Abstract
We present singlet-Majoron couplings to Standard Model particles through two loops at leading order in the seesaw expansion, including couplings to gauge bosons as well as flavor-changing quark interactions. We discuss and compare the relevant phenomenological constraints on Majoron production as well as decaying Majoron dark matter. A comparison with standard seesaw observables in low-scale settings highlights the importance of searches for lepton-flavor-violating two-body decays $\ell \to \ell' +$Majoron in both the muon and tau sectors.
Highlights
The Standard Model (SM) has emerged as an incredibly accurate description of our world at the particle level
Renormalizable models could have a dynamical origin for ΔL 1⁄4 2 via spontaneous breaking of the global Uð1ÞL symmetry. This leads to the same Weinberg operator and Majorana neutrino masses, but as a result of the spontaneous breaking of a continuous global symmetry a Goldstone boson appears in the spectrum
It is commonplace to see these amplitudes interpreted as effective couplings as they appear to match onto effective field theory (EFT) operators of the form [49]
Summary
The Standard Model (SM) has emerged as an incredibly accurate description of our world at the particle level. Argue that the established observation of nonzero neutrino masses is a sign for physics beyond the SM and for possible lepton number violation by two units This argument is based on an interpretation of the SM as an effective field theory (EFT) and the observation that the leading non-renormalizable operator is Weinberg’s dimension-five operator ðL HÞ2=Λ [1]. This leads to the same Weinberg operator and Majorana neutrino masses, but as a result of the spontaneous breaking of a continuous global symmetry a Goldstone boson appears in the spectrum This pseudoscalar Goldstone boson of the lepton number symmetry was proposed a long time ago and was dubbed the Majoron [3,4].
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