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arXiv 1804.04872hep-phnucl-th
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基于手性伴侣结构的$Λ_c(2595)$、$Λ_c(2625)$、$Λ_b(5912)$、$Λ_b(5920)$的分析

Analysis of $Λ_c(2595)$, $Λ_c(2625)$, $Λ_b(5912)$, $Λ_b(5920)$ based on a chiral partner structure

Yohei Kawakami, Masayasu Harada

摘要:

在考虑手征对称性和重夸克自旋味对称性的前提下,将$Λ_c(2595)$,$Λ_c(2625)$,$Λ_b(5912)$和$Λ_b(5920)$分别作为$Σ_c(2455)$,$Σ_c(2520)$,$Σ_b$和$Σ_b^\ast$的手征伙伴,构造了一个有效的强子模型.我们确定的模型参数从实验数据的相关质量和衰变宽度的$Σ_c^{(\ast)}$和$Λ_c(2595)$。然后,我们研究了$Λ_c(2625)$,$Λ_b(5912)$和$Λ_b(5920)$的衰变宽度。我们发现,虽然$Λ_c(2595)$的衰减主要是通过$Σ_c(2455)$的共振贡献,非共振贡献是重要的$Λ_c(2625)$,$Λ_b(5912)$和$Λ_b(5920)$,这反映了手性伙伴结构。我们还研究了重子的辐射衰变,并表明它们的宽度是由它们的手征伙伴的辐射衰变宽度决定的。

英文摘要:

We construct an effective hadronic model including $Λ_c(2595)$, $Λ_c(2625)$, $Λ_b(5912)$ and $Λ_b(5920)$ regarding them as chiral partners to $Σ_c(2455)$, $Σ_c(2520)$, $Σ_b$ and $Σ_b^\ast$, respectively, with respecting the chiral symmetry and heavy-quark spin-flavor symmetry. We determine the model parameters from the experimental data for relevant masses and decay widths of $Σ_c^{(\ast)}$ and $Λ_c(2595)$. Then, we study the decay widths of $Λ_c(2625)$, $Λ_b(5912)$ and $Λ_b(5920)$. We find that, although the decay of $Λ_c(2595)$ is dominated by the resonant contribution through $Σ_c(2455)$, non-resonant contributions are important for $Λ_c(2625)$, $Λ_b(5912)$ and $Λ_b(5920)$, which reflects the chiral partner structure. We also study the radiative decays of the baryons, and show that each of their widths is determined from the radiative decay width of their chiral partners.

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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