Strong decays of singly heavy baryons from a chiral effective theory of diquarks
Strong decays of singly heavy baryons from a chiral effective theory of diquarks
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DOI：
10.1103/physrevd.107.074015
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发表时间：
2022-12
影响因子：
5
通讯作者：
Yonghee Kim;M. Oka;Daiki Suenaga;Kei Suzuki
中科院分区：
文献类型：
--
作者：
Yonghee Kim;M. Oka;Daiki Suenaga;Kei Suzuki
基于SU(3)_R×SU(3)_L手征对称性，考虑了标量和矢量双夸克与一个或两个介子的相互作用，建立了标量和矢量双夸克的手征有效理论。我们发现，与两个介子的双夸克相互作用项破坏了$U(1)_A$和风味$SU(3)$对称性。为了确定拉格朗日相互作用的耦合常数，我们研究了单重子QQQ$($q=c，b$和$q=u，d，S$)的单π辐射衰变，其中重子被视为双夸克-重夸克两体系统。利用这个模型，我们给出了未观测到的单重子衰变宽度的预测。我们还研究了手征对称性部分恢复时单个重子的质量和强衰变宽度的变化。
A chiral effective theory of scalar and vector diquarks is formulated, which is based on $SU(3)_R\times SU(3)_L$ chiral symmetry and includes interactions between scalar and vector diquarks with one or two mesons. We find that the diquark interaction term with two mesons breaks the $U(1)_A$ and flavor $SU(3)$ symmetries. To determine the coupling constants of the interaction Lagrangians, we investigate one-pion emission decays of singly heavy baryons $Qqq$ ($Q=c, b$ and $q=u,d,s$), where baryons are regarded as diquark--heavy-quark two-body systems. Using this model, we present predictions of the unobserved decay widths of singly heavy baryons. We also study the change of masses and strong decay widths of singly heavy baryons under partial restoration of chiral symmetry.