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Measurement of the e + e − → π + π − cross section between 600 and 900 MeV using initial state radiation
- Collaboration, BESIII;
- Ablikim, M;
- Achasov, MN;
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- Cibinetto, G;
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- Marcello, S;
- Messchendorp, JG;
- Min, J;
- Mitchell, RE;
- Mo, XH;
- Mo, YJ;
- Morales, C Morales;
- Moriya, K;
- Muchnoi, N Yu;
- Muramatsu, H;
- Nefedov, Y;
- Nerling, F;
- Nikolaev, IB;
- Ning, Z;
- Nisar, S;
- Niu, SL;
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- Olsen, SL;
- Ouyang, Q;
- Pacetti, S;
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- Ye, M;
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- Yin, JH;
- Yu, BX;
- Yu, CX;
- Yu, JS;
- Yuan, CZ;
- Yuan, WL;
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- Zafar, AA;
- Zallo, A;
- Zeng, Y;
- Zhang, BX;
- Zhang, BY;
- Zhang, C;
- Zhang, CC;
- Zhang, DH;
- Zhang, HH;
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- Zhang, JJ;
- Zhang, JL;
- Zhang, JQ;
- Zhang, JW;
- Zhang, JY;
- Zhang, JZ;
- Zhang, K;
- Zhang, L;
- Zhang, XY;
- Zhang, Y;
- Zhang, YN;
- Zhang, YH;
- Zhang, YT;
- Zhang, Yu;
- Zhang, ZH;
- Zhang, ZP;
- Zhang, ZY;
- Zhao, G;
- Zhao, JW;
- Zhao, JY;
- Zhao, JZ;
- Zhao, Lei;
- Zhao, Ling;
- Zhao, MG;
- Zhao, Q;
- Zhao, QW;
- Zhao, SJ;
- Zhao, TC;
- Zhao, YB;
- Zhao, ZG;
- Zhemchugov, A;
- Zheng, B;
- Zheng, JP;
- Zheng, WJ;
- Zheng, YH;
- Zhong, B;
- Zhou, L;
- Zhou, X;
- Zhou, XK;
- Zhou, XR;
- Zhou, XY;
- Zhu, K;
- Zhu, KJ;
- Zhu, S;
- Zhu, SH;
- Zhu, XL;
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- Zhu, ZA;
- Zhuang, J;
- Zotti, L;
- Zou, BS;
- Zou, JH
- et al.
Published Web Location
http://doi.org/10.1016/j.physletb.2015.11.043No data is associated with this publication.
Abstract
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.
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