Muon $g-2$ Anomaly and Neutrino Magnetic Moments

Abstract

We show that a unified framework based on an $SU(2{)}_H$ horizontal symmetry which generates a naturally large neutrino transition magnetic moment and explains the XENON1T electron recoil excess also predicts a positive shift in the muon anomalous magnetic moment. This shift is of the right magnitude to be consistent with the Brookhaven measurement as well as the recent Fermilab measurement of the muon $g-2$. A relatively light neutral scalar from a Higgs doublet with mass near 100 GeV contributes to muon $g-2$, while its charged partner induces the neutrino magnetic moment. In contrast to other multi-scalar theories, in the model presented here there is no freedom to control the sign and strength of the muon $g-2$ contribution. We analyze the collider tests of this framework and find that the HL-LHC can probe the entire parameter space of these models.

5 pages + references, 4 figures, expanded discussion on astrophysical bound, matches published version

References in corpus (7)

• Measurement of the fine-structure constant as a test of the Standard Model
• The $g-2$ of charged leptons, $\alpha (M_Z^2)$ and the hyperfine splitting of muonium
• Hadronic contribution to the muon anomalous magnetic moment to next-to-next-to-leading order
• Improved predictions for g-2 of the muon and α_{\rm QED}(M_Z^2)
• Limiting neutrino magnetic moments with Borexino Phase-II solar neutrino data
• Hadronic light-by-light scattering contribution to the muon anomalous magnetic moment from lattice QCD
• The RGB tip of galactic globular clusters and the revision of the bound of the axion-electron coupling

Cited by in corpus (3)

• Neutrino Up-scattering via the Dipole Portal at Forward LHC Detectors
• Muon $(g-2)$ and Flavor Puzzles in the $U(1{)}_X^{}$-gauged Leptoquark Model
• General Remarks on the One-loop Contributions to the Muon Anomalous Magnetic Moment