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

doi:10.1103/PhysRevD.58.072002

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

Physics and Astronomy (Twin Cities)

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Abstract

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 τ_Ω̄ = (0.823±0.038) × 10^-10 s (χ²/N_DF = 1.52). and the measured decay parameter was α_Ω̄ = 0.017 ± 0.077 (χ²/N_DF = 1.74). The corresponding values for the Ω^- were τ_Ω = (0.817±0.022) × 10^-10 s (χ²/N_DF = 1.17) and αΩ = -0.028±0.047 (χ²/N_DF = 1.49). In addition, the measurement of the normalized mass difference between the Ω̄⁺ and Ω^- yielded ΔM_Ω/M_Ω = (1.44±7.98) × 10^-5. The measurements were all in good agreement with CPT invariance.

Original language	English (US)
Article number	072002
Pages (from-to)	720021-7200212
Number of pages	6480192
Journal	Physical Review D - Particles, Fields, Gravitation and Cosmology
Volume	58
Issue number	7
DOIs	https://doi.org/10.1103/PhysRevD.58.072002
State	Published - Oct 1 1998

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Chan, A. W., Cheng, D. K. C., Luk, K. B., James, C., Rameika, R., Ho, P. M., Longo, M. J., Nguyen, A., Duryea, J., Guglielmo, G., Heller, K., Johns, K., Diehl, H. T., Teige, S., Thomson, G. B., & Zou, Y. (1998). Measurement of the properties of the Ω̄⁺ and Ω^- hyperons. Physical Review D - Particles, Fields, Gravitation and Cosmology, 58(7), 720021-7200212. Article 072002. https://doi.org/10.1103/PhysRevD.58.072002

Chan, AW, Cheng, DKC, Luk, KB, James, C, Rameika, R, Ho, PM, Longo, MJ, Nguyen, A, Duryea, J, Guglielmo, G, Heller, K, Johns, K, Diehl, HT, Teige, S, Thomson, GB & Zou, Y 1998, 'Measurement of the properties of the Ω̄⁺ and Ω^- hyperons', Physical Review D - Particles, Fields, Gravitation and Cosmology, vol. 58, no. 7, 072002, pp. 720021-7200212. https://doi.org/10.1103/PhysRevD.58.072002

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abstract = "We have analyzed {\=Ω}+ and Ω- events produced in the inclusive reaction p + Be → Ω + X and have measured some properties of the {\=Ω}+ and Ω- hyperons via the decay Ω → ΛK → pπK. The measured {\=Ω}+ + lifetime was τ{\=Ω} = (0.823±0.038) × 10-10 s (χ2/NDF = 1.52). and the measured decay parameter was α{\=Ω} = 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 {\=Ω}+ and Ω- yielded ΔMΩ/MΩ = (1.44±7.98) × 10-5. The measurements were all in good agreement with CPT invariance.",

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AU - Cheng, D. K.C.

AU - Luk, K. B.

AU - James, C.

AU - Rameika, R.

AU - Ho, P. M.

AU - Longo, M. J.

AU - Nguyen, A.

AU - Duryea, J.

AU - Guglielmo, G.

AU - Heller, K.

AU - Johns, K.

AU - Diehl, H. T.

AU - Teige, S.

AU - Thomson, G. B.

AU - Zou, Y.

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N2 - 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.

AB - 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.

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

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