition amplitude and (iii) an upper limit for the CP-violating electric dipole direct emission amplitude. The measurements were obtained from the data sample accumulated by KTeV experiment at Fermilab. KTeV had two major goals: the measurement of direct CP violation parameter Re (ε ′/ε ) and the study of rare kaon decays. The state of the art detector was constructed, commissioned, operated and maintained by an international collaboration of scientists from fourteen institutions. The KL → π+π−e+e− data was accumulated over the 1997 and 1999 running periods. During that time hundreds of billions KL decays took place in the KTeV fiducial decay region. In the analysis of the rare decay mode KL → π+π−e+e− 5241 candidate events were selected from the entire KTeV dataset. This data sample included an estimated background of n = 204 ± 14 events. The data was analyzed using the method of maximum likelihood to obtain parameters of the decay invariant amplitude. Namely, coefficients of the magnetic dipole (M1) direct emission form

http://cds.cern.ch/record/945926/files/cer-002612892.pdf

Measurements of CP Violation and K 0 Charge Radius using KL ! + e + e Decays.

CP violating neutral leptonic currents and KL,So → μμ decays☆

Comments on some four-body KL0-decays

The current status of the two K-decay experiments, which are now underway with the 12-GeV proton synchrotron (PS) at KEK, is reported. One is to detect a rare decay mode KL → π+π−e+e−, and the other to search for the T-violation in the K+ → π0μ+ν decay. Some comments are also given on possible K-decay experiments with a high-intensity 50-GeV PS, which is proposed to build in the near future at KEK.

K physics at KEK with the present 12-GeV and future 50-GeV PS

A general discussion is given of the matrix element for the decays ${K}^{0}\ensuremath{\rightarrow}\ensuremath{\pi}\ensuremath{\pi}{e}^{+}{e}^{\ensuremath{-}}$; then, using the results of the vector-meson-dominance model to predict the $K_{2}^{}{}_{}{}^{0}K_{1}^{}{}_{}{}^{0}$ electromagnetic transition radius, partial conservation of axial-vector current and current algebra to predict the $K_{2}^{}{}_{}{}^{0}\ensuremath{\rightarrow}{\ensuremath{\pi}}^{+}{\ensuremath{\pi}}^{\ensuremath{-}}\ensuremath{\gamma}$ transition rate, and the experimental value of the $\mathrm{CP}$-violating parameter $\ensuremath{\epsilon}$, we find the following branching ratios: $\frac{\ensuremath{\Gamma}(K_{L}^{}{}_{}{}^{0}\ensuremath{\rightarrow}{\ensuremath{\pi}}^{+}{\ensuremath{\pi}}^{\ensuremath{-}}{e}^{+}{e}^{\ensuremath{-}})}{\ensuremath{\Gamma}(K_{L}^{}{}_{}{}^{0}\ensuremath{\rightarrow}\mathrm{all})=1.7\ifmmode\times\else\texttimes\fi{}{10}^{\ensuremath{-}7}}$, $\frac{\ensuremath{\Gamma}(K_{L}^{}{}_{}{}^{0}\ensuremath{\rightarrow}{\ensuremath{\pi}}^{0}{\ensuremath{\pi}}^{0}{e}^{+}{e}^{\ensuremath{-}})}{\ensuremath{\Gamma}(K_{L}^{}{}_{}{}^{0}\ensuremath{\rightarrow}\mathrm{all})=0.2\ifmmode\times\else\texttimes\fi{}{10}^{\ensuremath{-}7}}$, and $\frac{\ensuremath{\Gamma}(K_{S}^{}{}_{}{}^{0}\ensuremath{\rightarrow}{\ensuremath{\pi}}^{+}{\ensuremath{\pi}}^{\ensuremath{-}}{e}^{+}{e}^{\ensuremath{-}})}{\ensuremath{\Gamma}(K_{S}^{}{}_{}{}^{0}\ensuremath{\rightarrow}\mathrm{all})=2.0\ifmmode\times\else\texttimes\fi{}{10}^{\ensuremath{-}5}}$.

CURRENT ALGEBRA, FIELD-CURRENT IDENTITY, THE K$sub 2$$sup 0$K$sub 1$$sup 0$ ELECTROMAGNETIC TRANSITION, AND THE DECAYS K$sup 0$ $Yields$ $pi$$pi$e$sup +$e.

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CURRENT ALGEBRA, FIELD-CURRENT IDENTITY, THE K$sub 2$$sup 0$K$sub 1$$sup 0$ ELECTROMAGNETIC TRANSITION, AND THE DECAYS K$sup 0$ $Yields$ $pi$$pi$e$sup +$e.