Mini-charged neutrinos are viable only for flavor-universal U(1)_X extensions such as U(1)_{B-L} and U(1)_L, and their experimental constraints are model-dependent, with upper bounds ranging from 10^-19 e to 10^-21 e.
Do the SuperKamiokande atmospheric neutrino results explain electric charge quantisation?
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abstract
We show that the SuperKamiokande atmospheric neutrino results explain electric charge quantisation, provided that the oscillation mode is $\nu_{\mu} \to \nu_{\tau}$ and that the neutrino mass is of Majorana type.
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How Charged Can Neutrinos Be?
Mini-charged neutrinos are viable only for flavor-universal U(1)_X extensions such as U(1)_{B-L} and U(1)_L, and their experimental constraints are model-dependent, with upper bounds ranging from 10^-19 e to 10^-21 e.