Zhi-zhong Xing, Ye-Ling Zhou
In a simple extension of the standard electroweak theory where the phenomenon
of lepton flavor mixing is described by a 3x3 unitary matrix V, the electric
and magnetic dipole moments of three active neutrinos are suppressed not only
by their tiny masses but also by the Glashow-Iliopoulos-Maiani (GIM) mechanism.
We show that it is possible to lift the GIM suppression if the canonical seesaw
mechanism of neutrino mass generation, which allows V to be slightly
non-unitary, is taken into account. In view of current experimental constraints
on the non-unitarity of V, we find that the effective electromagnetic dipole
moments of three neutrinos and the rates of their radiative decays can be
maximally enhanced by a factor of O(10^2) and a factor of O(10^4),
respectively. This nontrivial observation reveals an intrinsic and presumably
significant correlation between the electromagnetic properties of massive
neutrinos and the origin of their small masses.
View original:
http://arxiv.org/abs/1201.2543
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