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  • Measurement of the e+e−→π+π...
    Ban, Y.; Cheng, H.P.; Dai, H.L.; Denig, A.; Ding, Y.; Dong, C.; Du, S.X.; Fang, J.; Fang, Y.; Goetzen, K.; Gong, W.X.; Gradl, W.; Guo, Y.; Guo, Y.P.; Haddadi, Z.; Hao, X.Q.; Harris, F.A.; Hu, H.M.; Hu, T.; Ji, Q.P.; Ji, X.B.; Jiang, X.Y.; Johansson, T.; Julin, A.; Kavatsyuk, M.; Kiese, P.; Kloss, B.; Li, Jin; Li, Lei; Li, T.; Li, W.G.; Li, X.N.; Li, Z.B.; Liu, B.J.; Liu, J.P.; Liu, J.Y.; Liu, S.B.; Loehner, H.; Lu, J.G.; Luo, X.L.; Ma, X.Y.; Mao, Y.J.; Messchendorp, J.G.; Mitchell, R.E.; Mo, Y.J.; Nerling, F.; Nikolaev, I.B.; Peters, K.; Prasad, V.; Qin, Z.H.; Rashid, K.H.; Ripka, M.; Santoro, V.; Schumann, S.; Shao, M.; Shen, C.P.; Shen, P.X.; Shen, X.Y.; Sosio, S.; Sun, G.X.; Sun, J.F.; Sun, Y.J.; Sun, Y.Z.; Sun, Z.J.; Thorndike, E.H.; Tiemens, M.; Ullrich, M.; Uman, I.; Varner, G.S.; Wang, B.; Wang, S.G.; Wang, W.; Wang, X.F.; Wang, Z.; Wang, Z.G.; Weber, T.; Wei, D.H.; Wu, L.H.; Xia, Y.; Xiao, H.; Yan, W.B.; Yan, W.C.; Yang, H.X.; Yin, J.H.; Yu, J.S.; Zhang, C.; Zhang, J.Z.; Zhang, Z.Y.; Zhao, G.; Zhao, J.Y.; Zhao, Ling; Zhao, S.J.; Zhao, T.C.; Zheng, B.; Zhong, B.; Zhou, L.; Zhou, X.; Zhu, K.J.; Zhu, Z.A.; Zotti, L.

    Physics letters. B, 02/2016, Letnik: 753, Številka: C
    Journal Article

    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 aμππ,LO(600–900MeV)=(368.2±2.5stat±3.3sys)⋅10−10, which is between the corresponding values using the BaBar or KLOE data.