Measurement of the E+e− → Π+π− Cross Section Between 600 and 900 MeV Using Initial State Radiation

M. Ablikim,M. N. Achasov,X. C. Ai,O. Albayrak,M. Albrecht,D. J. Ambrose,A. Amoroso,F. F. An,Q. An,J. Z. Bai,R. Baldini Ferroli,Y. Ban,D. W. Bennett,J. V. Bennett,M. Bertani,D. Bettoni,J. M. Bian,F. Bianchi,E. Boger,I. Boyko,R. A. Briere,H. Cai,X. Cai,O. Cakir,A. Calcaterra,G. F. Cao,S. A. Cetin,J. F. Chang,G. Chelkov,G. Chen,H. S. Chen,H. Y. Chen,J. C. Chen,M. L. Chen,S. J. Chen,X. Chen,X. R. Chen,Y. B. Chen,H. P. Cheng,X. K. Chu,G. Cibinetto,H. L. Dai,J. P. Dai,A. Dbeyssi,D. Dedovich,Z. Y. Deng,A. Denig,I. Denysenko,M. Destefanis,F. De Mori,Y. Ding,C. Dong,J. Dong,L. Y. Dong,M. Y. Dong,S. X. Du,P. F. Duan,E. E. Eren,J. Z. Fan, J. Fang,S. S. Fang,X. Fang,Y. Fang,L. Fava,F. Feldbauer,G. Felici,C. Q. Feng,E. Fioravanti,M. Fritsch,C. D. Fu, Q. Gao,X. Y. Gao,Y. Gao,Z. Gao,I. Garzia,K. Goetzen,W. X. Gong,W. Gradl,M. Greco,M. H. Gu,Y. T. Gu,Y. H. Guan,A. Q. Guo,L. B. Guo,Y. Guo,Y. P. Guo,Z. Haddadi,A. Hafner,S. Han,X. Q. Hao,F. A. Harris,K. L. He,X. Q. He,T. Held,Y. K. Heng,Z. L. Hou,C. Hu,H. M. Hu,J. F. Hu,T. Hu,Y. Hu, G. M. Huang,G. S. Huang,J. S. Huang,X. T. Huang,Y. Huang,T. Hussain,Q. Ji,Q. P. Ji,X. B. Ji,X. L. Ji,L. W. Jiang,X. S. Jiang,X. Y. Jiang,J. B. Jiao,Z. Jiao,D. P. Jin,S. Jin,T. Johansson,A. Julin,N. Kalantar-Nayestanaki,X. L. Kang,X. S. Kang,M. Kavatsyuk,B. C. Ke, P. Kiese, R. Kliemt,B. Kloss,O. B. Kolcu,B. Kopf, M. Kornicer, W. Kuehn,A. Kupsc,J. S. Lange,M. Lara,P. Larin,C. Leng, C. Li, Cheng Li, D. M. Li,F. Li,F. Y. Li,G. Li,H. B. Li,J. C. Li,Jin Li,K. Li, Lei Li,P. R. Li,T. Li,W. D. Li,W. G. Li,X. L. Li,X. M. Li,X. N. Li,X. Q. Li,Z. B. Li,H. Liang,Y. F. Liang,Y. T. Liang,G. R. Liao,D. X. Lin,B. J. Liu,C. X. Liu,F. H. Liu,Fang Liu,Feng Liu,H. B. Liu,H. H. Liu,H. M. Liu, J. Liu,J. B. Liu,J. P. Liu,J. Y. Liu,K. Liu,K. Y. Liu,L. D. Liu,P. L. Liu,Q. Liu,S. B. Liu,X. Liu,Y. B. Liu,Z. A. Liu,Zhiqing Liu,H. Loehner,X. C. Lou,H. J. Lu,J. G. Lu,Y. Lu,Y. P. Lu,C. L. Luo,M. X. Luo,T. Luo,X. L. Luo,X. R. Lyu,F. C. Ma,H. L. Ma,L. L. Ma,Q. M. Ma,T. Ma,X. N. Ma,X. Y. Ma,F. E. Maas,M. Maggiora,Y. J. Mao,Z. P. Mao,S. Marcello,J. G. Messchendorp,J. Min,R. E. Mitchell,X. H. Mo,Y. J. Mo, Morales,K. Moriya,N. Yu