| Article | |
| Report number | hep-ex/0702044 |
| Title | Observation of a resonance in the K$_s$p decay channel at a mass of 1765 MeV/c$^2$ |
| Author(s) |
Adamovich, M.I. (Lebedev Inst.) ; Alexandrov, Y.A. (Lebedev Inst.) ; Baranov, S.P. (Lebedev Inst.) ; Barberis, D. (Genoa U. ; INFN, Genoa) ; Beck, M. (Heidelberg, Max Planck Inst.) ; Bérat, C. (U. Grenoble Alpes) ; Beusch, W. (CERN) ; Boss, M. (Heidelberg U.) ; Brons, S. (Heidelberg, Max Planck Inst. ; TRIUMF) ; Brückner, W. (Heidelberg, Max Planck Inst.) ; Buénerd, M. (U. Grenoble Alpes) ; Busch, C. (Heidelberg U.) ; Büscher, C. (Heidelberg, Max Planck Inst.) ; Charignon, F. (U. Grenoble Alpes) ; Chauvin, J. (U. Grenoble Alpes) ; Chudakov, E.A. (Heidelberg U.) ; Dersch, U. (Heidelberg, Max Planck Inst.) ; Dropmann, F. (Heidelberg, Max Planck Inst.) ; Engelfried, J. (Heidelberg U. ; San Luis Potosi U.) ; Faller, F. (Heidelberg U.) ; Fournier, A. (U. Grenoble Alpes) ; Gerassimov, S.G. (Lebedev Inst. ; Heidelberg, Max Planck Inst. ; Tech. U., Munich (main)) ; Godbersen, M. (Heidelberg, Max Planck Inst.) ; Grafström, P. (CERN) ; Haller, T. (Heidelberg, Max Planck Inst.) ; Heidrich, M. (Heidelberg, Max Planck Inst.) ; Hubbard, E. (Heidelberg, Max Planck Inst.) ; Hurst, R.B. (Genoa U. ; INFN, Genoa) ; Königsmann, K. (Heidelberg, Max Planck Inst. ; Freiburg U.) ; Konorov, I. (Lebedev Inst. ; Heidelberg, Max Planck Inst. ; Tech. U., Munich (main)) ; Keller, N. (Heidelberg U.) ; Martens, K. (Heidelberg U. ; Utah U.) ; Martin, P. (U. Grenoble Alpes) ; Masciocchi, S. (Heidelberg, Max Planck Inst. ; Darmstadt, GSI) ; Michaels, R. (Heidelberg, Max Planck Inst.) ; Müller, U. (Mainz U.) ; Neeb, H. (Heidelberg, Max Planck Inst.) ; Newbold, D. (Bristol U.) ; Newsom, C. (Iowa U.) ; Paul, S. (Heidelberg, Max Planck Inst. ; Tech. U., Munich (main)) ; Pochodzalla, J. (Heidelberg, Max Planck Inst. ; Mainz U.) ; Potashnikova, I. (Heidelberg, Max Planck Inst.) ; Povh, B. (Heidelberg, Max Planck Inst.) ; Ren, Z. (Heidelberg, Max Planck Inst.) ; Rey-Campagnolle, M. (U. Grenoble Alpes) ; Rosner, G. (Mainz U. ; Glasgow U.) ; Rossi, L. (Genoa U. ; INFN, Genoa) ; Rudolph, H. (Mainz U.) ; Scheel, C. (Nikhef, Amsterdam) ; Schmitt, L. (Mainz U. ; Darmstadt, GSI) ; Siebert, H.W. (Heidelberg U. ; Mainz U.) ; Simon, A. (Heidelberg U. ; Freiburg U.) ; Smith, V. (Bristol U.) ; Thilmann, O. (Heidelberg U.) ; Trombini, A. (Heidelberg, Max Planck Inst.) ; Vesin, E. (U. Grenoble Alpes) ; Volkemer, B. (Mainz U.) ; Vorwalter, K. (Heidelberg, Max Planck Inst.) ; Walcher, T. (Mainz U.) ; Wälder, G. (Heidelberg U.) ; Werding, R. (Heidelberg, Max Planck Inst.) ; Wittmann, E. (Heidelberg, Max Planck Inst.) ; Zavertyaev, M.V. (Lebedev Inst.) |
| Publication | 2007 |
| Imprint | 27 Feb 2007 |
| Number of pages | 5 |
| In: | Eur. Phys. J. C 50 (2007) 535-538 |
| DOI | 10.1140/epjc/s10052-007-0284-9 |
| Subject category | Particle Physics - Experiment |
| Accelerator/Facility, Experiment | CERN SPS ; WA89 |
| Abstract | We report on the observation of a K$_s$p resonance signal at a mass of 1765$\pm$5 MeV/c$^2$, with intrinsic width $\Gamma = 108\pm 22$ MeV/c$^2$, produced inclusively in $\Sigma^-$-nucleus interactions at 340 GeV/c in the hyperon beam experiment WA89 at CERN. The signal was observed in the kinematic region $x_F>0.7$, in this region its production cross section rises approximately linearly with $(1-x_F)$, reaching $BR(X\to K_S p)\cdot d\sigma /dx_F = (5.2\pm 2.3) \mu b $ per nucleon at $x_F=0.8$. The hard \xf spectrum suggests the presence of a strong leading particle effect in the production and hence the identification as a $\Sigma^{*+}$ state. No corresponding peaks were observed in the $K^- p$ and $\Lambda \pi^{\pm}$ mass spectra. |
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