Aachen T 2003 – wissenschaftliches Programm

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T: Teilchenphysik

T 108: Test des Standardmodells I

T 108.6: Vortrag

Montag, 10. März 2003, 17:30–17:45, SFO11

Hadronic cross section measurement 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. Since this time ca. 500pb⁻¹ of data were collected. The analysis of this data cover a wide spectrum of physics. Of special interest is the measurement of hadronic cross sections below 1.02 GeV, since the precise determination of these quantities can help to lower the uncertainty of the theoretical calculations for the hadronic contribution to the anomalous magnetic moment of the muon. Due to the fact that DAΦNE is working at the fixed energy of the φ-resonance, the measurement is performed by selecting events in which the e⁺ or the e⁻ emits a hard photon before colliding. This “radiative return” allows to scan the energy region from the φ-resonance down to the two pion threshold.

In the talk the method of the measurement and preliminary results on dσ(e⁺e⁻→π⁺π⁻γ)/dM_ππ² and σ(e⁺e⁻→π⁺π⁻) based on data taken in 2001 will be presented.