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arXiv 2003.09323hep-phhep-ex
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夸克模型中$Λ_c$的强弱衰变

Hadronic weak decays of $Λ_c$ in the quark model

Peng-Yu Niu, Jean-Marc Richard, Qian Wang, Qiang Zhao

摘要:

在组分夸克模型的框架下研究了$Λ_c$的强子弱衰变。通过对Cabbibo偏爱的过程$Λ_c\to Λπ^+$、$Σ^0π^+$和$Σ^+π^0$的综合分析,我们证实了不可因子化的跃迁机制在理解它们相容的分支比中起着至关重要的作用.我们强调指出,在具有内转换的图中,极项之间的相消干涉可以放大SU(3)味对称性破缺效应,其量级一般为$1\sim 2\%$。有些贡献对$Λ_c$中标量-等差轻夸克扇区的空间分布及其与末态超子中轻夸克的重叠很敏感。也就是说,一个紧凑的双夸克组态是不利的。

英文摘要:

The hadronic weak decays of $Λ_c$ are studied in the framework of a constituent quark model. With the combined analysis of the Cabbibo-favored processes, $Λ_c\to Λπ^+$, $Σ^0π^+$ and $Σ^+π^0$, we confirm that the non-factorizable transition mechanisms play a crucial role in the understanding of their compatible branching ratios. We emphasize that the SU(3) flavor symmetry breaking effects, which is generally at the order of $1\sim 2\%$, can be amplified by the destructive interferences among the pole terms in the diagrams with internal conversion. Some contributions are sensitive to the spatial distribution of the scalar-isoscalar light-quark sector in the $Λ_c$, and its overlap with the light quarks in the final state hyperon. Namely, a compact diquark configuration is disfavored.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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