Precise BaBar results on e+ e- --> pi+ pi- and the muon magnetic moment

Michel Davier (LAL Orsay)
DESY Hörsaal, 17:00h

A new precise measurement of the e+ e- --> pi+ pi- cross section using the Initial State Radiation method has been recently released by the BaBar Collaboration. This analysis presents several advantages over previous determinations. The new data has a strong impact on the calculation of the contribution from hadronic vacuum polarization to the Standard Mode prediction of the muon magnetic moment. The different input data from e+ e- annihilation and tau decays are evaluated and the present state of the comparison with the direct measurement is discussed.

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