Experimental Study of the Decay $K_{L} \to π^{0} π^{0}$ and Other Rare Decay Modes

Publisher Website

25 December 1969

journal article
research article
Published by American Physical Society (APS) in Physical Review B

Vol. 188 (5) , 2033-2059
https://doi.org/10.1103/physrev.188.2033

Abstract

We have measured the branching ratio

\frac{Γ (K_{L} \to 2 π^{0})}{Γ (K_{L} \to 3 π^{0})}

to be (4.6±1.1)×

10^{- 3}

. This leads to

\frac{Γ (K_{L} \to 2 π^{0})}{Γ (K_{L} \to all)} = (0.97 \pm 0.23) \times 10^{- 3}

and a

CP

-violation parameter

| η_{00} | = (2.2 \pm 0.3) \times 10^{- 3}

. We also report

\frac{Γ (K_{L} \to γ γ)}{Γ (K_{L} \to all)} = (4.7 \pm 0.6) \times 10^{- 4}

,

\frac{Γ (K_{S} \to γ γ)}{Γ (K_{S} \to all)} < 0.02

with 90% confidence and

\frac{Γ (K_{L} \to π^{0} γ γ)}{Γ (K_{L} \to all)} < 2.3 \times 10^{- 4}

with 90% confidence.

Keywords

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