#meson__mesotron  an elementary particle responsible for the forces in the atomic nucleus; a hadron with a baryon number of 0
  supertype:  hadron  boson
  subtype:  b-meson__bmeson  exceedingly short-lived meson
  subtype:  J_particle__psi_particle__psiparticle  a neutral meson with a large mass
  subtype:  kaon__kappa-meson__kappameson__k-meson__kmeson__K_particle  an unstable meson produced as the result of a high-energy particle collision
  subtype:  pion__pi-meson  a meson produced as the result of high-energy particle collision

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