Effect of steriles states on lepton magnetic moments and neutrinoless double beta decay

Abstract

We address the impact of sterile fermion states on the anomalous magnetic moment of charged leptons, as well as their contribution to neutrinoless double beta decays. We illustrate our results in a minimal, effective extension of the Standard Model by one sterile fermion state, and in a well-motivated framework of neutrino mass generation, embedding the Inverse Seesaw into the Standard Model. The simple "3+1" effective case succeeds in alleviating the tension related to the muon anomalous magnetic moment, albeit only at the 3$\sigma$ level, and for light sterile states (corresponding to a }cosmologically disfavoured regime). Interestingly, our analysis shows that a future $0\nu 2\beta$ observation does not necessarily imply an inverted hierarchy for the active neutrinos in this simple extension. Although the Inverse Seesaw realisation here addressed could indeed ease the tension in $(g-2{)}_{\mu }$, bounds from lepton universality in kaon decays mostly preclude this from happening. However, these scenarios can also have a strong impact on the interpretation of a future $0\nu 2\beta$ signal regarding the hierarchy of the active neutrino mass spectrum.

25 pages, 19 figures

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Cited by in corpus (12)

• Neutrinoless Double-Beta Decay: a Probe of Physics Beyond the Standard Model
• Indirect searches for sterile neutrinos at a high-luminosity Z-factory
• Arbitrary mass Majorana neutrinos in neutrinoless double beta decay
• The Inverse Seesaw in Conformal Electro-Weak Symmetry Breaking and Phenomenological Consequences
• Dark Matter and the elusive ${\mathbf{Z}}^{\prime }$ in a dynamical Inverse Seesaw scenario
• On the role of leptonic CPV phases in cLFV observables
• Minimal inverse-seesaw mechanism with Abelian flavour symmetries
• Flavour and CP symmetries in the inverse seesaw
• Naturalness and lepton number/flavor violation in inverse seesaw models
• Zooming in on eV-MeV Scale Sterile Neutrinos in light of Neutrinoless Double Beta Decay
• Study of neutrinoless double beta decay in the Standard Model extended with sterile neutrinos
• Confronting the inverse seesaw mechanism with the recent muon g-2 result