论文标题
在$ξ_{C}^{0} \rightArrowξ^{0} k^+ k^ - $中的谐振和非谐振分支比率的测量
Measurement of the Resonant and Non-Resonant Branching Ratios in $Ξ_{c}^{0} \rightarrow Ξ^{0} K^+ K^-$
论文作者
论文摘要
使用整个数据示例$ 980 $ $ $ fb^{ - 1} $集成的光度集成的光度与Belle检测器在Kekb不对称 - 能量$ e^{+} e^{+} e^{ - } $ collider中，我们进行了glumitude Anallys，用于测量Cabibbo-wallow的分支分析，0 \rightArrowξ^{0} ϕ（\ to k^+ k^ - ）$带有偏光$ ϕ $和通过直接过程的非共振衰减$我们介绍了这些测量值，相对于归一化模式$ξ^{ - }π^{+} $，并找到分支比率$ \ frac {\ mathcal {b}（ξ_{c}^{0}^{0} {0} \ rightArrowξ^{0} ϕ（0} ϕ（\ rightarrow） k^{+} k^{ - }））}}} {\ Mathcal {b}（ξ_{C}^{0}^{0} \rightArrowξ^{ - }π^{+}} = 0.036 = 0.036 \ pm 0.004（stat。） $ \ frac {\ Mathcal {b}（ξ_{c}^{0} \ rightArrowξ^{0} k^{+} k^{+} k^{ - }} {\ Mathcal {b} \ pm 0.004（stat。）\ pm 0.002（syst。）$，这表明在$ω^{* - } \ toξ^{0} k^{ - } $的组合背景中仅出现较小的cusping峰。
Using the entire data sample of $980$ $fb^{-1}$ integrated luminosity collected with the Belle detector at the KEKB asymmetric-energy $e^{+}e^{-}$ collider, we present an amplitude analysis measuring the branching fractions of the Cabibbo-allowed, $W$-exchange resonant decay $Ξ_{c}^{0} \rightarrow Ξ^{0} ϕ(\to K^+ K^-)$ with a polarized $ϕ$ and the non-resonant decay via a direct process $Ξ_{c}^{0} \rightarrow Ξ^{0} K^+ K^-$. We present these measurements, relative to the normalization mode $Ξ^{-}π^{+}$, and find branching ratios $\frac{\mathcal{B}(Ξ_{c}^{0} \rightarrow Ξ^{0} ϕ(\rightarrow K^{+}K^{-}))}{\mathcal{B}(Ξ_{c}^{0} \rightarrow Ξ^{-} π^{+})} = 0.036 \pm 0.004 (stat.) \pm 0.002 (syst.)$ and $\frac{\mathcal{B}(Ξ_{c}^{0} \rightarrow Ξ^{0} K^{+} K^{-})}{\mathcal{B}(Ξ_{c}^{0} \rightarrow Ξ^{-} π^{+})} = 0.039 \pm 0.004 (stat.) \pm 0.002 (syst.)$ which suggest that only minor cusping peaks occur in the combinatorial background of $Ω^{*-} \to Ξ^{0}K^{-}$ due to these $Ξ_{c}^{0}$ decays.
