Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2006-09-29
JHEP 0612:052,2006
Physics
High Energy Physics
High Energy Physics - Phenomenology
14 pages, 16 figures
Scientific paper
10.1088/1126-6708/2006/12/052
The smallness of the observed neutrino masses might have a radiative origin. Here we revisit a specific two-loop model of neutrino mass, independently proposed by Babu and Zee. We point out that current constraints from neutrino data can be used to derive strict lower limits on the branching ratio of flavour changing charged lepton decays, such as $\mu \to e \gamma$. Non-observation of Br($\mu \to e \gamma$) at the level of $10^{-13}$ would rule out singly charged scalar masses smaller than 590 GeV (5.04 TeV) in case of normal (inverse) neutrino mass hierarchy. Conversely, decay branching ratios of the non-standard scalars of the model can be fixed by the measured neutrino angles (and mass scale). Thus, if the scalars of the model are light enough to be produced at the LHC or ILC, measuring their decay properties would serve as a direct test of the model as the origin of neutrino masses.
Hirsch Manfred
Sierra Diego Aristizabal
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