Spectrum of singly heavy baryons from a chiral effective theory of diquarks
Spectrum of singly heavy baryons from a chiral effective theory of diquarks
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DOI：
10.1103/physrevd.102.014004
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发表时间：
2020-03
影响因子：
5
通讯作者：
Yonghee Kim;E. Hiyama;M. Oka;Kei Suzuki
中科院分区：
文献类型：
--
作者：
Yonghee Kim;E. Hiyama;M. Oka;Kei Suzuki
单粲重子和底部重子的质谱 ${\mathrm{\ensuremath{\Lambda}}}_{c/b}(1/{2}^{\ifmmode\pm\else\textpm\fi{}},3/{2}^{\ensuremath{-}})$ 和${\mathrm{\ensuremath{\Xi}}}_{c/b}(1/{2}^{\ifmmode\pm\else\textpm\fi{}},3/{2}^{\ensuremath{-}})$，使用具有重夸克和轻双夸克的非相对论势模型进行研究。标量和赝标量双夸克的质量取自手性有效理论。 ${U}_{A}(1)$ 异常的影响会导致奇异和非奇异赝标量双夸克质量之间的逆层次结构，从而导致单重重子的 $\ensuremath{\rho}$ 模式激发中出现类似的逆质量排序。
The mass spectra of singly charmed and bottom baryons, ${\mathrm{\ensuremath{\Lambda}}}_{c/b}(1/{2}^{\ifmmode\pm\else\textpm\fi{}},3/{2}^{\ensuremath{-}})$ and ${\mathrm{\ensuremath{\Xi}}}_{c/b}(1/{2}^{\ifmmode\pm\else\textpm\fi{}},3/{2}^{\ensuremath{-}})$, are investigated using a nonrelativistic potential model with a heavy quark and a light diquark. The masses of the scalar and pseudoscalar diquarks are taken from a chiral effective theory. The effect of ${U}_{A}(1)$ anomaly induces an inverse hierarchy between the masses of strange and nonstrange pseudoscalar diquarks, which leads to a similar inverse mass ordering in $\ensuremath{\rho}$-mode excitations of singly heavy baryons.