Muchnoi,H. Muramatsu,Y. Nefedov, F. Nerlingn,I. B. Nikolaev,Z. Ning,S. Nisar,S. L. Niu,X. Y. Niu,S. L. Olsen,Q. Ouyang,S. Pacetti,P. Patteri,M. Pelizaeus,H. P. Peng,K. Peters,J. Pettersson,J. L. Ping,R. G. Ping,R. Poling,V. Prasad,M. Qi,S. Qian,C. F. Qiao,L. Q. Qin,N. Qin,X. S. Qin,Z. H. Qin,J. F. Qiu,K. H. Rashid,C. F. Redmer,M. Ripka,G. Rong,Ch. Rosner,X. D. Ruan,V. Santoro,A. Sarantsev,M. Savrie,K. Schoenning,S. Schumann,W. Shan,M. Shao, C. P. Shen,P. X. Shen,X. Y. Shen,H. Y. Sheng,W. M. Song,M. R. Shepherd,X. Y. Song,S. Sosio,S. Spataro,G. X. Sun, J. F. Sun,S. S. Sun, Y. J. Sun,Y. Z. Sun,Z. J. Sun,Z. T. Sun,C. J. Tang,X. Tang,I. Tapan,E. H. Thorndike,M. Tiemens,M. Ullrich,I. Uman,G. S. Varner,B. Wang, D. Wang,D. Y. Wang,K. Wang,L. L. Wang,L. S. Wang,M. Wang,P. Wang,P. L. Wang, S. G. Wang,W. Wang,X. F. Wang,Y. D. Wang,Y. F. Wang,Y. Q. Wang,Z. Wang,Z. G. Wang,Z. H. Wang,Z. Y. Wang,T. Weber,D. H. Wei,J. B. Wei,P. Weidenkaff,S. P. Wen,U. Wiedner,M. Wolke,L. H. Wu,Z. Wu,L. G. Xia, Y. Xia,D. Xiao,H. Xiao,Z. J. Xiao,Y. G. Xie,Q. L. Xiu,G. F. Xu,L. Xu,Q. J. Xu,X. P. Xu,L. Yan,W. B. Yan,W. C. Yan,Y. H. Yan, H. J. Yang,H. X. Yang,L. Yang,Y. Yang,Y. X. Yang,M. Ye,M. H. Ye,J. H. Yin,B. X. Yu,C. X. Yu,J. S. Yu,C. Z. Yuan,W. L. Yuan,Y. Yuan,A. Yuncu,A. A. Zafar, A. Zallo,Y. Zeng, B. X. Zhang,B. Y. Zhang,C. Zhang,C. C. Zhang, D. H. Zhang, H. H. Zhang,H. Y. Zhang,J. J. Zhang,J. L. Zhang,J. Q. Zhang,J. W. Zhang,J. Y. Zhang,J. Z. Zhang,K. Zhang, L. Zhang,X. Y. Zhang,Y. Zhang,Y. N. Zhang,Y. H. Zhang,Y. T. Zhang,Yu Zhang,Z. H. Zhang,Z. P. Zhang,Z. Y. Zhang,G. Zhao,J. W. Zhao,J. Y. Zhao,J. Z. Zhao,Lei Zhao,Ling Zhao,M. G. Zhao,Q. Zhao,Q. W. Zhao,S. J. Zhao,T. C. Zhao,Y. B. Zhao,Z. G. Zhao,A. Zhemchugov,B. Zheng,J. P. Zheng,W. J. Zheng,Y. H. Zheng,B. Zhong,L. Zhou,X. Zhou,X. K. Zhou,X. R. Zhou,X. Y. Zhou,K. Zhu,K. J. Zhu,S. Zhu,S. H. Zhu,X. L. Zhu,Y. C. Zhu,Y. S. Zhu,Z. A. Zhu,J. Zhuang,L. Zotti,B. S. Zou,J. H. Zou

Physics Letters B（2016）

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摘要

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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Hadronic cross section,Muon anomaly,Initial state radiation,Pion form factor,BESIII

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