Search for K+ decays to a muon and invisible particles

NA62 Collaboration

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Abstract

The NA62 experiment at CERN reports searches for K+ → μ+N and K+ → μ+νX decays, where N and X are massive invisible particles, using the 2016–2018 data set. The N particle is assumed to be a heavy neutral lepton, and the results are expressed as upper limits of O(10−8) of the neutrino mixing parameter |Uμ4|2 for N masses in the range 200–384 MeV/c2 and lifetime exceeding 50 ns. The X particle is considered a scalar or vector hidden sector mediator decaying to an invisible final state, and upper limits of the decay branching fraction for X masses in the range 10–370 MeV/c2 are reported for the first time, ranging from O(10−5) to O(10−7). An improved upper limit of 1.0 × 10−6 is established at 90% CL on the K+ → μ+ννν̅ branching fraction.
Original languageEnglish
Article number136259
Number of pages10
JournalPhysics Letters B
Volume816
Early online date30 Mar 2021
DOIs
Publication statusPublished - 10 May 2021

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