Search for heavy neutral lepton production in K^+K + decays to positrons
(2020) Physics Letters. Section B: Nuclear, Elementary Particle and High-Energy Physics — Vol. 807, n° 807, p. 135599 (2020)
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- et. al.
- Abstract
- A search for heavy neutral lepton ( N ) production in K+→e+N decays using the data sample collected by the NA62 experiment at CERN in 2017–2018 is reported. Upper limits of the extended neutrino mixing matrix element |Ue4|2 are established at the level of 10−9 over most of the accessible heavy neutral lepton mass range 144–462 MeV/ c2 , with the assumption that the lifetime exceeds 50 ns. These limits improve significantly upon those of previous production and decay searches. The |Ue4|2 range favoured by Big Bang Nucleosynthesis is excluded up to a mass of about 340 MeV/ c2 .
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Citations
Cortina Gil, E., Kleimenova, A., Lurkin, N., & et al. (2020). Search for heavy neutral lepton production in K^+K + decays to positrons. Physics Letters. Section B: Nuclear, Elementary Particle and High-Energy Physics, 807(807), 135599. https://doi.org/10.1016/j.physletb.2020.135599 (Original work published 2020)