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

Abstract

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 $K_L^0{K}_S^0$ pairs, $75\pm 13$ events of the $K_S^0\to \pi e\nu$ decay were selected. The corresponding branching ratio is $B(K_S^0\to \pi e\nu )=(7.2\pm 1.4)\times 10^{-4}$. 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 $\Delta S=\Delta Q$ .

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

Cited by in corpus (1)

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