出版社：SISSA, Scuola Internazionale Superiore di Studi Avanzati
摘要：We examine neutrino oscillations in a two Higgs doublet model (2HDM) in which the second
doublet couples only to the third generation right-handed up-fermions, i.e., to tR and N3 which
is the heaviest right-handed Majorana neutrino. The inherently large tanb of this model can
naturally account for the large top-quark mass and, based on a quark-lepton similarity ansatz,
when embedded into a seesaw mechanism it can also account for the observed neutrino masses
and mixing angles giving a very small q13: 0:960 <
q13
<
1:360 at 99% CL, and a very restrictive
prediction for the atmospheric mixing angle: 42:90 <
qatm
<45:
20 at 99% CL. The large value of
tanb also sets the mass scale of the heaviest right-handed Majorana neutrino N3 and triggers
successful leptogenesis.
