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
Abstract
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
transitions, and the atmospheric neutrino
problem by transitions of 
into a sterile neutrino.
Copyright Società Italiana di Fisica, Springer-Verlag 2000
