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.
Tensor reduction of two-loop vacuum diagrams and projectors for expanding three-point functions
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abstract
Explicit general formulae for the tensor reduction of two-loop massive vacuum diagrams are presented. The problem of calculating the corresponding coefficients is shown to be equivalent to the problem of constructing differential operators (projectors) extracting the coefficients of the momentum expansion of massive scalar three-point functions (with any number of loops), so the solution to the latter problem is also given.
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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.