Observation of B± → ωK± decay
Observation of B± → ωK± decay
复制标题
观察 B± → ωK± 衰减
DOI：
10.1103/physrevlett.89.191801
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发表时间：
2002
期刊：
影响因子：
--
通讯作者：
E. al.
中科院分区：
文献类型：
--
作者：
R.;E. al.
我们报告了对无魅力二体模式 $B^{\pm} \to \omega K^{\pm}$ 衰变的首次观察，以及对 $B^{\pm} \to \omega \pi^{\pm}$ 衰变分支分数的新测量。测量的支化分数为 ${\cal B} (B^{\pm} \to \omega K^{\pm}) =
(9.2{}^{+2.6}_{-2.3}\pm 1.0) \times 10^{-6}$ 和 ${\cal B} (B^{\pm} \to \omega \pi^{\pm}) =
(4.2{}^{+2.0}_{-1.8}\pm 0.5) \times 10^{-6}$。 %并且我们设置 90% 置信度上限为 %${\cal B} (B^- \to \omega \pi^-) < 8.1\times 10^{-6}$。我们还测量了 $B^{\pm}\to\omega K^{\pm}$ 衰减的部分速率不对称性，并获得 ${\cal A}_{CP} = -0.21 \pm 0.28 \pm 0.03$。结果基于 KEKB $e^{+} e^{-}$ 对撞机上的 Belle 探测器在 $\Upsilon(4S)$ 共振上收集的 29.4 fb$^{-1}$ 数据样本。
We report the first observation of the charmless two-body mode $B^{\pm} \to \omega K^{\pm}$ decay, and a new measurement of the branching fraction for the $B^{\pm} \to \omega \pi^{\pm}$ decay. The measured branching fractions are ${\cal B} (B^{\pm} \to \omega K^{\pm}) =
(9.2{}^{+2.6}_{-2.3}\pm 1.0) \times 10^{-6}$ and ${\cal B} (B^{\pm} \to \omega \pi^{\pm}) =
(4.2{}^{+2.0}_{-1.8}\pm 0.5) \times 10^{-6}$. %and we set 90% confidence level upper limits of %${\cal B} (B^- \to \omega \pi^-) < 8.1\times 10^{-6}$. We also measure the partial rate asymmetry of $B^{\pm}\to\omega K^{\pm}$ decays and obtain ${\cal A}_{CP} = -0.21 \pm 0.28 \pm 0.03$. The results are based on a data sample of 29.4 fb$^{-1}$ collected on the $\Upsilon(4S)$ resonance by the Belle detector at the KEKB $e^{+} e^{-}$ collider.