In quantum theory, the magnetic moment of the muon should be twice the value calculated classically, although in fact their ratio is not exactly two. Theory and experiment disagree on quite how far from two it is.
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Peach, K. Two is the magic number. Nature 427, 688–689 (2004). https://doi.org/10.1038/427688a
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DOI: https://doi.org/10.1038/427688a
