paper

A discrete symmetry group for maximal atmospheric neutrino mixing

arXiv:hep-ph/0305046 · doi:10.1016/j.physletb.2003.08.032

Abstract

We propose a discrete non-abelian symmetry group which enforces maximal atmospheric neutrino mixing, while and the solar mixing angle remains undetermined; without finetuning, will be large but non-maximal. Our extension of the Standard Model has three right-handed neutrino singlets and implements the seesaw mechanism. Furthermore, we have an enlarged scalar sector with three Higgs doublets and two scalar gauge singlets; the latter have masses and vacuum expectation values of the order of the seesaw scale. Lepton mixing stems exclusively from the Majorana mass matrix, where non-diagonal elements are generated by the vacuum expectation values of the scalar singlets. The model predicts a neutrino mass spectrum with and the effective Majorana mass of neutrinoless decay is equal to .

9 pages, no figures, plain LaTeX; new section added and misprints corrected, version to be published in Phys. Lett. B

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