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HK: Physik der Hadronen und Kerne

HK 46: Electromagnetic and Hadronic Probes VI

HK 46.2: Gruppenbericht

Donnerstag, 14. März 2002, 16:30–17:00, D

Measurement of hadronic cross sections with the KLOE experiment in Frascati — •Stefan E. Müller — Institut für Exp. Kernphysik Universität Karlsruhe, Postfach 3640, 76021 Karlsruhe

The KLOE experiment at the Frascati e⁺e⁻ collider DAΦNE working at the φ(1.02 GeV) resonance started data taking in 1999. Although optimized to study neutral kaons, the KLOE detector is suited to cover a much wider field of physics. Especially appealing is the measurement of hadronic cross sections from 1.02 GeV down to the two pion threshold. The precise determination of these cross sections can be used to lower the uncertainty of the theoretical calculations for the hadronic contribution to the muon’s anomalous magnetic moment. Since DAΦNE is working at a fixed energy, the measurement is done by selecting events where the e⁺ or the e⁻ emits a hard photon. In this way the collision energy of the electron and the positron is lowered. The method of the measurement is presented in detail and first results for σ(e⁺e⁻→π⁺π⁻) are shown. In addition further recent results from the KLOE physics program are presented.