A precise measurement of the anomalous g value, a_μ0ex0ex=0ex0ex(g-2)/2, for the positive muon has been made at the Brookhaven Alternating Gradient Synchrotron. The result a_μ⁺0ex0ex=0ex0ex11659202(14)(6)×10^-10 (1.3 ppm) is in good agreement with previous measurements and has an error one third that of the combined previous data. The current theoretical value from the standard model is a_μ(SM)0ex0ex=0ex0ex11659159.6(6.7)×10^-10 (0.57 ppm) and a_μ(exp)-a_μ(SM)0ex0ex=0ex0ex43(16)×10^-10 in which a_μ(exp) is the world average experimental value.
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Brown et al. (2001) studied this question.
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