Abstract
Muon–pion invariant mass distributions (Mμπ) observed in neutrino interactions and in the decays of the K0L are compatible with the possible existence of a neutral lepton with a mass in the range 0.422 < Mμπ < 0.437 GeV.
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References
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RAMM, C. On the Possible Existence of Heavy Leptons. Nature 227, 1323–1327 (1970). https://doi.org/10.1038/2271323a0
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DOI: https://doi.org/10.1038/2271323a0
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