Neutrino Mass Matrix Running for Non-Degenerate See-Saw Scales

Details Neutrino Mass Matrix Running for Non-Degenerate See-Saw Scales Neutrino Mass Matrix Running for Non-Degenerate See-Saw Scales

2002-03-25

arxiv.org/abs/hep-ph/0203233v1

Phys.Lett. B538 (2002) 87-95

Physics

High Energy Physics

High Energy Physics - Phenomenology

12 pages, 9 figures

Scientific paper

We consider the running of the neutrino mass matrix in the Standard Model and the Minimal Supersymmetric Standard Model, extended by heavy singlet Majorana neutrinos. Unlike previous studies, we do not assume that all of the heavy mass eigenvalues are degenerate. This leads to various effective theories when the heavy degrees of freedom are integrated out successively. We calculate the Renormalization Group Equations that govern the evolution of the neutrino mass matrix in these effective theories. We show that an appropriate treatment of the singlet mass scales can yield a substantially different result compared to integrating out the singlets at a common intermediate scale.

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