Measurement of the e + e − → π + π − cross section between 600 and 900 MeV using initial state radiation M Ablikim , H X Yang , T Hussain , T Held , G Varner , F H Liu , T Li , W X Gong , X Tang , Wenlei Shan , Y Hu , Ling Zhao , J F Qiu , Hui Xiao , Z Y Zhang , R A Briere , P F Duan , X Q He , A Zhemchugov , K Goetzen , J S Yu , S L Olsen , H M Hu , K Peters , I Tapan , Y G Xie , M Kornicer , X Y Niu , Y F Wang , Z Y Deng , S A Cetin , H P Peng , Minzu Wang , S Pacetti , Bo Zheng , Z G Zhao , Y J Mao , I Boyko , S X Du , H L Dai , M Destefanis , H P Cheng , Tao Luo , M Albrecht , Y P Guo , Y B Zhao , P L Wang , Tao Ma , A Kupsc , Q Gao , K Y Liu , C C Zhang , Y Huang , M N Achasov , D X Lin , T Weber , K Moriya , U Wiedner , Y J Mo , Y H Guan , B Y Zhang , T Hu , X F Wang , C Dong , X T Huang , Z B Li , Zhen Jiao , L Zotti , E Fioravanti , J C Li , J L Ping , R E Mitchell , G Rong , D Bettoni , Lei Li , S Marcello , H Y Sheng , D M Li , Y C Zhu , Zhen Ning , Jonas Pettersson , Y J Sun , Z Haddadi , A Calcaterra , F F An , T C Zhao , S S Fang , Li Zhou , F C Ma , I Uman , S Sosio , A Q Guo , B J Liu , I Garzia , C Z Yuan , L G Xia , C J Tang , L Q Qin , Q An , A G Denig , J S Lange , X Y Song , W J Zheng , Shuangyin Han , J S Huang , A Zallo , C X Yu , A Hafner , D Y Wang , H H Zhang , C D Fu , O Cakir , Z J Sun , K L He , E H Thorndike , J P Zheng , J P Liu , M Tiemens , Ming Shao , Z A Zhu , M Qi , Z A Liu , S P Wen , K Schoenning , O Albayrak , X Y Shen , Yong Bin Liu , G F Xu , C F Qiao , Fu Yun Li , X R Chen , Z Y Wang , Y T Gu , Q W Zhao , J C Chen , H B Li , X S Qin , J B Jiao , Y Nefedov , F E Maas , A Amoroso , L Fava , Ch Rosner , G Cibinetto , Hui Jing Lu , Hongwei Liang , Y H Zheng , Guixiang Zhao , L H Wu , D W Bennett , B X Yu , Z H Qin , F Bianchi , S J Zhao , Y Ding , L S Wang , Xiaoqiang Cai , A Dbeyssi , M Savrie , C L Luo , R Baldini Ferroli , L W Jiang , Qi Ouyang , C P Shen , Lvnan Yan , R Kliemt , P R Li , M X Luo , C Li , C F Redmer , Qi Liu , M Pelizaeus , X C Ai , Y P Lu , H L Ma , Jingyun Fang , N Qin , W D Li , X L Luo , L D Liu , L Y Dong , J B Wei , B C Ke , B Zhong , Z J Xiao , R Poling , S B Liu , J Min , W Gradl , H Y Chen , X L Kang , A V Sarantsev , Xiuqin Fang , P L Liu , L B Guo , W C Yan , B S Zou , X Y Ma , C Q Feng , X L Ji , H Loehner , Yang Xia , Hisako Muramatsu , X Y Gao , George Li , C X Liu , L Xu , E Boger , M Maggiora , Jingyuan Dong , S H Zhu , Z P Mao , A Yuncu , Y H Yan , D Xiao , J F Chang , M Kavatsyuk , H M Liu , M L Chen , Sijin Qian , M R Shepherd , M Ripka , Chiiwhei Hu , Bo Wang , Y B Chen , F A Harris , X P Xu , S G Wang , Zhi Gao , Kun Wang , J F Sun , G Felici , L Yang , S Nisar , J H Yin , C Morales Morales , S S Sun , M Bertani , K J Zhu , X Q Hao , J Z Bai , M H Ye , Q M Ma , K H Rashid , X C Lou , V Santoro , D P Jin , N Kalantarnayestanaki , L L Ma , M G Zhao , A Julin , D V Dedovich , F Nerling , J W Zhao , J M Bian , Kuncheng Li , Yangsu Zeng , D H Wei , M H Gu , J G Messchendorp , R G Ping , X Y Jiang , V Prasad , J Z Fan , N Yu Muchnoi , D H Zhang , J H Zou , Maria S Greco , E E Eren , Y F Liang , G R Liao , P Weidenkaff , X D Ruan , Z Wu , G S Huang , J V Bennett , Q J Xu , Wei Wang , P Patteri , X R Zhou , I Denysenko , T Johansson , W L Yuan , Y Gao , William P Kuhn , Chuntao Leng , I B Nikolaev , P Kiese , Guanxing Chen , W M Song , P Larin , S Schumann , J J Zhang , M Y Dong , X H Mo , Liyu Zhang , Q P Ji , J F Hu , B Kloss , G F Cao , S Spataro , Y Fang , S J Chen , X K Chu , M Ullrich , M Wolke , S L Niu , Xiang Yi Zhang , Y Ban , J P Dai , O B Kolcu , J G Lu , P X Shen , Xiao Liu , A A Zafar , B Kopf , Jintao Zhuang , Y N Zhang , X M Li , Kang Zhang , S Jin , M Lara , Yuan Yuan , Q L Xiu , Y X Yang , Z L Hou , G A Chelkov , Hui Cai , D Ambrose , F Feldbauer , M Fritsch , X L Zhu , Y K Heng , G X Sun , X R Lyu , F De Mori PHYSICS LETTERS B（2016）
摘要
We extract the e(+) e(-) -> pi(+) pi(-) 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 vertical bar F pi vertical bar(2) as well as the contribution of the measured cross section to the leading-order hadronic vacuum polarization contribution to (g - 2)(mu). We find this value to be a(mu)(pi pi,LO) (600-900 MeV) = (368.2 +/- 2.5(stat)+/- 3.3(sys)).10(-10), which is between the corresponding values using the BaBar or KLOE data. (C) 2015 The Authors. Published by Elsevier B.V.
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关键词
Hadronic cross section, Muon anomaly, Initial state radiation, Pion form factor, BESIII
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