Abstract
The recent observation in neutrino experiments of dimuonic events with the same charge of the muons is interpreted as an indication that single charged and neutral heavy leptons are produced in these experiments. A simple phenomenological model based on quark-lepton analogy makes it possible to explain the strong suppression of trimuonic events compared with the dimuonic events of the same sign, the amount of the suppression depending only on the mass of the neutral muon. A natural possibility is discussed for including the block of the muon family of leptons (2) introduced here into the minimal vectorlike model of Fritzsch, Gell-Mann, and Minkowski with six quarks; the list of good properties of this model is then augmented by an effective mechanism of generation of dimuonic events with the same sign of the muon charge and trimuonic events.
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