An extension of a model of neutrino masses to the quark sector provides an interesting link between these two sectors. A parameter which is important to describe neutrino oscillations and masses is found to be a crucial one appearing in various "penguin" operators, in particular the so-called Z penguin. This parameter is severely constrained by the rare decay process K{sub}L →μ{sup}(+)μ{sup}-.This in turn has interesting implications on the masses of the neutrinos and the masses of the vector-like particles which appear in our model.
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