Observation of a resonance in the KSp decay channel at a mass of 1765∈MeV/c2

M. I. Adamovich, Y. A. Alexandrov, S. P. Baranov, 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. FallerA. Fournier, S. G. Gerassimov, M. Godbersen, P. Grafström, T. Haller, M. Heidrich, E. Hubbard, R. B. Hurst, K. Königsmann, I. Konorov, N. Keller, K. Martens, P. Martin, S. Masciocchi, R. Michaels, U. Müller, H. Neeb, D. Newbold, C. Newsom, S. Paul, J. Pochodzalla, I. Potashnikova, B. Povh, Z. Ren, M. Rey-Campagnolle, G. Rosner, L. Rossi, H. Rudolph, C. Scheel, L. Schmitt, H. W. Siebert, A. Simon, V. Smith, O. Thilmann, A. Trombini, E. Vesin, B. Volkemer, K. Vorwalter, T. Walcher, G. Wälder, R. Werding, E. Wittmann, M. V. Zavertyaev

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We report on the observation of a KSp resonance signal at a mass of 1765 ± 5 MeV/c 2, with intrinsic width Γ = 108 ± 22 MeV/c 2, produced inclusively in ∑-- nucleus interactions at 340 GeV/c in the hyperon beam experiment WA89 at CERN. The signal was observed in the kinematic region xF>0.7, in this region its production cross section rises approximately linearly with (1-x F), reaching BR(X→KSp)dσ/dxF=(5. 2±2.3)μb per nucleon at xF=0.8. The hard xF spectrum suggests the presence of a strong leading particle effect in the production and hence the identification as a ∑*+ state. No corresponding peaks were observed in the K-p and Λπ ± mass spectra.

Original languageEnglish
Article number535
Pages (from-to)535-538
Number of pages4
JournalEuropean Physical Journal C
Issue number3
StatePublished - Apr 2007


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