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A new evaluation of the hadronic vacuum polarization contribution to the muonmagnetic moment is presented. We take into account the reanalysis of thelow-energy e+e- annihilation cross section into hadrons by the CMD-2Collaboration. The agreement between e+e- and tau spectral functions in the pipi channel is found to be much improved. Nevertheless, significantdiscrepancies remain in the center-of-mass energy range between 0.85 and 1.0GeV, so that we refrain from averaging the two data sets. The values found forthe lowest-order hadronic vacuum polarization contributions are a_mu[had,LO] =(696.3 +- 6.2[exp] +- 3.6[rad])e-10 (e+e- -based) and a_mu[had,LO] = (711.0 +-5.0[exp] +- 0.8[rad] +- 2.8[SU2])e-10 (tau-based), where the errors have beenseparated according to their sources: experimental, missing radiativecorrections in e+e- data, and isospin breaking. The corresponding StandardModel predictions for the muon magnetic anomaly read a_mu = (11,659,180.9 +-7.2[had] +- 3.5[LBL] +- 0.4[QED+EW])e-10 (e+e- -based) and a_mu = (11,659,195.6+- 5.8[had] +- 3.5[LBL] +- 0.4[QED+EW])e-10 (tau-based), where the errorsaccount for the hadronic, light-by-light (LBL) scattering and electroweakcontributions. The deviations from the measurement at BNL are found to be (22.1+- 7.2 +- 3.5 +- 8.0)e-10 (1.9 sigma) and (7.4 +- 5.8 +- 3.5 +- 8.0)e-10 (0.7sigma) for the e+e- and tau-based estimates, respectively, where the seconderror is from the LBL contribution and the third one from the BNL measurement.Comment: 14 pages, 7 figures (to be submitted to Phys Lett B

Updated estimate of the muon magnetic momentusing revised results from e + e -annihilation