367 research outputs found
Are the small neutrino oscillation parameters all related?
Neutrino oscillations reveal several small parameters, namely, ,
the solar mass splitting {\em vis-\`{a}-vis} the atmospheric one, and the
deviation of from maximal mixing. Can these small quantities all
be traced to a single source and, if so, how could that be tested? Here a
see-saw model for neutrino masses is presented wherein a dominant term
generates the atmospheric mass splitting with maximal mixing in this sector,
keeping and zero solar splitting. A Type-I see-saw
perturbative contribution results in non-zero values of , , , as well as allows to deviate from
in consistency with the data while interrelating them all. CP-violation
is a natural consequence and is large () for
inverted mass ordering. The model will be tested as precision on the neutrino
parameters is sharpened.Comment: v1: 8 pages, 2 Figures, v2: Published version, Journal title
different, minor typographical changes, presentation improved, references
added and updated. 9 pages, 3 Figures, Fig. 2 split into Fig. 2 and Fig. 3
for clarit
Three-Higgs-doublet model under A4 symmetry implies alignment
A model with three scalar doublets can be conveniently accommodated within an
A4 symmetric framework. The A4 symmetry permits only a restricted form for the
scalar potential. We show that for the global minima of this potential
alignment follows as a natural consequence. We also verify that in every case
positivity and unitarity constraints are satisfactorily met.Comment: 17 pages, v2: References added, some changes in text, to appear in
JHE
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