Abstract
We consider models where one Majorana neutrino is massless at tree level (like the see-saw with two right-handed neutrinos), and compute the contribution to its mass m generated by two-loop quantum corrections. The result is m ∼ 10 −13 eV in the SM and m ∼ 10 −10 eV ⋅ ( tan β / 10 ) 4 in the MSSM, compatible with the restricted range suggested by Affleck–Dine baryogenesis.
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