First observation and study of the $K^{\pm }\to {\pi }^0{\pi }^0{\mu }^{\pm }\nu$ decay

2 Collaboration, J. R. Batley, G. Kalmus +121

The NA48/2 experiment at CERN reports the first observation of the $K^{\pm }\to {\pi }^0{\pi }^0{\mu }^{\pm }\nu$ decay based on a sample of 2437 candidates with 15% background contam…