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Reconstructing Seesaws

Abstract : 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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Contributor : Dominique Girod <>
Submitted on : Monday, November 7, 2011 - 1:41:12 PM
Last modification on : Tuesday, April 20, 2021 - 4:20:02 PM

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Sacha Davidson, M. Elmer. Reconstructing Seesaws. European Physical Journal C: Particles and Fields, Springer Verlag (Germany), 2011, 71, pp.1804. ⟨10.1140/epjc/s10052-011-1804-1⟩. ⟨in2p3-00638812⟩



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