Bochum 1998 – scientific programme

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HK: Hadronen und Kerne

HK 11: Structure of Baryons, Mesons II

HK 11.1: Talk

Monday, March 16, 1998, 14:00–14:15, J

Measurement of hyperon charge radii at SELEX — •I. Eschrich, U. Dersch, I. Konorov, H. Krüger, B. Povh, J. Simon, and K. Vorwalter — 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.