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1999年 8月 ,美国 CELO实验组在对 1 .9× 1 0 7个 B介子衰变事例进行分析的基础上 ,给出了对 4个B→ Kη(′) 衰变道衰变分枝比的新实验测量结果 :B( B+ → K+ η′) =( 80 + 10-9± 7)× 1 0 -6B( B0→ K0η′) =( 88+ 18-16± 9)× 1 0 -6( 1 )B( B→ K+η) 6.9× 1 0 -6B(
In August 1999, the CELO experimental group in the United States gave a new experiment on decay branching ratio of four B → Kη (’) decay paths based on the analysis of 1.9 × 107 decay cases of B mesons Measurement results: B (B + → K + η ’) = (80 + 10-9 ± 7) × 1 0-6B (B0 → K0η’) = (88+ 18-16 ± 9) × 1 0-6 (1) B (B → K + η) 6.9 × 10 -6 B (