2021 Impact factor 4.991
Particles and Fields
Eur. Phys. J. C 13, 125-132
DOI 10.1007/s100520000255

A 4-neutrino model with a Higgs triplet

W. Grimus, R. Pfeiffer, T. Schwetz

Institute for Theoretical Physics, University of Vienna, Boltzmanngasse 5, 1090 Vienna, Austria

Received: 11 May 1999 / Published online: 3 February 2000 - © Springer-Verlag 2000

We take as a starting point the Gelmini-Roncadelli model enlarged by a term with explicit lepton number violation in the Higgs potential and add a neutrino singlet field that is coupled via a scalar doublet to the usual leptons. This scenario allows us to take into account all three present indications in favor of neutrino oscillations provided by the solar, atmospheric, and LSND neutrino oscillation experiments. Furthermore, it suggests a model which reproduces naturally one of the two 4-neutrino mass spectra favored by the data. In this model, the solar neutrino problem is solved by large mixing MSW $\nu_e\to\nu_\tau$ transitions, and the atmospheric neutrino problem by transitions of $\nu_\mu$ into a sterile neutrino.

Copyright Società Italiana di Fisica, Springer-Verlag 2000