Search for K^+K + decays to a muon and invisible particles
(2021) Physics Letters. Section B: Nuclear, Elementary Particle and High-Energy Physics — Vol. 816, p. 136259 (2021)
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- Abstract
- The NA62 experiment at CERN reports searches for K + → μ+N and K + → μ+ν X 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+ννν¯ branching fraction.
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Cortina Gil, E., Kleimenova, A., Lurkin, N., & et al. (2021). Search for K^+K + decays to a muon and invisible particles. Physics Letters. Section B: Nuclear, Elementary Particle and High-Energy Physics, 816, 136259. https://doi.org/10.1016/j.physletb.2021.136259 (Original work published 2021)