Abstract
In February 2001, the Muon (g-2) Collaboration of the E821 experiment at the Brookhaven AGS released a new value of the anomalous magnetic moment of the muon a μ , measured with an unprecedented accuracy of 1.3 ppm [parts per million]. This annoucement has caused quite some excitement in the particle physics community. Indeed, this experimental value was claimed to show a deviation of 2.6 σ with one of the most accurate evaluations of the anomalous magnetic moment of the muon within the standard model. It was subsequently shown that a sign error in one of the theoretical contributions was responsible for a sizeable part of this discrepancy, which eventually only amounted to 1.6 σ. However, this event had the merit to draw the attention to the fact that low energy but high precision experiments represent real potentialities, complementary to the high energy accelerator programs, for evidencing possible new degrees of freedom, supersymmetry or whatever else, beyond those described by the standard model of electromagnetic, weak, and strong interactions.
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Knecht, M. The Anomalous Magnetic Moment of the Muon: A Theoretical Introduction. In: Meissner, UG., Plessas, W. (eds) Lectures on Flavor Physics. Lecture Notes in Physics, vol 629. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-540-44457-2_2
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