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Using recently published, high-precision pi+pi- cross section data by theBABAR experiment from the analysis of e+e- events with high-energy photonradiation in the initial state, we reevaluate the lowest order hadroniccontribution a_mu[had,LO] to the anomalous magnetic moment of the muon. Weemploy newly developed software featuring improved data interpolation andaveraging, more accurate error propagation and systematic validation. With thenew data, the discrepancy between the e+e- and tau-based results for thedominant two-pion mode reduces from previously 2.4 sigma to 1.5 sigma in thedispersion integral, though significant local discrepancies in the spectrapersist. We obtain for the e+e- based evaluation amu[had,LO] = (695.5 +- 4.1)10^-10, where the error accounts for all sources. The full Standard Modelprediction of a_mu differs from the experimental value by 3.2 sigma.

Reevaluation of the hadronic contribution to the muon magnetic anomaly using new e+e- -> pi+pi- cross section data from BABAR