Hadronic Contributions to the Photon Vacuum Polarization and their Role in Precision Physics

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  • 30 April 2001
Abstract
I review recent evaluations of the hadronic contribution to the shift in the fine structure constant and to the anomalous magnetic moment of the muon. Substantial progress in a precise determination of these important observables is a consequence of substantially improved total cross section measurement by the BES II collaboration and an improved theoretical understanding. Prospects of further possible progress is discussed.

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