Phenomenology of the triplet seesaw mechanism with gauge and Yukawa mediation of SUSY breaking

We thoroughly discuss a new supersymmetric grand unified scenario of the triplet seesaw mechanism where the exchange of heavy SU(2) W triplet states generates both neutrino masses and soft supersymmetry breaking terms. This framework, recently proposed by us in a previous work, is highly predictive since it contains only three free parameters connecting low-energy neutrino parameters, lepton and quark flavour violation, sparticle and Higgs boson spectra and electroweak symmetry breakdown. These three parameters are the triplet mass M-T, the effective supersymmetry breaking scale B-T and a coupling constant L We perform a complete analysis of the parameter space taking into account the present experimental constraints and considering different types of neutrino spectrum. A special emphasis is given to the particular features of the sparticle and Higgs spectra and to the model independent predictions obtained for the processes mu -> eX, mu -> e conversion in nuclei, tau -> eY and tau -> mu Y (X = y, ee, Y = y, ee, mu mu). In the appendices, we present some technical aspects relevant for our analysis. (c) 2006 Elsevier B.V. All rights reserved.