We have measured the ratio σ(e+e-→π+π-γ)/σ(e+e-→μ+μ-γ), with the KLOE detector at DAΦNE for a total integrated luminosity of ~240 pb-1. From this ratio we obtain the cross section σ(e+e-→π+π-). From the cross section we determine the pion form factor |Fπ|2 and the two-pion contribution to the muon anomaly aμ for 0.592<Mππ<0.975 GeV, δππaμ=(385.1±1.1stat±2.7sys+theo)×10-10. This result confirms the current discrepancy between the Standard Model calculation and the experimental measurement of the muon anomaly.

Precision measurement of σ(e+e-→π+π-γ)/σ(e+e-→μ+μ-γ) and determination of the π+π- contribution to the muon anomaly with the KLOE detector

ERRIQUEZ, Onofrio;
2013

Abstract

We have measured the ratio σ(e+e-→π+π-γ)/σ(e+e-→μ+μ-γ), with the KLOE detector at DAΦNE for a total integrated luminosity of ~240 pb-1. From this ratio we obtain the cross section σ(e+e-→π+π-). From the cross section we determine the pion form factor |Fπ|2 and the two-pion contribution to the muon anomaly aμ for 0.592
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Utilizza questo identificativo per citare o creare un link a questo documento: http://hdl.handle.net/11586/145549
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