Measurement of the properties of the Ω̄+ and Ω- hyperons

A. W. Chan, D. K.C. Cheng, K. B. Luk, C. James, R. Rameika, P. M. Ho, M. J. Longo, A. Nguyen, J. Duryea, G. Guglielmo, K. Heller, K. Johns, H. T. Diehl, S. Teige, G. B. Thomson, Y. Zou

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We have analyzed Ω̄+ and Ω- events produced in the inclusive reaction p + Be → Ω + X and have measured some properties of the Ω̄+ and Ω- hyperons via the decay Ω → ΛK → pπK. The measured Ω̄+ + lifetime was τΩ̄ = (0.823±0.038) × 10-10 s (χ2/NDF = 1.52). and the measured decay parameter was αΩ̄ = 0.017 ± 0.077 (χ2/NDF = 1.74). The corresponding values for the Ω- were τΩ = (0.817±0.022) × 10-10 s (χ2/NDF = 1.17) and αΩ = -0.028±0.047 (χ2/NDF = 1.49). In addition, the measurement of the normalized mass difference between the Ω̄+ and Ω- yielded ΔMΩ/MΩ = (1.44±7.98) × 10-5. The measurements were all in good agreement with CPT invariance.

Original languageEnglish (US)
JournalPhysical Review D - Particles, Fields, Gravitation and Cosmology
Issue number7
StatePublished - Oct 1 1998


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