The complete leading-order two-loop Majoron couplings to all Standard Model gauge bosons and to flavor-changing quarks are derived, and they change the expected photon coupling and rare-decay rates compared with earlier one-loop estimates.
Renormalization of Lepton Mixing for Majorana Neutrinos
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abstract
We discuss the one-loop electroweak renormalization of the leptonic mixing matrix in the case of Majorana neutrinos, and establish its relationship with the renormalization group evolution of the dimension five operator responsible for the light Majorana neutrino masses. We compare our results in the effective theory with those in the full seesaw theory.
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The Majoron at two loops
The complete leading-order two-loop Majoron couplings to all Standard Model gauge bosons and to flavor-changing quarks are derived, and they change the expected photon coupling and rare-decay rates compared with earlier one-loop estimates.