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First measurement of the Λ→nγ branching ratio |
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| Authors: | S. F. Biagi M. Bourquin R. M. Brown H. J. Burckhart Ch. Doré P. Extermann M. Gailloud C. N. P. Gee W. M. Gibson R. J. Gray P. Jacot-Guillarmod P. W. Jeffreys W. C. Louis Th. Modis P. Mühlemann R. C. Owen J. Perrier K. J. S. Ragan Ph. Rosselet B. J. Saunders P. Schirato H. W. Siebert V. J. Smith K. -P. Streit J. J. Thresher R. Weill A. T. Wood C. Yanagisawa |
| Affiliation: | 1. Queen Mary College, University of London, E1 4NS, London, UK 3. University of Geneva, CH-1211, Geneva 4, Switzerland 4. Rutherford Appleton Laboratory, OX11 0QX, Chilton, Oxon, UK 5. Physikalisches Institut, Universit?t Heidelberg, Federal Republic of Germany 7. University of Lausanne, CH-1015, Lausanne, Switzerland 8. H.H. Wills Physics Laboratory, University of Bristol, BS8 1TL, Bristol, UK 6. CERN, CH-1211, Geneva 23, Switzerland |
| Abstract: | In an experiment performed at the CERN-SPS charged hyperon beam, we have observed the radiative decay Λ→nγ, using well identified Λ from the decays of Ο? of 116 GeV/c momentum. Neutrons and photons from the Λ decays were observed in liquid argon and lead glass detectors. From a sample of 31 candidates, containing an estimated background of 7.3 events, the decay branching ratio was measured to be Γ(Λ→nγ)/Γ(Λ→all)=(1.02±0.33)×10?3. |
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