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HK: Fachverband Hadronen und Kerne
HK 74: Fundamental Symmetries
HK 74.5: Talk
Thursday, March 19, 2009, 17:45–18:00, H-ZO 70
Pion form factor measurements at KLOE via Radiative Return method — •Paolo Beltrame — Institut für Kernphysik, J.Gutenberg Universität Mainz, J-J-Becher-Weg, 45 55099 Mainz
The KLOE experiment at the φ factory DAΦNE is using ISR to measure σ(e+e−→π+π−γ) with an absolute normalisation obtained from Bhabha scattering.
ππγ events are obtained with two different selection criteria: (a) requiring photon emission at small angles (SA) (b) tagged photons detected in the calorimeter (LA). With the two samples we cover the complete range of 2mπ <√s′ = Mππ < mφ. Using a theoretical radiator function H(s) we extract the pion form factor |Fπ|2 and obtain the two-pion contribution to aµhad. Results to be presented come from the analysis of 240 pb−1 collected in 2002, with very small statistical error (∼0.1%) and improved systematic uncertainties (∼1%).
Furthermore, using a run of 200 pb−1 of data taken at √s=1 GeV, we can minimize the contribution of resonant background processes.