16,924 research outputs found
Minimal Models for Axion and Neutrino
The PQ mechanism resolving the strong CP problem and the seesaw mechanism
explaining the smallness of neutrino masses may be related in a way that the PQ
symmetry breaking scale and the seesaw scale arise from a common origin.
Depending on how the PQ symmetry and the seesaw mechanism are realized, one has
different predictions on the color and electromagnetic anomalies which could be
tested in the future axion dark matter search experiments. Motivated by this,
we construct various PQ seesaw models which are minimally extended from the
(non-) supersymmetric Standard Model and thus set up different benchmark points
on the axion-photon-photon coupling in comparison with the standard KSVZ and
DFSZ models.Comment: 12 pages and 2 figures, references added, matched with the published
version in PL
An extension of tribimaximal lepton mixing
Harrison, Perkins and Scott have proposed simple charged lepton and neutrino
mass matrices that lead to the tribimaximal mixing . We consider
in this work an extension of the mass matrices so that the leptonic mixing
matrix becomes , where
is a unitary matrix needed to diagonalize the charged lepton mass matrix and
measures the deviation of the neutrino mixing matrix from the bimaximal
form. Hence, corrections to arise from both charged lepton and
neutrino sectors. Following our previous work to assume a Qin-Ma-like
parametrization for the charged lepton mixing matrix in
which the {\it CP}-odd phase is approximately maximal, we study the
phenomenological implications in two different scenarios: and . We find that the latter is more
preferable, though both scenarios are consistent with the data within
ranges. The predicted reactor neutrino mixing angle in both
scenarios is consistent with the recent T2K and MINOS data. The leptonic {\it
CP} violation characterized by the Jarlskog invariant is generally
of order .Comment: 20 pages and 8 figures, Accepted in Phys.Review
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