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Pseudo-Dirac neutrinos in the new standard model
The addition of gauge-singlet fermions to the standard model Lagrangian renders the neutrinos massive and allows one to explain all that is experimentally known about neutrino masses and lepton mixing by varying the values of the Majorana mass parameters $M$ for the gauge singlets and the neutrino Yukawa couplings $\ensuremath{\lambda}$. …