Precise measurement of the e+e-→π+π-(γ) cross section with the initial state radiation method at BABAR

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doi:10.1103/PhysRevLett.103.231801

A precise measurement of the cross section of the process e+e-→π+π-(γ) from threshold to an energy of 3 GeV is obtained with the initial state radiation (ISR) method using 232fb-1 of data collected with the BABAR detector at e+e- center-of-mass energies near 10.6 GeV. The ISR luminosity is determined from a study of the leptonic process e+e-→μ+μ-γ(γ). The leading-order hadronic contribution to the muon magnetic anomaly calculated using the ππ cross section measured from threshold to 1.8 GeV is (514.1±2.2(stat)±3.1(syst))×10- 10.

Aubert, B., Karyotakis, Y., Lees, J., Poireau, V., Prencipe, E., Prudent, X., et al. (2009). Precise measurement of the e+e-→π+π-(γ) cross section with the initial state radiation method at BABAR. PHYSICAL REVIEW LETTERS, 103(23) [10.1103/PhysRevLett.103.231801].