#lepton  an elementary particle that participates in weak interactions; has a baryon number of 0
  supertype:  #elementary_particle  #fermion
  subtype:  #electron__negatron  an elementary particle with negative charge
     subtype:  #delta_ray__deltaray  an electron ejected from matter by ionizing radiation
     subtype:  #free_electron  electron that is not attached to an atom or ion or molecule but is free to move under the influence of an electric field
     subtype:  #photoelectron  an electron that is emitted from an atom or molecule by an incident photon
     subtype:  #valence_electron__valenceelectron  an electron in the outer shell of an atom which can combine with other atoms to form molecules
  subtype:  #negative_muon__muon__mu-meson  an elementary particle with a negative charge and a half-life of 2 microsecond; decays to electron and neutrino and antineutrino
  subtype:  #neutrino  an elementary particle with zero charge and zero mass
  subtype:  #tauon__tau-minus_particle__tauminusparticle  a lepton of very great mass

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