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

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DOI Доступ к ресурсу на сайте издателя			10.1016/j.physletb.2015.11.043

Title: Measurement of the e+e− → π+π− cross section between 600 and 900 MeV using initial state radiation
Creator: Ablikim, M.
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Ai, X. C.
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Chelkov, G. A.
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Achasov, M. N.
Date: 2016
DOI: 10.1016/j.physletb.2015.11.043
Description: We extract the e+e−→π+π−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−12.93 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|Fπ|2 as well as the contribution of the measured cross section to the leading-order hadronic vacuum polarization contribution to (g−2)μ(g−2)μ. We find this value to be View the MathML sourceaμππ,LO(600–900MeV)=(368.2±2.5stat±3.3sys)⋅10−10, which is between the corresponding values using the BaBar or KLOE data.

Created: 05-07-2017

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