New Limits on Exotic Muon Interactions Mediated by Axion-Like Particles

The precise measurement of the muon anomalous magnetic moment $a_{\mu }$ provides a sensitive probe of exotic interactions between muons mediated by light beyond the Standard Model (BSM) bosons. Recent advances in both experiment and theory have largely reconciled the long-standing discrepancy in $a_{\mu }$. Using the latest result, $\mathrm{\Delta }{a}_{\mu }=a_{\mu }^{\mathrm{e}\mathrm{x}\mathrm{p}}-a_{\mu }^{\mathrm{S}\mathrm{M}}=(38\pm 63)\times {10}^{-11}$, we derive updated limits on light BSM boson-mediated exotic muon interactions.