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.
Neutrino mass and mirror universe
1 Pith paper cite this work. Polarity classification is still indexing.
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abstract
The existence of the mirror world, with the same microphysics as our own one but with opposite P-asymmetry, not only restores an exact equivalence between left and right but also naturally explains, via a see-saw like mechanism, why the neutrino is ultralight.
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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.