Neutrino masses in the effective rank-5 subgroups of E(6): Supersymmetric case

We present a complete analysis of the neutral fermion sector of supersymmetric E_6-inspired low energy models containing an extra SU(2), concentrating on the Alternate Left-Right and Inert models. We show that the R-parity conserving scenario always exhibits a large Dirac mass for \nu_L with maximal mixing with an isosinglet neutrino, and that R-parity violating scenarios do not change the picture other than allowing further mixing with another isosinglet. In order to recover Standard Model phenomenology, additional assumptions in the form of discrete symmetries and/or new interactions are needed. We introduce and investigate Discrete Symmetry method and Higher Dimensional Operators as mechanisms for solving the neutrino mass and mixing problems in these models.

Note:

27 pages, 2 figures: typos correted, version to be published in Physical Review D Report-no: CUMQ/HEP 133, WM-05-107

14.60.Pq
12.60.Fr
12.60.Cn
14.60.St
BEYOND THE STANDARD MODEL
SUSY
NEUTRINOS
GUT
neutrino: mass
supersymmetry

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