Observation of the decay Ω0c → Ω-e+ve

R. Ammar,D. Besson,X. Zhao,S. Anderson,V. V. Frolov,Y. Kubota,S. J. Lee,S. Z. Li,R. Poling,A. Smith, C. J. Stepaniak,J. Urheim,S. Ahmed,M. S. Alam,L. Jian,M. Saleem,F. Wappler,E. Eckhart,K. K. Gan,C. Gwon,T. Hart,K. Honscheid,D. Hufnagel,H. Kagan, R. Kass,T. K. Pedlar,J. B. Thayer,E. Von Toerne,T. Wilksen,M. M. Zoeller,H. Muramatsu,S. J. Richichi, H. Severini, P. Skubic,S. A. Dytman,S. Nam, V. Savinov,S. Chen,J. W. Hinson,J. Lee,D. H. Miller, V. Pavlunin,E. I. Shibata, I. P. J. Shipsey, D. Cronin-Hennessy,A. L. Lyon,C. S. Park, W. Park,E. H. Thorndike,T. E. Coan,Y. S. Gao, E. Liu, Y. Maravin,I. Narsky, R. Stroynowski, M. Artuso, C. Boulahouache, K. Bukin, E. Dambasuren, R. Mountain

Physical Review Letters（2002）

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摘要

Using the CLEO detector at the Cornell Electron Storage Ring we have observed the Ω 0 c (css ground state) in the decay Ω 0 c → Ω - e + v e . We find a signal of 11.4 ′ 3.8(stat) events. The probability that we have observeda background fluctuation is 7.6 × 10 - 5 . We measure B(Ω 0 c → Ω - e + v e ). σ( e + e - → Ω 0 c X) = (42.2 ′ 14.1(stat) ′ 5.7(syst)) fb and R = = 00.41 ′ 0.19(stat) ′ 0.04(syst). This is the first statistically significant observation of an individual decay mode of the Ω 0 c in e + e - annihilation and the first example of a baryon decaying via β emission, where no quarks from the first generation participate in the reaction.

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