Reconstructing Seesaws

Details Reconstructing Seesaws Reconstructing Seesaws

2011-08-02

arxiv.org/abs/1108.0548v2

Physics

High Energy Physics

High Energy Physics - Phenomenology

14 pages

Scientific paper

We explore some aspects of "reconstructing" the heavy singlet sector of supersymmetric type I seesaw models, for two, three or four singlets. We work in the limit where one light neutrino is massless. In an ideal world, where selected coefficients of the TeV-scale effective Lagrangian could be measured with arbitrary accuracy, the two-singlet case can be reconstructed, two three or more singlets can be differentiated, and an inverse seesaw with four singlets can be reconstructed. In a more realistic world, we estimate $\ell_\a \to \ell_\b \gamma$ expectations with a "Minimal-Flavour-Violation-like" ansatz, which gives a relation between ratios of the three branching ratios. The two singlet model predicts a discrete set of ratios.

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