Low energy hadronic contribution to the QED vacuum polarization
Abstract
Recent improvements in the low energy e+e- annihilation data and their influence on the determination of the hadronic contribution to the running of the QED fine structure constant at mZ are discussed. Using CMD-2 and KLOE measurements in the rho region we obtain Delta alpha(5)had(s) = 0.02758 +/- 0.00035 at s = mZ2.
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