论文标题
单人抑制decay的证据$ω^0_c \toξ^-π^+$，并搜索$ω^0_c \to葱
Evidence for the singly Cabibbo-suppressed decay $Ω^0_c\toΞ^-π^+$ and search for $Ω^0_c\toΞ^-K^+$ and $Ω^-K^+$ decays at Belle
论文作者
论文摘要
Using a data sample of 980 fb$^{-1}$ collected with the Belle detector at the KEKB asymmetric-energy $e^+e^-$ collider, we study for the first time the singly Cabibbo-suppressed decays $Ω^0_c\toΞ^{-}π^{+}$ and $Ω^-K^+$ and the doubly Cabibbo-suppressed衰减$ω^0_c \ toξ^-k^{+} $。 $ω^0_c $信号在$ω^0_c \toξ^-π^+$模式中的证据报告为$4.5σ$，包括系统的不确定性。分支分数与归一化模式的比率$ω_c^0 \与ω^-π^+$的比率为$$ {\ cal b}（ω__{C}^{0}^{0} \ toξ^{ - ξ^{ - }π^{+}π^{+}） 0.053（{\ rm Stat。}）\ PM 0.030（{\ rm syst。}）。 $ 90 \％$ $ $的上限置信度的分支级分的置信度确定为$$ {\ cal b}（ω__{C}^{0}^{0} \ toξ^{ - } k^{+} {+} {+} {+cal b}/{\ cal b}（\ cal b}（ b}（ω__{c}^{0} \ toω^{ - } k^{+}）/{\ cal b}（ω__c^0 \ toω^-π^+）<0.29。$ $$
Using a data sample of 980 fb$^{-1}$ collected with the Belle detector at the KEKB asymmetric-energy $e^+e^-$ collider, we study for the first time the singly Cabibbo-suppressed decays $Ω^0_c\toΞ^{-}π^{+}$ and $Ω^-K^+$ and the doubly Cabibbo-suppressed decay $Ω^0_c\to Ξ^- K^{+}$. Evidence for an $Ω^0_c$ signal in the $Ω^0_c\toΞ^-π^+$ mode is reported with a significance of $4.5σ$ including systematic uncertainties. The ratio of branching fractions to the normalization mode $Ω_c^0\to Ω^-π^+$ is measured to be $${\cal B}(Ω_{c}^{0} \to Ξ^{-} π^{+} )/{\cal B}(Ω_c^0\to Ω^-π^+)=0.253\pm 0.053({\rm stat.})\pm 0.030({\rm syst.}).$$ No significant signals of $Ω^0_c\toΞ^-K^+$ and $Ω^-K^+$ modes are found. The upper limits at $90\%$ confidence level on ratios of branching fractions are determined to be $${\cal B}(Ω_{c}^{0} \to Ξ^{-} K ^{+})/{\cal B}(Ω_c^0\to Ω^-π^+) < 0.070$$ and $${\cal B}(Ω_{c}^{0} \to Ω^{-}K^{+})/{\cal B}(Ω_c^0\to Ω^-π^+) < 0.29.$$
