The Hadronic Contribution to the Muon g-2

Details The Hadronic Contribution to the Muon g-2 The Hadronic Contribution to the Muon g-2

2004-10-05

arxiv.org/abs/hep-ph/0410081v2

Physics

High Energy Physics

High Energy Physics - Phenomenology

Invited talk given at the 32nd International Conference on High-Energy Physics (ICHEP'04), Beijing, China, August 2004; 6 page

Scientific paper

The evaluation of the hadronic contribution to the muon magnetic anomaly a_mu is reviewed, including a new estimate using precise results on the pi+pi- spectral function from the KLOE Collaboration. It is found that the KLOE data confirm to some extent the previous e+e- annihilation data in this channel, and accentuate the disagreement with the isospin-breaking-corrected spectral function from tau- -> pi-pi0 nu decays. Correcting for the empirical difference in the mass of the charged and the neutral rho locally improves, but does not resolve this discrepancy. A preliminary reevaluation (including the KLOE data) of the e+e- -based Standard Model prediction of a_mu results in a deviation of 2.7 standard deviations from the BNL measurement.

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