Ablikim, M.Achasov, M. N.Ai, X. C.Albayrak, O.Albrecht, M.Ambrose, D. J.Amoroso, A.Lou, XinchouBESIII Collaboration2016-09-262016-09-262015-11-282015-11-280370-2693http://hdl.handle.net/10735.1/5080We extract the e⁺e⁻ → π⁺π⁻ cross section in the energy range between 600 and 900 MeV, exploiting the method of initial state radiation. A data set with an integrated luminosity of 2.93 fb⁻¹ taken at a center-of-mass energy of 3.773 GeV with the BESIII detector at the BEPCII collider is used. The cross section is measured with a systematic uncertainty of 0.9%. We extract the pion form factor |Fπ|² as well as the contribution of the measured cross section to the leading-order hadronic vacuum polarization contribution to (g - 2)μ. We find this value to be a(μ)^{ππ,LO} (600-900 MeV) = (368.2 ± 2.5(stat) ± 3.3(sys)).10⁻¹⁰, which is between the corresponding values using the BaBar or KLOE data.enCC BY 4.0 (Attribution)©2015 The Authorshttp://creativecommons.org/licenses/by/4.0/MuonsPionsElectronsElectron-positron interactionsAnnihilation reactionsHadronsParticles (Nuclear physics)—FlavorArticleAblikim, M., M. N. Achasov, X. C. Ai, O. Albayrak, et al. 2016. "Measurement of the e⁺e⁻ → pi(+) pi(-) cross section between 600 and 900 MeV using initial state radiation." Physics Letters B 753, doi:10.1016/j.physletb.2015.11.043753