The smallest neutrino mass
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 10-13eV in the SM and m 10-10 eV (tanBeta/10)4 in the MSSM, compatible with the restricted range suggested by Affleck-Dine baryogenesis.
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