First observation of Σ--e- elastic scattering in the hyperon beam experiment WA89 at CERN

M. I. Adamovich, Yu A. Alexandrov, D. Barberis, M. Beck, C. Bérat, W. Beusch, M. Boss, S. Brons, W. Brückner, M. Buénerd, C. Busch, C. Büscher, F. Charignon, J. Chauvin, E. A. Chudakov, U. Dersch, F. Dropmann, J. Engelfried, F. Faller, A. FournierS. G. Gerassimov, M. Godbersen, P. Grafström, Th Haller, M. Heidrich, E. Hubbard, R. B. Hurst, K. Königsmann, I. Konorov, N. Keller, K. Martens, Ph Martin, S. Masciocchi, R. Michaels, U. Müller, H. Neeb, D. Newbold, C. Newsom, S. Paul, J. Pochodzalla, I. Potashnikova, B. Povh, R. D. Ransome, Z. Ren, M. Rey-Campagnolle, G. Rosner, L. Rossi, H. Rudolph, C. Scheel, L. Schmitt, H. W. Siebert, A. Simon, V. J. Smith, O. Thilmann, A. Trombini, E. Vesin, B. Volkemer, K. Vorwalter, Th Walcher, G. Wälder, R. Werding, E. Wittmann, M. V. Zavertyaev

Research output: Contribution to journalArticlepeer-review

14 Scopus citations


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.

Original languageEnglish
Pages (from-to)59-66
Number of pages8
JournalEuropean Physical Journal C
Issue number1
StatePublished - 1999
Externally publishedYes


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