Electron $g-2$ Foreshadowing Discoveries at FCC-ee

Abstract

A future $e^+e^-$ circular collider (FCC-ee) may provide a unique probe of the electron Yukawa coupling through Higgs boson production on resonance. Motivated by this exciting possibility, we examine a simple model which can result in $\mathcal{O}(10)$ modifications of the Higgs coupling to electrons. The model can also lead to deviations in the electron anomalous magnetic moment, $g_e-2$, which at present shows a $+2.2\sigma$ or $-3.7\sigma$ deviation, implied by differing precision determinations of the electromagnetic fine structure constant. The electron $g_e-2$ can be a forerunner for FCC-ee discoveries which, as we elucidate, may not be accessible to the high-luminosity LHC measurements. A simple extension of our model can also account for the current deviation in the muon $g_\mu-2$.