Regular Article - Theoretical Physics
IPNL, Université de Lyon, Université Lyon 1, CNRS/IN2P3, 4 rue E. Fermi, 69622, Villeurbanne cedex, France
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Revised: 12 October 2011
Published online: 18 November 2011
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 ℓ α →ℓ β γ 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.
© Springer-Verlag / Società Italiana di Fisica, 2011