First observation of $\Sigma^{-}-e^{-}$ elastic scattering in the hyperon beam experiment WA89 at CERN

First observation of $\Sigma^{-}-e^{-}$ elastic scattering in the hyperon beam experiment WA89 at CERN

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 o...

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Veröffentlicht in:The European physical journal. C, Particles and fields Particles and fields, 1999, Vol.8, p.59-66
Hauptverfasser: Adamovich, M.I., Aleksandrov, Yu.A., Barberis, D., Beck, M., Berat, C., Beusch, W., Boss, M., Brons, S., Brueckner, W., Buenerd, M., Busch, C., Buescher, C., Charignon, F., Chauvin, J., Chudakov, E.A., Dersch, U., Dropmann, F., Engelfried, J., Faller, F., Fournier, A., Gerasimov, S.G., Godbersen, M., Grafstrom, P., Haller, T., Heidrich, M., Hubbard, E., Hurst, R.B., Konigsmann, K., Konorov, I., Keller, N., Martens, K., Martin, P., Masciocchi, S., Michaels, R., Muller, U., Neeb, H., Newbold, D., Newsom, C., Paul, S., Pochodzalla, J., Potashnikova, I., Povh, B., Ransome, R.D., Ren, Zhuoxiang, Rey-Campagnolle, M., Rosner, G., Rossi, L., Rudolph, H., Scheel, C., Schmitt, L., Siebert, H.W., Simon, A., Smith, V.J., Thilmann, O., Trombini, A., Vesin, E., Volkemer, B., Vorwalter, K., Walcher, T., Walder, G., Werding, R., Wittmann, E., Zavertyaev, M.V.
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Sprache:eng
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High Energy Physics - Experiment
Physics
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Zusammenfassung: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 (Σ−)=0.91±0.32(stat.)±0.4 (syst.) fm2. This constitutes the first measurement of (Σ−) and demonstrates the possibility to also measure the charge radii of other hyperons. (Springer)
ISSN:1434-6044
1434-6052
DOI:10.1007/s100529901103