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The Majoron at two loops
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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.
Forward citations
Cited by 8 Pith papers
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Enhanced active-sterile neutrino polarizability at the intensity frontier
A new neutrino-photon interaction involving a sterile neutrino is constrained at NOMAD and MiniBooNE, and a light-mediator realization can fit the MiniBooNE excess.
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ALP production in Lepton Flavour Violating meson, tau and gauge boson decays
ALPs with LFV couplings above the muon mass threshold can be produced in LFV meson, tau, and gauge boson decays, yielding clean eμ signatures that enable new searches at future experiments.
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New Constraints on Neutrino-Dark Matter Interactions: A Comprehensive Analysis
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Probing Lepton Number Violation at Same-Sign Lepton Colliders
A same-sign mu+ mu+ collider at 250 GeV to 1 TeV could discover or constrain lepton-number-violating signals from heavy neutral leptons and neutrinophilic scalars beyond existing experiments.
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Minimal Majoron Dark Matter from a Discrete $Z_N$ Gauge Symmetry
Discrete Z_N-protected majoron dark matter excludes Z_5, leaves Z_7/Z_11/Z_13 viable, and predicts a 1–10 MeV Z_7 majoron testable by COSI through 511 keV and γγ lines.
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About electroweak domain walls in Majoron models
Electroweak instantons alone do not produce Majoron domain walls; a tiny instanton mass from B+L breaking is cosmologically negligible and can act as a bias or dark energy.
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Rare two-body meson decays give the strongest current bounds on the ALP-W coupling for light ALPs, with Z-boson decays and future lepton colliders extending the reach to heavier masses.
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