Chinese Physics C > 2010, Vol. 34 > Issue(6): 686-691 DOI: 10.1088/1674-1137/34/6/013

Measurement of the pion form factor for M²_ππbetween 0.1 and 0.85 GeV²with the KLOE detector

Stefan E. Müller (KLOE collaboration)

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

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Abstract：

The KLOE experiment at the φ-factory DAΦNE has measured the pion form factor in the range between 0.1 2 _ππ< 0.85 GeV ²using events taken at √s= 1 GeV with a photon emitted at large polar angles in the initial state. This measurement extends the M ² _ππregion 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 Δa _μ ^ππ=(478.5±2.0 _stat±4.8 _syst±2.9 _theo) ・10 ^－10further confirms the discrepancy between the Standard Model evaluation for a _μand the experimental value measured by the (g-2) collaboration at BNL.

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Stefan E. Müller (KLOE collaboration). Measurement of the pion form factor for M ² _ππbetween 0.1 and 0.85 GeV ²with the KLOE detector[J]. Chinese Physics C, 2010, 34(6): 686-691. doi: 10.1088/1674-1137/34/6/013

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Received: 2010-01-25
Revised: 1900-01-01

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