Measurement of the e+e-→π+π-cross section between 600 and 900 MeV using initial state radiation
- 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.2015.11.043Abstract
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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