The NuTeV Anomaly, Lepton Universality, and Non-Universal Neutrino-Gauge Couplings

Details The NuTeV Anomaly, Lepton Universality, and Non-Universal Neutrino-Gauge Couplings The NuTeV Anomaly, Lepton Universality, and Non-Universal Neutrino-Gauge Couplings

2004-03-31

arxiv.org/abs/hep-ph/0403306v2

Phys.Rev. D70 (2004) 113004

Physics

High Energy Physics

High Energy Physics - Phenomenology

REVTeX4, 25 pages, 10 postscript figures. Updated fits using the new top mass. Updated figures. Extended discussion on the sta

Scientific paper

10.1103/PhysRevD.70.113004

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.

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