Enhanced Electromagnetic Transition Dipole Moments and Radiative Decays of Massive Neutrinos due to the Seesaw-induced Non-unitary Effects
arXiv:1201.2543 · doi:10.1016/j.physletb.2012.07.043
Abstract
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 transition dipole moments of three light Majorana 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 important observation reveals an intrinsic and presumably significant correlation between the electromagnetic properties of massive neutrinos and the origin of their small masses.
10 pages, 4 figures, more discussions and references added, accepted for publication in PLB
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Cited by in corpus (7)
- Prospects for exploring New Physics in Coherent Elastic Neutrino-Nucleus Scattering
- Constraining Neutrino Lifetimes and Magnetic Moments via Solar Neutrinos in the Large Xenon Detectors
- CP violation in neutral lepton transition dipole moment
- CP violation and circular polarisation in neutrino radiative decay
- Theoretical Overview on the Flavor Issues of Massive Neutrinos
- Probing unitarity violation of lepton flavor mixing matrix with reactor antineutrinos at JUNO and TAO
- Status and perspectives of neutrino magnetic moments