论文标题
双cabbbo抑制的抗titriplet的腐烂
Doubly Cabibbo-suppressed decays of antitriplet charmed baryons
论文作者
论文摘要
在这项工作中，对双重抑制的cabibbo抑制（DCS）非法律弱衰变进行了系统的研究。可以在拓扑数字方法中明确对可分解和不可分割的贡献进行分类，并分别处理。特别是，对不可分割的术语的评估是基于与当前代数结合使用的POL模型。在MIT袋模型中估算了所有三种相关的非扰动参数，这些参数造成了可分解的和不可分割的术语。所有DCS衰减的分支分数预计为$ 10^{ - 4} \ sim 10^{ - 6} $。特别是，我们发现三种模式$ξ_c^+\ toσ^+k^0，σ^0 k^+$和$ξ_c^0 \ toσ^ - k^+$与$（1 \ sim 2）\ times 10^{ - 4} $一样大，这是最有利的DCS通道。我们还指出，两个DCS模式$ξ_c^+ \ toσ^+ k^0 $和$ξ_c^0 \ toσ^0 k^0 $可以与$ξ_c^+ \ to c^+ \ t t t t t t toσ^+ k_s $和$ξ_c^0 \ to x^0 k__s $区别。所有在最终状态中具有KAON的通道的衰减不对称性在大小且符号较大。
Doubly Cabibbo-suppressed (DCS) nonleptonic weak decays of antitriplet charmed baryons are studied systematically in this work. The factorizable and nonfactorizable contributions can be classified explicitly in the topological-diagram approach and treated separately. In particular, the evaluation of nonfactorizable terms is based on the pole model in conjunction with current algebra. All three types of relevant non-perturbative parameters contributing factorizable and nonfactorizable terms are estimated in the MIT bag model. Branching fractions of all the DCS decays are predicted to be of order $10^{-4}\sim 10^{-6}$. In particular, we find that the three modes $Ξ_c^+\to Σ^+ K^0, Σ^0 K^+$ and $Ξ_c^0\to Σ^- K^+$ are as large as $(1\sim 2)\times 10^{-4}$, which are the most promising DCS channels to be measured. We also point out that the two DCS modes $Ξ_c^+\to Σ^+ K^0$ and $Ξ_c^0\to Σ^0 K^0$ are possible to be distinguished from $Ξ_c^+\to Σ^+ K_S$ and $Ξ_c^0\to Σ^0 K_S$. The decay asymmetries for all the channels with a kaon in their final states are found to be large in magnitude and negative in sign.
