Observation of $K_S^0$ semileptonic decays with CMD-2 detector

Details Observation of $K_S^0$ semileptonic decays with CMD-2 detector Observation of $K_S^0$ semileptonic decays with CMD-2 detector

1999-05-14

arxiv.org/abs/hep-ex/9905022v1

Phys.Lett.B456:90-94,1999

Physics

High Energy Physics

High Energy Physics - Experiment

7 pages, 6 figures, LaTex2e. Submitted to Phys.Lett.B

Scientific paper

10.1016/S0370-2693(99)00443-8

The decay $K_S^0 \to \pi e \nu$ has been observed by the CMD-2 detector at the e^+e^- collider VEPP-2M at Novosibirsk. Of 6 million produced $K_L^0K_S^0$ pairs, $75 \pm 13$ events of the $K_S^0 \to \pi e \nu$ decay were selected. The corresponding branching ratio is $B(K_S^0 \to \pi e \nu)=(7.2 \pm 1.4)\times10^{-4}$. This result is consistent with the evaluation of $B(K_S^0 \to \pi e \nu)$ from the $K_L^0$ semileptonic rate and $K_S^0$ lifetime assuming $\Delta S=\Delta Q$ .

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