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 the K+ to pi+ nu nubar decay using the decay-in-flight technique
G. Lamanna;S. Giudici;M. Sozzi;
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% CLFile in questo prodotto:
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