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

Stefan E. Müller (KLOE collaboration)

doi:10.1088/1674-1137/34/6/013

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2024年10月30日

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_ππ between 0.1 and 0.85 GeV² with 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 0.12_ππ < 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 M²_ππ 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 Δa_μ^ππ=(478.5±2.0_stat±4.8_syst±2.9_theo)・10^－10 further confirms the discrepancy between the Standard Model evaluation for a_μ and 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 M²_ππ 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

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

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Measurement of the pion form factor for M²_ππ between 0.1 and 0.85 GeV² with the KLOE detector

Stefan E. Müller (KLOE collaboration)

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

Received Date: 2010-01-25
Accepted Date: 1900-01-01
Available Online: 2010-06-05

Abstract:

The KLOE experiment at the φ-factory DAΦNE has measured the pion form factor in the range between 0.12_ππ < 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 M²_ππ 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 Δa_μ^ππ=(478.5±2.0_stat±4.8_syst±2.9_theo)・10^－10 further confirms the discrepancy between the Standard Model evaluation for a_μ and the experimental value measured by the (g-2) collaboration at BNL.