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197019781986199420021260
Abstract: (Elsevier)
We have considered both theoretical and experimental evidence for the existence of a lepton (analogous to the muon or electron) whose mass is greater than the muon. We find that theory cannot exclude such a particle. Presently available data show that such a lepton must be heavier than the kaon.
  • lepton: mass
  • mass: lepton
  • postulated particle