Measurement of the e+e- --> hadrons cross-section at low energy with ISR events at BABAR

Details Measurement of the e+e- --> hadrons cross-section at low energy with ISR events at BABAR Measurement of the e+e- --> hadrons cross-section at low energy with ISR events at BABAR

2010-12-16

arxiv.org/abs/1012.3689v1

Physics

High Energy Physics

High Energy Physics - Experiment

On behalf of the BABAR Collaboration. Proceeding of the 11th International Workshop on Tau Lepton Physics - Manchester, UK, 13

Scientific paper

The precise measurement of the cross section e+e- --> pi+ pi-(gamma) from threshold to an energy of 3 GeV, using events with Initial State Radiation (ISR) collected with the BABAR detector, is presented. The ISR luminosity is determined from a study of the leptonic process e+e- --> mu+ mu- gamma(gamma), and the method is tested by the comparison with the next-to-leading order (NLO) QED prediction. The leading-order hadronic contribution to the muon magnetic anomaly calculated using the BABAR pi pi cross section measured from threshold to 1.8 GeV is (514.1 +- 2.2(stat) +- 3.1(syst)) * 10^{-10}. Other results on ISR multihadronic cross sections from BABAR are presented.

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