Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2004-03-16
Nucl.Phys.B690:279-301,2004
Physics
High Energy Physics
High Energy Physics - Phenomenology
26 pages, 22 figures, references added
Scientific paper
10.1016/j.nuclphysb.2004.05.001
We present predictions for flavour-violating charged-lepton decays induced by the seesaw mechanism implemented within the constrained minimal supersymmetric standard model (CMSSM) with universal input soft supersymmetry breaking terms. We assume that one heavy singlet neutrino almost decouples from the see-saw mechanism, as suggested by the pattern of light neutrino masses and mixing angles. This is suggested independently by sneutrino inflation with a low reheating temperature, T(RH)<10^7 GeV, so as to avoid overproducing gravitinos. This requirement further fixes the mass of the weakly-coupled sneutrino, whose decays may lead to leptogenesis. We find that BR(mu->e gamma)>10^(-13) but BR(tau->mu gamma)<10^(-9) in the bulk of the acceptable parameter space, apart from a few isolated points. The ratio BR(mu->e gamma)/BR(tau->mu gamma) depends on only one complex parameter, and is particularly interesting to compare with experiment.
Chankowski Piotr H.
Ellis John
Pokorski Stefan
Raidal Martti
Turzynski Krzysztof
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