Measurement of the pion form factor for M2ππ between 0.1 and 0.85 GeV2 with the KLOE detector

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Stefan E. Müller (KLOE collaboration). Measurement of the pion form factor for M2ππ between 0.1 and 0.85 GeV2 with the KLOE detector[J]. Chinese Physics C, 2010, 34(6): 686-691. doi: 10.1088/1674-1137/34/6/013
Stefan E. Müller (KLOE collaboration). Measurement of the pion form factor for M2ππ between 0.1 and 0.85 GeV2 with the KLOE detector[J]. Chinese Physics C, 2010, 34(6): 686-691.  doi: 10.1088/1674-1137/34/6/013 shu
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Received: 2010-01-25
Revised: 1900-01-01
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Measurement of the pion form factor for M2ππ between 0.1 and 0.85 GeV2 with the KLOE detector

  • Institut für Kernphysik, Johannes Gutenberg-Universität, Johann-Joachim-Becher-Weg 45, 55128 Mainz, Germany

Abstract: 

The KLOE experiment at the φ-factory DAΦNE has measured the pion form factor in the range between 0.12ππ < 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 M2ππ 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 Δaμππ=(478.5±2.0stat±4.8syst±2.9theo)&#12539;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.

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