Measurement of the e+e− → π+π− cross section between 600 and 900 MeV using initial state radiation
YazarKolcu, Onur Buğra
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KünyeKolcu, O. B., ... (2016). Measurement of the e+e− → π+π− cross section between 600 and 900 MeV using initial state radiation. Physics Letters B. 753, 629–638.
We 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 View the MathML source, which is between the corresponding values using the BaBar or KLOE data.