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First observation ofΩ * resonances |
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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 T. Modis R. C. Owen J. Perrier K. J. 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, E14NS, London, UK 3. Université de Genève, CH-1211, Geneva, Switzerland 4. Rutherford Appleton Laboratory, Chiton, OX11 0QX, Didcot, UK 5. Physikalisches Institut, Universit?t Heidelberg, D-6900, Heidelberg, Federal Republic of Germany 7. Université de Lausane, CH-1015, Lausane, Switzerland 9. H.H. Wills Physics Laboratory, University of Bristol, B58 1TL, Bristols, UK 6. CERN, CH-1211, Genèva 23, Switzerland |
| Abstract: | In a experiment at the CERN SPS charged hyperon beam using incident Ξ?, we have obtained evidence for the production of two Ω* resonances decaying into Ξ?π+ K ?, with the following parameters:M 1=2251±12,Γ 1=48±20 MeV/c2, 78 ±23 events, andM 2=2284±12,Γ 2=26±23 MeV/c2 45±10 events. The first state is also observed as a 4.2σ effect in a subsample which contains an additionalK + orK 0 in the final state. Production cross sections and branching ratios to Ξ* K ? and Ξ? K * are presented. |
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