Muon and electron g − 2 and lepton masses in flavor models

Abstract

The stringent experimental bound on μ → eγ is compatible with a simultaneous and sizable new physics contribution to the electron and muon anomalous magnetic moments (g − 2) (ℓ = e, μ), only if we assume a non-trivial flavor structure of the dipole operator coefficients. We propose a mechanism in which the realization of the (g − 2) correction is manifestly related to the mass generation through a flavor symmetry. A radiative flavon correction to the fermion mass gives a contribution to the anomalous magnetic moment. In this framework, we introduce a chiral enhancement from a non-trivial \( \mathcal{O} \)(1) quartic coupling of the scalar potential. We show that the muon and electron anomalies can be simultaneously explained in a vast region of the parameter space with predicted vector-like mediators of masses as large as ∈ [0.6, 2.5] TeV.

A preprint version of the article is available at ArXiv.

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Correspondence to Aurora Melis.

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Calibbi, L., López-Ibáñez, M.L., Melis, A. et al. Muon and electron g − 2 and lepton masses in flavor models. J. High Energ. Phys. 2020, 87 (2020). https://doi.org/10.1007/JHEP06(2020)087

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Keywords

  • Precision QED
  • Beyond Standard Model
  • Effective Field Theories
  • Quark Masses and SM Parameters