论文标题
$ξ_{c}^{0} \λ_{c}^{+}π^{ - } $的分支分数的测量
Measurement of the branching fraction of $Ξ_{c}^{0}\to Λ_{c}^{+}π^{-}$ at Belle
论文作者
论文摘要
基于与983 Fb $^{ - 1} $的983 fb $^{ - 1} $的数据样本，在Kekb kekb非对称能源$ e^+e^ - $ collider上，我们介绍了对重效率衰减$ξ_的研究$λ_{c}^{+} $通过其$ pk^{ - }π^{+} $衰减模式重建。分支分数$ \ MATHCAL {B}（ξ_{C}^{0} \toλ_{C}^{+}^{+}π^{ - }）/\ Mathcal {b}（B}（ξ_ 0.04 \ pm 0.04 $。与$ \ MATHCAL {B}（ξ_{C}^{0} \ toξ^{ - }π^{+} $的世界平均值梳理，分支分数$ \ Mathcal {B}为$（0.54 \ pm 0.05 \ pm 0.05 \ pm 0.12）\％$。在这里，上面的不确定性分别是统计，系统的，并且是从$ \ mathcal {b}（ξ_c^{0} \ toξ^{ - }π^{+}）$。
Based on a data sample of 983 fb$^{-1}$ collected with the Belle detector at the KEKB asymmetric-energy $e^+e^-$ collider, we present the study of the heavy-flavor-conserving decay $Ξ_{c}^{0}\to Λ_{c}^{+}π^{-}$ with $Λ_{c}^{+}$ reconstructed via its $pK^{-} π^{+}$ decay mode. The branching fraction ratio $\mathcal{B}(Ξ_{c}^{0}\to Λ_{c}^{+}π^{-})/\mathcal{B}(Ξ_{c}^{0}\to Ξ^{-}π^{+})$ is measured to be $0.38 \pm 0.04 \pm 0.04$. Combing with the world average value of $\mathcal{B}(Ξ_{c}^{0}\to Ξ^{-}π^{+})$, the branching fraction $\mathcal{B}(Ξ_{c}^{0}\to Λ_{c}^{+}π^{-})$ is deduced to be $(0.54 \pm 0.05 \pm 0.05 \pm 0.12)\%$. Here, the uncertainties above are statistical, systematic, and from $\mathcal{B}(Ξ_c^{0} \to Ξ^{-}π^{+})$, respectively.
