Measurement of Ω − decay properties in the CERN SPS hyperon beam

• Published in: Nuclear physics. B 1984-01, Vol.241 (1), p.1-47
• Main Authors: Bourquin, M., Brown, R.M., Chollet, J.C., Degré, A., Froidevaux, D., Gaillard, J.-M., Gee, C.N.P., Gerber, J.-P., Gibson, W.M., Igo-Kemenes, P., Jeffreys, P.W., Jung, M., Merkel, B., Morand, R., Plothow-Besch, H., Repellin, J.-P., Riester, J.-L., Saunders, B.J., Sauvage, G., Schiby, B., Siebert, H.W., Smith, V.J., Streit, K.-P., Strub, R., Thresher, J.J., Tovey, S.N.
• Format: Article
• Language: English
• Subjects: High Energy Physics - Experiment; Physics
• ISSN: 0550-3213; 1873-1562
• DOI: 10.1016/0550-3213(84)90195-0

In an experiment in the CERN SPS charged hyperon beam, a sample of 16 000Ω − decays was collected at an Ω − momentum of 131 GeV/ c the Ω − lifetime, the branching ratios and decay asymmetry parameters for the main decay modes were measured, giving: τ Ω − =(0.823±0.015)×10 −10 s , Γ(Ω −→Λ K −) Γ(Ω −-→ all) =0.675±0.008 , α(Ω −→Λ K −)= −0.025±0.028, Γ(Ω −→Ξ 0π −) Γ(Ω −→ all) = 0.236±0.008 , α(Ω −→Ξ 0π −)=0.09±0.14, Γ(Ω −→Ξ −π 0) Γ(Ω −→ all) =0.089±0.005 , α(Ω −→Ξ −π 0)=0.05±0.21. For the rare decay modes, the following results for the branching ratios were obtained: if Γ(Ω −→Ξ 0 e − ν) Γ(Ω −→ all) =(0.56±0.28)×10 −2 , if Γ(Ω −→Ξ −π +π −) (Γ(Ω→ all) =(3.7 −1.1 +3.6)×10 −4 , Γ(Ω −→Ξ −γ) (Γ(ω −→ all)