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, $\Delta a_\mu = a^{\rm exp}_\mu - a^{\rm SM}_\mu = (38 \pm 63) \times 10^{-11}$, we derive updated limits on light BSM boson-mediated exotic muon interactions.