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arXiv 2202.07804hep-phnucl-th
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手征模型中类Roper单重子的衰变

Decays of Roper-like singly heavy baryons in a chiral model

Daiki Suenaga, Atsushi Hosaka

摘要:

通过研究重子中双夸克的手征表示,我们提出了一个手征模型来描述类Roper的$Λ_c(2765)$和$Ξ_c(2970)$以及重夸克自旋二重态$\{Σ_c(2455),Σ_c(2520)\}$和$\{Ξ_c',Ξ_c(2645)\}$的衰变.基于我们的手征模型和重夸克自旋对称性,我们导出了重子轴荷所满足的关系,它控制着重子的一π(K介子)衰变的大小。此外,合理的轴向电荷值解释了Roper类$Λ_c(2765)$和$Ξ_c(2970)$的大衰变宽度,这是传统的非相对论夸克模型所不能实现的.此外,我们将手征模型应用于底重子,并预测了未发现的类罗珀$Ξ_b$的衰变宽度。我们希望我们的研究能从手征对称性的角度解释激发态重子的动力学性质。

英文摘要:

We present a chiral model describing decays of the Roper-like $Λ_c(2765)$ and $Ξ_c(2970)$ as well as those of the heavy quark spin-doublet $\{Σ_c(2455),Σ_c(2520)\}$ and $\{Ξ_c',Ξ_c(2645)\}$, by focusing on chiral representations of diquarks inside the heavy baryons. Based on our chiral model together with the heavy quark spin symmetry, we derive a relation satisfied by axial charges of the heavy baryons that controls magnitude of their one pion (kaon) decays. Besides, it is shown that the large decay widths of the Roper-like $Λ_c(2765)$ and $Ξ_c(2970)$, which cannot be implemented by conventional non-relativistic quark models, are explained by reasonable values of the axial charges. In addition, we apply the chiral model to bottom baryons and predict decay widths of the undiscovered Roper-like $Ξ_b$. We expect that our present investigation leads to elucidation of dynamical properties of the excited heavy baryons from the viewpoint of chiral symmetry.

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