155 citations · 912 across the 34 of their papers we have counts for
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hep-ex2023
First observation and study of the decay
2 Collaboration, J. R. Batley, G. Kalmus +121
The NA48/2 experiment at CERN reports the first observation of the decay based on a sample of 2437 candidates with 15% background contam…
hep-ex2023★ 5 cited
A study of the decay
The NA62 Collaboration
A sample of candidates with less than 1% background was collected by the NA62 experiment at the CERN SPS in 2017-2018. Branching fraction mea…