New limit on the $K_L^0\to {\pi }^0\nu \bar{\nu }$ decay rate

Abstract

The first dedicated experiment for the rare kaon decay $K_L^0\to {\pi }^0\nu \bar{\nu }$ has been performed by the E391a collaboration at the KEK 12-GeV proton synchrotron. A new upper limit of $2.1\times 10^{-7}$ at the 90% confidence level was set for the branching ratio of the decay $K_L^0\to {\pi }^0\nu \bar{\nu }$ using about 10% of the data collected during the first period of data taking.

5 pages, 4 figures, the title was changed

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