Neutrino Mass and $\mu \to e+\gamma$ from a Mini-Seesaw

Abstract

The recently proposed "mini-seesaw mechanism" combines naturally suppressed Dirac and Majorana masses to achieve light Standard Model neutrinos via a low-scale seesaw. A key feature of this approach is the presence of multiple light (order GeV) sterile-neutrinos that mix with the Standard Model. In this work we study the bounds on these light sterile-neutrinos from processes like μ---> e + γ, invisible Z-decays, and neutrinoless double beta-decay. We show that viable parameter space exists and that, interestingly, key observables can lie just below current experimental sensitivities. In particular, a motivated region of parameter space predicts a value of BR(μ---> e + γ) within the range to be probed by MEG.

1+26 pages, 7 figures. v2 JHEP version (typo's fixed, minor change to presentation, results unchanged)

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• A Dynamical Framework for KeV Dirac Neutrino Warm Dark Matter
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• Gravity on a Little Warped Space
• Regarding the Radion in Randall-Sundrum Models with Brane Curvature