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Abstract
Using data consisting of 2.93 fb-1 integrated luminosity at the centre of mass energy √s = 3773 MeV, recorded with the BESIII detector at BEPCII, the cross section and form factor |Fπ|2 was extracted in the energy range 600-900 MeV, using the method of radiative return. The cross section is used as input to calculate the leading-order vacuum polarisation contribution of the e+e-→π+π- channel to (g - 2)μ as aμ ππ,LO(600 — 900 MeV) = (368.2±2.5stat ±3.3sys) • 10-10. This result is compatible with corresponding values using KLOE data, but disagrees whit BaBar. The ongoing search for e+e-→ηc at BESIII is also discussed.
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1 Department of Physics and Astronomy, Uppsala University, Box 516, Sweden