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

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Abstract

We report on the observation of a KSp resonance signal at a mass of 1765 ± 5 MeV/c 2, with intrinsic width Γがんま = 108 ± 22 MeV/c 2, produced inclusively in Σしぐま--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-xF), reaching BR(X→KSp)dσしぐま/dxF=(5.2±2.3)μみゅーb 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 Σしぐま*+ state. No corresponding peaks were observed in the K-p and Λらむだπぱい± mass spectra.

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Authors and Affiliations

  1. Moscow Lebedev Physics Institute, 117924, Moscow, Russia

    M.I. Adamovich, Y.A. Alexandrov, S.P. Baranov, S.G. Gerassimov, I. Konorov & M.V. Zavertyaev

  2. Dipartimento di Fisica and I.N.F.N, Sezione di Genova, 16146, Genova, Italy

    D. Barberis, R.B. Hurst & L. Rossi

  3. Max-Planck-Institut für Kernphysik Heidelberg, 69029, Heidelberg, Germany

    M. Beck, S. Brons, W. Brückner, C. Büscher, U. Dersch, F. Dropmann, S.G. Gerassimov, M. Godbersen, T. Haller, M. Heidrich, E. Hubbard, K. Königsmann, I. Konorov, S. Masciocchi, R. Michaels, H. Neeb, S. Paul, J. Pochodzalla, I. Potashnikova, B. Povh, Z. Ren, A. Trombini, K. Vorwalter, R. Werding & E. Wittmann

  4. Institut des Sciences Nucléaires, Université de Grenoble, 38026, Grenoble Cedex, France

    C. Bérat, M. Buénerd, F. Charignon, J. Chauvin, A. Fournier, P. Martin, M. Rey-Campagnolle & E. Vesin

  5. CERN, 1211, Genève 23, Switzerland

    W. Beusch & P. Grafström

  6. Physikalisches Institut, Universität Heidelberg, 69120, Heidelberg, Germany

    M. Boss, C. Busch, E.A. Chudakov, J. Engelfried, F. Faller, N. Keller, K. Martens, H.-W. Siebert, A. Simon, O. Thilmann & G. Wälder

  7. Institut für Kernphysik, Johannes Gutenberg-Universität Mainz, Johann-Joachim-Becher-Weg 45, 55099, Mainz, Germany

    U. Müller, J. Pochodzalla, G. Rosner, H. Rudolph, L. Schmitt, H.-W. Siebert, B. Volkemer & T. Walcher

  8. University of Bristol, Bristol, BS8 1TL, UK

    D. Newbold & V. Smith

  9. TRIUMF, Vancouver, B.C., V6T 2A3, Canada

    S. Brons

  10. Thomas Jefferson Lab, Newport News, VA, 23606, USA

    E.A. Chudakov & R. Michaels

  11. Instituto de Fisica, Universidad Autonoma de San Luis Potosi, San Luis Potosi, 78240, Mexico

    J. Engelfried

  12. Fraunhofer Institut für Solare Energiesysteme, 79100, Freiburg, Germany

    F. Faller

  13. Physik Department E18, Technische Universität München, 85747, Garching, Germany

    S.G. Gerassimov, I. Konorov & S. Paul

  14. Fakultät für Physik, Universität Freiburg, Freiburg, Germany

    K. Königsmann & A. Simon

  15. Department of Physics, University of Utah, Salt Lake City, Utah, USA

    K. Martens

  16. Gesellschaft für Schwerionenforschung, 64291, Darmstadt, Germany

    S. Masciocchi & L. Schmitt

  17. University of Iowa, Iowa City, Iowa, 52242, USA

    C. Newsom

  18. Department of Physics and Astronomy, University of Glasgow, Glasgow, G12 8QQ, UK

    G. Rosner

  19. NIKHEF, 1009 D8, Amsterdam, The Netherlands

    C. Scheel

Authors
  1. M.I. Adamovich
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  2. Y.A. Alexandrov
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  3. S.P. Baranov
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  4. D. Barberis
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  5. M. Beck
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  6. C. Bérat
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  7. W. Beusch
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  8. M. Boss
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  9. S. Brons
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  10. W. Brückner
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  11. M. Buénerd
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  12. C. Busch
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  13. C. Büscher
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  14. F. Charignon
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  15. J. Chauvin
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  16. E.A. Chudakov
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  17. U. Dersch
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  18. F. Dropmann
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  19. J. Engelfried
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  20. F. Faller
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  21. A. Fournier
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  22. S.G. Gerassimov
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  23. M. Godbersen
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  24. P. Grafström
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  25. T. Haller
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  26. M. Heidrich
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  27. E. Hubbard
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  28. R.B. Hurst
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  29. K. Königsmann
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  30. I. Konorov
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  31. N. Keller
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  32. K. Martens
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  33. P. Martin
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  34. S. Masciocchi
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  35. R. Michaels
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  36. U. Müller
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  37. H. Neeb
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  38. D. Newbold
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  39. C. Newsom
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  40. S. Paul
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  41. J. Pochodzalla
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  42. I. Potashnikova
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  43. B. Povh
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  44. Z. Ren
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  45. M. Rey-Campagnolle
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  46. G. Rosner
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  47. L. Rossi
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  48. H. Rudolph
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  49. C. Scheel
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  50. L. Schmitt
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  51. H.-W. Siebert
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  52. A. Simon
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  53. V. Smith
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  54. O. Thilmann
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  55. A. Trombini
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  56. E. Vesin
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  57. B. Volkemer
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  58. K. Vorwalter
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  59. T. Walcher
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  60. G. Wälder
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  61. R. Werding
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  62. E. Wittmann
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  63. M.V. Zavertyaev
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Consortia

The WA89 Collaboration

Corresponding author

Correspondence to J. Pochodzalla.

Additional information

PACS

25.80.-e; 13.60.Rj; 14.20.Jn

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Adamovich, M., Alexandrov, Y., Baranov, S. et al. Observation of a resonance in the KSp decay channel at a mass of 1765 MeV/c2 . Eur. Phys. J. C 50, 535–538 (2007). https://doi.org/10.1140/epjc/s10052-007-0284-9

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  • DOI: https://doi.org/10.1140/epjc/s10052-007-0284-9

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