Proton Stability and Small Neutrino Mass in String Inspired $E_6$ Models

Details Proton Stability and Small Neutrino Mass in String Inspired $E_6$ Models Proton Stability and Small Neutrino Mass in String Inspired $E_6$ Models

1996-04-06

arxiv.org/abs/hep-ph/9604257v3

Prog.Theor.Phys.96:611-622,1996

Physics

High Energy Physics

High Energy Physics - Phenomenology

20 pages, latex, a version published in Prog. Theor. Phys., discussions related to neutrino masses are changed

Scientific paper

10.1143/PTP.96.611

We propose a new possibility to realize simultaneously the sufficient proton stability and the interesting structure of neutrino mass matrix in superstring inspired $E_6$ models. In this model the leptons and Higgs fields are assigned to a fundamental representation {\bf 27} in the different way among generations. Two pairs of Higgs doublets naturally remain light from three generation ones by imposing certain discrete symmetries, although all extra color triplets become sufficiently heavy. Under these symmetries suitable $\mu$-terms to bring appropriate vacuum expectation values are prepared and the dangerous FCNC is avoidable. Some related phenomena to this model, especially, the structure of neutrino mass matrix are also discussed.

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