Low-lying charmed and charmed-strange baryon states

作者：Bing Chen, Ke-Wei Wei, Xiang Liu, Takayuki Matsuki · 发表于：The European Physical Journal C · 年份：2017 · DOI：10.1140/epjc/s10052-017-4708-x · 被引用次数：104 · 研究领域：Quantum Chromodynamics and Particle Interactions、Pulsars and Gravitational Waves Research、Particle physics theoretical and experimental studies

In this work, we systematically study the mass spectra and strong decays of 1P and 2S charmed and charmed-strange baryons in the framework of non-relativistic constituent quark models. With the light quark cluster–heavy quark picture, the masses are simply calculated by a potential model. The strong decays are studied by the Eichten–Hill–Quigg decay formula. Masses and decay properties of the well-established 1S and 1P states can be reproduced by our method. $$\Sigma _c(2800)^{0,+,++}$$ can be assigned as a $$\Sigma _{c2}(3/2^-)$$ or $$\Sigma _{c2}(5/2^-)$$ state. We prefer to interpret the signal $$\Sigma _c(2850)^0$$ as a $$2S(1/2^+)$$ state although at present we cannot thoroughly exclude the possibility that this is the same state as $$\Sigma _c(2800)^0$$ . $$\Lambda _c(2765)^+$$ or $$\Sigma _c(2765)^+$$ could be explained as the $$\Lambda _c^+(2S)$$ state or $$\Sigma ^+_{c1}(1/2^-)$$ state, respectively. We propose to measure the branching ratio of $$\mathcal {B}(\Sigma _c(2455)\pi )/\mathcal {B}(\Sigma _c(2520)\pi )$$ in the future, which may disentangle the puzzle of this state. Our results support $$\Xi _c(2980)^{0,+}$$ as the first radial excited state of $$\Xi _c(2470)^{0,+}$$ with $$J^P=1/2^+$$ . The assignment of $$\Xi _c(2930)^0$$ is analogous to $$\Sigma _c(2800)^{0,+,++}$$ , i.e., a $$\Xi ^\prime _{c2}(3/2^-)$$ or $$\Xi ^\prime _{c2}(5/2^-)$$ state. In addition, we predict some typical ratios among partial decay widths, which are valuable for experimental searc...