4 research outputs found
The NuTeV Anomaly, Lepton Universality, and Non-Universal Neutrino-Gauge Couplings
In previous studies we found that models with flavor-universal suppression of
the neutrino-gauge couplings are compatible with NuTeV and Z-pole data. In this
paper we expand our analysis to obtain constraints on flavor-dependent coupling
suppression by including lepton universality data from W, tau, pi and K decays
in fits to model parameters. We find that the data are consistent with a
variety of patterns of coupling suppression. In particular, in scenarios in
which the suppression arises from the mixing of light neutrinos with heavy
gauge singlet states (neutrissimos), we find patterns of flavor-dependent
coupling suppression which are also consistent with constraints from mu -> e
gamma.Comment: REVTeX4, 25 pages, 10 postscript figures. Updated fits using the new
top mass. Updated figures. Extended discussion on the status of the
determination of B(tau->pi nu