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arXiv 0807.2170hep-ex
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观察$B^{\pm} \to ψ(2S) π^{\pm}$并搜索直接CP破坏

Observation of $B^{\pm} \to ψ(2S) π^{\pm}$ and search for direct CP-violation

V. Bhardwaj, R. Kumar, J. B. Singh

摘要:

我们报告的第一个观察到的$B^{\pm}\toψ(2S)π^{\pm}$,Cabibbo和颜色抑制衰变。这个分析是基于$657\times10^{6}$ $B\overline B$事件收集的$Υ(4S)$共振与贝尔探测器在KEKB能量不对称的$e^+e^-$对撞机。测得的支化分数为($2.44 \pm 0.22 \pm 0.20$)$\times 10^{-5}$,电荷不对称性为$\mathcal{A}=0.022 \pm 0.085 \pm 0.016$。还测定了支化分数$\mathcal {B}(B^{\pm} \to ψ(2S) π^{\pm})$ $/ \mathcal {B}(B^{\pm} \to ψ(2S) K^{\pm})$ $ = (3.99 \pm 0.36\pm 0.17)%$的比率。

英文摘要:

We report the first observation of $B^{\pm}\toψ(2S)π^{\pm}$, a Cabibbo- and color-suppressed decay. This analysis is based on $657\times10^{6}$ $B\overline B$ events collected at the $Υ(4S)$ resonance with the Belle detector at the KEKB energy-asymmetric $e^+e^-$ collider. The measured branching fraction is ($2.44 \pm 0.22 \pm 0.20$)$\times 10^{-5}$ and the charge asymmetry is $\mathcal{A}=0.022 \pm 0.085 \pm 0.016$. The ratio of the branching fractions $\mathcal {B}(B^{\pm} \to ψ(2S) π^{\pm})$$/ \mathcal {B}(B^{\pm} \to ψ(2S) K^{\pm})$ $ = (3.99 \pm 0.36\pm 0.17)%$ is also determined.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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