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We propose a set of precision muon-related observables that serve as a toolto constrain new physics models. Using LEP's precision measurements on the$Z$-boson pole, we derive bounds on the new physics quantum contributions tothe decay $Z \to \mu^+ \mu^-$. We show that the new precision observables havea real impact on two specific models that solve the $g-2$ anomaly and provide asound dark matter candidate.

Precision Muon-Related Observables as a Tool to Constrain New Physics Models