The NA62 experiment at the CERN SPS reports the first search for K+→π+νν¯ using the decay-in-flight technique, based on a sample of 1.21×10^11 K+ decays collected in 2016. The single event sensitivity is 3.15×10^−10, corresponding to 0.267 Standard Model events. One signal candidate is observed while the expected background is 0.152 events. This leads to an upper limit of 14×10^−10 on the K+→π+νν¯ branching ratio at 95% CL.
First search for K+→π+νν¯ using the decay-in-flight technique
Arcidiacono R.;Boretto M.;Menichetti E.;Migliore E.;Soldi D.;
2019-01-01
Abstract
The NA62 experiment at the CERN SPS reports the first search for K+→π+νν¯ using the decay-in-flight technique, based on a sample of 1.21×10^11 K+ decays collected in 2016. The single event sensitivity is 3.15×10^−10, corresponding to 0.267 Standard Model events. One signal candidate is observed while the expected background is 0.152 events. This leads to an upper limit of 14×10^−10 on the K+→π+νν¯ branching ratio at 95% CL.
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