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HK: Fachverband Physik der Hadronen und Kerne
HK 24: Elektromagnetische und Hadronische Sonden
HK 24.6: Talk
Wednesday, March 14, 2007, 12:30–12:45, A
e+e− hadronic cross section measurement at DAΦNE with the KLOE detector — •paolo beltrame — IEKP - KIT Karlsruhe University, Postfach 3640, D-76021, Karlsruhe, Germany
At the Frascati φ-factory DAΦNE the pion form factor is measured by means of the ’radiative return’, i.e. by using events in which one of the collider electrons (positrons) has radiated an initial state radiation photon (ISR), lowering in such a way the invariant mass Mππ of the two-pion-system.
In a recent publication of the KLOE collaboration the initial state radiation photon had been required to be at small polar angles with respect to the beam axis, the so called ’Small Angle analysis’, using data collected in 2001.
We show an update of this analysis, using 2002 data. We also present results from a new and complementary analysis in which the photon is tagged at large polar angles. Only like this the threshold region Mππ2<0.35 GeV2 becomes accessible.