New and improved quark-lepton symmetric models
Abstract
We show how the use of a see-saw mechanism based on a 3 × 3 neutrino mass matrix texture can considerably simplify Higgs sectors for quark-lepton symmetric models (and for Standard Model extensions generally). The main theory we discuss also incorporates a previously considered scenario whereby the charged lepton of a particular generation is necessarily less massive than the corresponding charge +2/3 quark, provided intergenerational mixing is small.
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