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I have a question about a finite mass neutrino. If it is so, then it takes
over
as the smallest non-zero mass particle from the electron. When photons with
energies above twice the electron rest mass pass through matter, they create
electron/positron pairs. So if neutrinos of mass 0.07 eV exist why don't
photons
of energy > 0.14 eV create neutrino/antineutrino pairs? (And how would optics
be different if they did?)