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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12 Scopus citations


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)
Article number072002
Pages (from-to)720021-7200212
Number of pages6480192
JournalPhysical Review D - Particles, Fields, Gravitation and Cosmology
Issue number7
StatePublished - Oct 1 1998

ASJC Scopus subject areas

  • Physics and Astronomy (miscellaneous)


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