Improved measurements of branching fractions for ηc →φφ and ωφ M. Ablikim, M. N. Achasov, X. C. Ai [et.al.]
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ArticleSubject(s): BESIII, детектор | BEPCII, коллайдерGenre/Form: статьи в журналах Online resources: Click here to access online
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Physical Review D Vol. 95, № 9. P. 092004-1-092004-13Abstract: Using ð223.7 1.4Þ × 106 J=ψ events accumulated with the BESIII detector, we study ηc decays to ϕϕ and ωϕ final states. The branching fraction of ηc → ϕϕ is measured to be Brðηc → ϕϕÞ ¼ ð2.5 0.3þ0.3 −0.7 0.6Þ × 10−3, where the first uncertainty is statistical, the second is systematic, and the third is from the uncertainty of BrðJ=ψ → γηcÞ. No significant signal for the double Okubo-Zweig-Iizuka suppressed decay of ηc → ωϕ is observed, and the upper limit on the branching fraction is determined to be Brðηc → ωϕÞ < 2.5 × 10−4 at the 90% confidence level.
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Using ð223.7 1.4Þ × 106 J=ψ events accumulated with the BESIII detector, we study ηc decays to ϕϕ and ωϕ final states. The branching fraction of ηc → ϕϕ is measured to be Brðηc → ϕϕÞ ¼ ð2.5 0.3þ0.3 −0.7 0.6Þ × 10−3, where the first uncertainty is statistical, the second is systematic, and the third is from the uncertainty of BrðJ=ψ → γηcÞ. No significant signal for the double Okubo-Zweig-Iizuka suppressed decay of ηc → ωϕ is observed, and the upper limit on the branching fraction is determined to be Brðηc → ωϕÞ < 2.5 × 10−4 at the 90% confidence level.
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