Proton Stability and Small Neutrino Mass in String Inspired E_6 Model : Particles and fields

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We propose a new possibility to simultaneously realize sufficient proton stability and an interesting structure of the neutrino mass matrix in superstring inspired E_6models. In this model the leptons and Higgs fields are assigned to the fundamental representation 27 in a different way among generations. Two pairs of Higgs doublets are naturally kept to be light among three generation ones by imposing certain discrete symmetries, although all extra color triplets become sufficiently heavy.Under these symmetries, μ-terms which induce appropriate vacuum expectation values are prepared and the dangerous FCNC is avoidable. Some phenomena related to this model, in particular, the structure of the neutrino mass matrix are also discussed.
理論物理学刊行会の論文
1996-09-25