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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 |
| Institution: | 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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