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

  • Author(s): Ablikim, M;
  • Achasov, MN;
  • Adlarson, P;
  • Ahmed, S;
  • Albrecht, M;
  • Aliberti, R;
  • Amoroso, A;
  • An, MR;
  • An, Q;
  • Bai, XH;
  • Bai, Y;
  • Bakina, O;
  • Ferroli, RB;
  • Balossino, I;
  • Ban, Y;
  • Begzsuren, K;
  • Berger, N;
  • Bertani, M;
  • Bettoni, D;
  • Bianchi, F;
  • Bloms, J;
  • Bortone, A;
  • Boyko, I;
  • Briere, RA;
  • Cai, H;
  • Cai, X;
  • Calcaterra, A;
  • Cao, GF;
  • Cao, N;
  • Cetin, SA;
  • Chang, JF;
  • Chang, WL;
  • Chelkov, G;
  • Chen, DY;
  • Chen, G;
  • Chen, HS;
  • Chen, ML;
  • Chen, SJ;
  • Chen, XR;
  • Chen, YB;
  • Chen, ZJ;
  • Cheng, WS;
  • Cibinetto, G;
  • Cossio, F;
  • Cui, XF;
  • Dai, HL;
  • Dai, XC;
  • Dbeyssi, A;
  • De Boer, RE;
  • Dedovich, D;
  • Deng, ZY;
  • Denig, A;
  • Denysenko, I;
  • Destefanis, M;
  • De Mori, F;
  • Ding, Y;
  • Dong, C;
  • Dong, J;
  • Dong, LY;
  • Dong, MY;
  • Dong, X;
  • Du, SX;
  • Fan, YL;
  • Fang, J;
  • Fang, SS;
  • Fang, Y;
  • Farinelli, R;
  • Fava, L;
  • Feldbauer, F;
  • Felici, G;
  • Feng, CQ;
  • Feng, JH;
  • Fritsch, M;
  • Fu, CD;
  • Gao, Y;
  • Gao, YG;
  • Garzia, I;
  • Liu, Z;
  • Ge, PT;
  • Geng, C;
  • Gersabeck, EM;
  • Gilman, A;
  • Goetzen, K;
  • Gong, L;
  • Gong, WX;
  • Gradl, W;
  • Greco, M;
  • Gu, LM;
  • Gu, MH;
  • Gu, S;
  • Gu, YT;
  • Guan, CY;
  • Guo, AQ;
  • Guo, LB;
  • Guo, RP;
  • Guo, YP;
  • Guskov, A;
  • Han, TT;
  • Han, WY;
  • Hao, XQ
  • et al.

Published Web Location

http://doi.org/10.1016/j.physletb.2015.11.043
No 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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