Belle実験におけるB+ Xcc K+およびB+ D(0 +崩壊の分岐比の絶対値測定

機関リポジトリ

書誌事項

タイトル別名
  • Measurements of the absolute branching fractions of B+ Xcc K+ and B+ D(0 + at Belle

この論文をさがす

説明

We present the measurement of the absolute branching fractions of $B^{+} \to X_{c\bar{c}} K^{+}$ and $B^{+} \to \bar{D}^{(\ast) 0} \pi^{+} $ decays, using a data sample of $772\times10^{6}$ $B\bar{B}$ pairs collected at the $\Upsilon(4S)$ resonance with the Belle detector at the KEKB asymmetric-energy $e^{+}e^{-}$ collider. Here, $X_{c\bar{c}}$ denotes $\eta_{c}$, $J/\psi$, $\chi_{c0}$, $\chi_{c1}$, $\eta_{c}(2S)$, $\psi(2S)$, $\psi(3770)$, $X(3872)$, and $X(3915)$. We do not observe significant signals for $X(3872)$ nor $X(3915)$, and set the 90$\%$ confidence level upper limits: ${\cal B}(B^{+} \to X(3872) K^{+} ) < 2.7 \times 10^{-4}$ and ${\cal B}(B^{+} \to X(3915) K^{+} ) < 2.9 \times 10^{-4}$. These represent the most stringent upper limit for ${\cal B}(B^{+} \to X(3872) K^{+} )$ to date and the first measurement for ${\cal B}(B^{+} \to X(3915) K^{+} )$. The measured branching fractions for $\eta_{c}$ and $\eta_{c}(2S)$ are the most precise to date: ${\cal B}(B^{+} \to \eta_{c} K^{+})=(12.3\pm0.8\pm0.7) \times 10^{-4}$ and ${\cal B}(B^{+} \to \eta_{c}(2S)K^{+}) =(4.9\pm1.1\pm0.3) \times 10^{-4}$, where the first and second uncertainties are statistical and systematic, respectively.

収録刊行物

  • Physical Review D

    Physical Review D 97 (1), 012005_1-012005_10, 2018-01

    American Physical Society

詳細情報 詳細情報について

問題の指摘

ページトップへ