The anomalous magnetic moment of the muon

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Abstract
A historical survey of the measurements of the gyromagnetic ratio g of the muon. A brief introduction is given to the theory of the ‘anomalous magnetic moment’ a ≡ ½ (g-2) and its significance is explained. The main part of the review concerns the successive (g–-2) experiments to measure a directly, with gradually increasing accuracy. At present experiment and theory agree to (13 ± 29) parts in 109 in g, and the muon still obeys the rules of quantum electrodynamics for a structureless point charge.