Measurement of the e+e−→π+π− cross section between 600 and 900 MeV using initial state radiation

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...

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Veröffentlicht in:	Physics letters. B 2016-02, Vol.753 (C), p.629-638
Hauptverfasser:	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.
Format:	Artikel
Sprache:	eng
Schlagworte:	BESIII Hadronic cross section Initial state radiation Muon anomaly PHYSICS OF ELEMENTARY PARTICLES AND FIELDS Pion form factor
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Beschreibung
Zusammenfassung:	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.
ISSN:	0370-2693 1873-2445
DOI:	10.1016/j.physletb.2015.11.043