Maximal atmospheric neutrino mixing and the small ratio of muon to tau mass

Details Maximal atmospheric neutrino mixing and the small ratio of muon to tau mass Maximal atmospheric neutrino mixing and the small ratio of muon to tau mass

2003-09-04

arxiv.org/abs/hep-ph/0309050v2

J.Phys.G30:73-82,2004

Physics

High Energy Physics

High Energy Physics - Phenomenology

10 pages, plain LaTeX, no figures, minor changes, final version for J. Phys. G

Scientific paper

10.1088/0954-3899/30/2/007

We discuss the problem of the small ratio of muon mass to tau mass in a class of seesaw models where maximal atmospheric neutrino mixing is enforced through a $\mu$--$\tau$ interchange symmetry. We introduce into those models an additional symmetry $T$ such that $m_\mu = 0$ in the case of exact $T$ invariance. The symmetry $T$ may be softly broken in the Higgs potential, and one thus achieves $m_\mu \ll m_\tau$ in a technically natural way. We speculate on a wider applicability of this mechanism.

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