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First measurement of the (Ξ−→∑−γ)/(Ξ−→Λπ−) branching ratio

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Zeitschrift für Physik C Particles and Fields

Abstract

In an experiment performed at the CERN SPS charged hyperon beam, we have observed the radiative decay Ξ−→∑−γ. From a sample of 11 candidates, containing an estimated background of 1.6 events, the branching ratio is found to be:

$$\Gamma (\Xi ^ - \to \Sigma ^ - \gamma )/(\Xi ^ - \to \Lambda \pi ^ - ) = (2.3 \pm 1.0) \times 10^{ - 4} .$$

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Author information

Author notes

  1. S. F. Biagi

    Present address: University of Liverpool, UK

  2. H. J. Burckhart

    Present address: CERN, Geneva, Switzerland

  3. W. C. Louis

    Present address: Princeton University, NJ, USA

  4. P. Mühlemann

    Present address: Zellweger-Uster, Hombrechtikon, Switzerland

  5. P. Schirato

    Present address: Hôpital Cantonal Universitaire, Geneva, Switzerland

  6. K. -P. Streit

    Present address: Physikalisches Institut, Universität Heidelberg, FRG

  7. C. Yanagisawa

    Present address: State University of New York at Stony Brook, NY, USA

Authors and Affiliations

  1. H. H. Wills Physics Laboratory, University of Bristol, BS8, 1TL, Bristol, UK

    W. M. Gibson, R. C. Owen, V. J. Smith & A. T. Wood

  2. CERN, CH-1211, Geneva, Switzerland

    K. -P. Streit

  3. Université de Genève, CH-1200, Geneva, Switzerland

    M. Bourquin, P. Extermann, P. Mühlemann, J. Perrier, K. J. S. Ragan & P. Schirato

  4. Physikalisches Institut, Universität Heidelberg, D-6900, Heidelberg, Federal Republic of Germany

    H. J. Burckhart & H. W. Siebert

  5. Université de Lausanne, CH-1015, Lausanne, Switzerland

    Ch. Doré, M. Gailloud, P. Jacot-Guillarmod, Ph. Rosselet & R. Weill

  6. Queen Mary College, University of London, E1 4NS, London, UK

    S. F. Biagi

  7. Rutherford Appleton Laboratory, Chilton, OX11 0QX, Didcot, UK

    R. M. Brown, C. N. P. Gee, R. J. Gray, P. W. Jeffreys, W. C. Louis, B. J. Saunders, J. J. Thresher & C. Yanagisawa

Authors
  1. S. F. Biagi
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  2. M. Bourquin
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  3. R. M. Brown
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  4. H. J. Burckhart
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  5. Ch. Doré
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  6. P. Extermann
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  7. M. Gailloud
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  8. C. N. P. Gee
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  9. W. M. Gibson
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  10. R. J. Gray
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  11. P. Jacot-Guillarmod
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  12. P. W. Jeffreys
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  13. W. C. Louis
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  14. P. Mühlemann
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  15. R. C. Owen
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  16. J. Perrier
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  17. K. J. S. Ragan
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  18. Ph. Rosselet
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  19. B. J. Saunders
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  20. P. Schirato
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  21. H. W. Siebert
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  22. V. J. Smith
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  23. K. -P. Streit
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  24. J. J. Thresher
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  25. R. Weill
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  26. A. T. Wood
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  27. C. Yanagisawa
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Additional information

Work supported in part by the UK Science and Engineering Research Council, the Swiss National Foundation for Scientific Research and the Bundesministerium für Forschung und Technologie, Federal Republic of Germany

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Biagi, S.F., Bourquin, M., Brown, R.M. et al. First measurement of the (Ξ−→∑−γ)/(Ξ−→Λπ−) branching ratio. Z. Phys. C - Particles and Fields 35, 143–150 (1987). https://doi.org/10.1007/BF01408442

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  • DOI: https://doi.org/10.1007/BF01408442

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