Horizontal Symmetry and Masses of Neutrinos

  title={Horizontal Symmetry and Masses of Neutrinos},
  author={Tsutomu T. Yanagida},
A striking and puzzling phenomenon 1s that neutrinos appear nearly massless in contrast to all other leptons and quarks. The left-handed neutrinos may combine with their chiral partners (if they exist) to form Dirac fermions with masses comparable to the usual lepton and quark masses. It has been pointed outu by the present author and independently by Gell-Mann, Ramond and Slansky that this can be avoided if the right-handed neutrinos receive superheavy Maiorana masses. This situation can… CONTINUE READING
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