Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2009-08-31
Physics
High Energy Physics
High Energy Physics - Phenomenology
9 pages, 7 figures. Version published in Eur. Phys. J. C. The theory vs. experiment discrepancy increased by 0.1 \sigma, using
Scientific paper
10.1140/epjc/s10052-010-1246-1
Using recently published, high-precision pi+pi- cross section data by the BABAR experiment from the analysis of e+e- events with high-energy photon radiation in the initial state, we reevaluate the lowest order hadronic contribution a_mu[had,LO] to the anomalous magnetic moment of the muon. We employ newly developed software featuring improved data interpolation and averaging, more accurate error propagation and systematic validation. With the new data, the discrepancy between the e+e- and tau-based results for the dominant two-pion mode reduces from previously 2.4 sigma to 1.5 sigma in the dispersion integral, though significant local discrepancies in the spectra persist. 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 Model prediction of a_mu differs from the experimental value by 3.2 sigma.
Davier Michel
Hoecker Andreas
Malaescu Bogdan
Yuan Chang-Zheng
Zhang Zhongsheng
No associations
LandOfFree
Reevaluation of the hadronic contribution to the muon magnetic anomaly using new e+e- -> pi+pi- cross section data from BABAR does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with Reevaluation of the hadronic contribution to the muon magnetic anomaly using new e+e- -> pi+pi- cross section data from BABAR, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Reevaluation of the hadronic contribution to the muon magnetic anomaly using new e+e- -> pi+pi- cross section data from BABAR will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-219920