Köln 2004 – wissenschaftliches Programm
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HK: Physik der Hadronen und Kerne
HK 3: Electromagnetic and Hadronic Probes I
HK 3.2: Gruppenbericht
Montag, 8. März 2004, 16:15–16:45, B
Measurement of σ(e+e−→ π+π−) with the KLOE detector — •Stefan E. Müller — Institut für Exp. Kernphysik Universität Karlsruhe, Postfach 3640, 76021 Karlsruhe
The KLOE detector at the DAΦNE φ-facility is in operation since 1999 and has accumulated ca. 500 pb−1 of data. The program of the KLOE detector covers a wide spectrum of physics. Especially the measurement of hadronic cross sections below an energy of 1 GeV receives much interest, since the precise determination of these quantities helps to lower the uncertainty on the theoretical evaluation of the hadronic contribution to the muon anomalous magnetic moment.
The measurement at the φ-factory DAΦNE with its energy fixed to the mass of the φ meson is carried out by selecting events in which the e+ or the e− emitts a photon in the initial state before colliding. This No-dqradiative returnNo-dq to the ρ and ω resonances allows to scan the energy region from the φ resonance down to the hadron production threshold.
The method of the measurement as well as results on σ(e+e−→ π+π−) based on data taken in 2001 will be presented in the talk. Special concern will be given to the treatment of events with final state radiation.