Measurement of the branching ratio of the decay ${\Xi }^0\to {\Sigma }^{+}{\mu }^{-}{\bar{\nu }}_{\mu }$

J. R. Batley, G. E. Kalmus, C. Lazzeroni +110

From the 2002 data taking with a neutral kaon beam extracted from the CERN-SPS, the NA48/1 experiment observed 97 ${\Xi }^0\to {\Sigma }^{+}{\mu }^{-}{\bar{\nu }}_{\mu }$ candidates with a backgroun…