Phenomenology of neutral heavy leptons
Pat Kalyniak, Ivan Melo
Abstract
We continue our previous work on the flavour-conserving leptonic decays of the Z boson with neutral heavy leptons (NHL's) in the loops by considering box, vertex, and self-energy diagrams for the muon decay. By inclusion of these loops (they contribute to the input parameter MW) we can probe the full parameter space spanned by the so-called flavour-conserving mixing parameters ee(mix), μμ(mix), ττ(mix) in a superstring-inspired model of neutrino mass. We compare the results of our analysis with the existing work in this field and conclude that flavour-conserving decays have certain advantages over traditionally considered flavour-violating ones.
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