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Data from the NA31 experiment at CERN have been used to measure the decay K L → π pm e ± νγ (K 0e3γ ). 1384 ± 53 events of this decay type have been observed. The decay rate relative to K 0e3 is found to be T (K 0e3γ , E *γ ≥ 30 MeV, Θ *e-γ ≥ 20°)/Γ (K 0e ...
Data from the NA31 experiment at CERN have been used to measure the decay K S → γγ. From 69 candidate events of the type K 0 → γγ, 52 events can be attributed to K L → γγ and one event is expected from background processes. The ratio of the relative decay widths R = Γ (K S → γγ) L → γγ) is measured to beR = 2.2 ± 1.0(stat.) ± 0.3(syst.) ± 0.2(ext.) where the...
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