Measurement of the pion form factor for M2ππ between 0.1 and 0.85 GeV2 with the KLOE detector
The KLOE experiment at the φ-factory DAφNE has measured the pion form factor in the range between 0.1 < Mππ2< 0.85 GeV2 using events taken at √s=1 GeV with a photon emitted at large polar angles in the initial state. This measurement extends the Mππ2 region covered by KLOE ISR measurements of the pion form factor down to the two pion production threshold. The value obtained in this measurement of the dipion contribution to the muon anomalous magnetic moment of △aμππ=(478.5±2.0stat±4.8syst±2.9theo)·10-10 further confirms the discrepancy between the Standard Model evaluation for aμ and the experimental value measured by the (g-2) collaboration at BNL.
hadronic cross section initial state radiation pion form factor muon anomaly
Stefan E.Müller
Institut fur Kernphysik,Johannes Gutenberg-Universitat,Johann-Joachim-Becher-Weg 45,55128 Mainz,Germany
国际会议
北京
英文
686-691
2009-10-13（万方平台首次上网日期，不代表论文的发表时间）