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.
Neutrino Physics in the Seesaw Model
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The seesaw model of heavy and light Majorana neutrinos and its low-energy effective theory are studied, when the number of heavy neutrinos is equal to or less than the number of light lepton generations. We establish a general relationship between the high-energy parameters and the low-energy observables involving only the light fields. It is shown how low-energy measurements of the properties of light neutrinos suffice a priori to determine all couplings of the unobserved heavy neutrinos. CP violation is present in low-energy processes if seesaw-model leptogenesis creates the matter-antimatter asymmetry of the universe.
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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.