Led by researchers from Sun Yat-sen University, the Institute of Modern Physics of the Chinese Academy of Sciences, and multiple collaborating institutions across China, MACE is designed to search for the spontaneous conversion of muonium—a bound state of a positive muon and an electron—into its antimatter counterpart, antimuonium. Such a transition would violate lepton flavor conservation, a symmetry upheld by the Standard Model of particle physics, and point directly to new physics beyond current theory.
“The conversion of muonium to antimuonium represents a clean and unique probe of new physics in the leptonic sector,” explains the research team. “Unlike other charged lepton flavor violation processes, this conversion is sensitive to ∆Lℓ = 2 models that are fundamentally distinct and could reveal physics inaccessible to other experiments.”
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