Normal vs. Inverted Hierarchy in Type I Seesaw Models
Abstract
We demonstrate that, for every grand unified model based on a conventional type I seesaw mechanism leading to a normal light neutrino mass hierarchy, one can easily generate a corresponding model with an inverted hierarchy which yields the same neutrino oscillation parameters. However, the latter type model has several unattractive instabilities which will disfavor any grand unified type I seesaw model, if an inverted neutrino mass hierarchy is observed experimentally. This should be contrasted with the softly-broken flavor symmetry models which are eliminated, if the data favors a normal mass hierarchy.
Cite
@article{arxiv.hep-ph/0407155,
title = {Normal vs. Inverted Hierarchy in Type I Seesaw Models},
author = {Carl H. Albright},
journal= {arXiv preprint arXiv:hep-ph/0407155},
year = {2009}
}
Comments
10 pages including 1 figure; improved version with additional illustration of results for whole class of models with charged lepton mass matrices diagonal in flavor space; accepted for publication in Physics Letters B