Limit on the Branching Ratio of $K_{L} \to π^{0} ν \bar{ν}$

Publisher Website

13 June 1994

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

Vol. 72 (24) , 3758-3761
https://doi.org/10.1103/physrevlett.72.3758

Abstract

We report on a search for the decay

K_{L} \to π^{0} ν \bar{ν}

by the Fermilab E799 Collaboration. The partial width for this mode is related in a calculable way to the

CP

violation parameters of the standard model. In particular, the decay

K_{L} \to π^{0} ν \bar{ν}

is predicted to proceed almost entirely via a direct

CP

violating amplitude. No events were observed, allowing us to set an upper limit on the branching ratio of

B (K_{L} \to π^{0} ν \bar{ν}) < 5.8 \times 10^{- 5}

at the 90% confidence level.

Keywords

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