Measurement of the Two-Photon Decay of theKL0Meson

Abstract

A measurement of the rate $\ensuremath{\Gamma}({K}_{L}^{0}\ensuremath{\rightarrow}2\ensuremath{\gamma})$ has been made relative to the rates $\ensuremath{\Gamma}({K}_{L}^{0}\ensuremath{\rightarrow}3{\ensuremath{\pi}}^{0})$, $\ensuremath{\Gamma}({K}_{L}^{0}\ensuremath{\rightarrow}{\ensuremath{\pi}}^{\ifmmode\pm\else\textpm\fi{}}{\ensuremath{\mu}}^{\ensuremath{\mp}}{\ensuremath{\nu}}_{\ensuremath{\mu}})$, and $\ensuremath{\Gamma}({K}_{L}^{0}\ensuremath{\rightarrow}{\ensuremath{\pi}}^{\ifmmode\pm\else\textpm\fi{}}{e}^{\ensuremath{\mp}}{\ensuremath{\nu}}_{e})$ in a spark-chamber scintillation-counter experiment. Using published branching ratios of the three-body decays relative to the rate $\ensuremath{\Gamma}({K}_{L}^{0}\ensuremath{\rightarrow}\mathrm{all})$, the branching ratio $\frac{\ensuremath{\Gamma}({K}_{L}^{0}\ensuremath{\rightarrow}2\ensuremath{\gamma})}{\ensuremath{\Gamma}({K}_{L}^{0}\ensuremath{\rightarrow}\mathrm{all})}$ has been found to be (4.5 \ifmmode\pm\else\textpm\fi{} 1.0) \ifmmode\times\else\texttimes\fi{} ${10}^{\ensuremath{-}4}$, based on 23 valid decays, which were separated from a small background.

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