First observation of Σ--e- elastic scattering in the hyperon beam experiment WA89 at CERN
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We have investigated the elastic scattering of high energy Σ- off electrons from carbon and copper targets using the CERN hyperon beam. Scattering events are identified using a maximum likelihood technique exploring the kinematical relations of the scattered particles. The observed Q2-distribution of these events suggests a mean square charge radius of the Σ- of < r2ch > (Σ-) = 0.91 ± 0.32(stat.) ± 0.4 (syst.) fm2. This constitutes the first measurement of < r2ch > (Σ-) and demonstrates the possibility to also measure the charge radii of other hyperons.
