Supersymmetric type-III seesaw: lepton flavour violation and LHC phenomenology

Abstract

We study a supersymmetric version of the seesaw mechanism type-III considering two variants of the model: a minimal version for explaining neutrino data with only two copies of 24-plet superfields and a model with three generations of 24-plets. The latter predicts in general rates for $\mu \to e\gamma$ inconsistent with experimental data. However, this bound can be evaded if certain special conditions within the neutrino sector are fulfilled. In case of two 24-plets lepton flavour violation constraints can be satisfied much easier. After specifying the corresponding regions in the CMSSM parameter space we show that under favorable conditions one can test the corresponding flavour structures in the leptonic sector at the LHC. For this we perform Monte Carlo studies for the signals taking also into account the SUSY background. We find that it is only of minor importance for the scenarios studied here.

arXiv comment21 pages, 10 figures; v2: matches version accepted for publication by PRD (added references, extended discussion of Higgs mass, analytical approximations for flavor observables, remark on gauge unification)

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