オクノ ショウジ   Okuno Shoji
  奥野 祥二
   所属   神奈川大学  工学部 情報システム創成学科
   職種   助教
言語種別 日本語
発行・発表の年月 2001/10
形態種別 学術雑誌
標題 Measurements of the Branching Fraction for B → ηK and Search for B → ηπ+
執筆形態 共著
掲載誌名 Physics Letters B: Volume 517 (3-4), (2001)
巻・号・頁 309-318頁
概要 K. Abe, S. Okuno, et al. [Belle Collaboration] ,
We report measurements for two-body charmless hadronic B decays with an η meson in the final
state. Using 11.1 × 106B{B} pairs collected with the Belle detector, we find BF(B+ → ηK+) = (79+12-11 ± 9) × 10-6 and BF(B0 → ηK0) = (55+19-16± 8) × 10-6, where the first and second errors are statistical and systematic, respectively. No signal is observed in the mode B+ → ηπ+, and we set a 90% confidence level upper limit of BF(B+ → ηπ+) < 7×10-6. The CP asymmetry in B± → ηK± decays is investigated and a limit at 90% confidence level of 0.20 < ACP < 0.32 is obtained.