Freiburg 1998 – scientific programme

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T: Teilchenphysik

T 609: Hyperonen

T 609.1: Talk

Thursday, March 26, 1998, 08:30–08:45, HS J

Measurement of hyperon charge radii at SELEX — •K. Vorwalter, U. Dersch, I. Eschrich, I. Konorov, H. Krüger, B. Povh, and J. Simon — Max-Planck Institut für Kernphysik, Saupfercheckweg 1, 69117 Heidelberg
The 650 GeV/c high-intensity hyperon beam at Fermilab provides an excellent possibility to measure the charge radii of Σ⁻, π⁻, p, Ξ⁻, and Σ⁺ by elastic scattering of beam particles on shell electrons in a carbon target. During the 1997 run of the Selex/E781 experiment we have implemented a dedicated trigger and an online filter in the standard Selex charm setup and recorded more than 200 million elastic hadron-electron scattering events. The analysis is currently focusing on the Σ⁻ and π⁻ radii. Event selection, data stripping, and acceptance corrections are described and first results presented.