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arXiv 2005.12111hep-phhep-ex
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反三重态粲重子的双重Cabibbo抑制衰变

Doubly Cabibbo-suppressed decays of antitriplet charmed baryons

Guanbao Meng, Sam Ming-Yin Wong, Fanrong Xu

摘要:

本文系统地研究了反三重态粲重子的双重Cabibbo抑制(DCS)非轻子弱衰变。可因式分解和不可因式分解的贡献可以在拓扑图方法中明确分类并分开处理。特别是,不可因式分解项的评价是基于极点模型结合电流代数。所有三种类型的相关的非微扰参数贡献因子分解和nonfactorizable条款估计在MIT袋模型。所有的DCS衰变的分支分数被预测为顺序$10^{-4}\sim 10^{-6}$。特别地,我们发现三个模式$Ξ_c^+\to Σ^+ K^0, Σ^0 K^+$和$Ξ_c^0\to Σ^- K^+$与$(1\sim 2)\times 10^{-4}$一样大,这是最有希望被测量的DCS通道。本文还指出了两种DCS模式$Ξ_c^+\to Σ^+ K^0$和$Ξ_c^0\to Σ^0 K^0$与$Ξ_c^+\to Σ^+ K_S$和$Ξ_c^0\to Σ^0 K_S$的区别。在其最终状态的K介子的所有通道的衰变不对称性被发现是大的幅度和负的符号。

英文摘要:

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.

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