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First search for K + →π + νν¯ using the decay-in-flight technique

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  • The NA62 Collaboration
<mark>Journal publication date</mark>10/04/2019
<mark>Journal</mark>Physics Letters B
Number of pages11
Pages (from-to)156-166
Publication StatusPublished
Early online date23/02/19
<mark>Original language</mark>English


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.