Toward discovering low-lying P-wave excited Σc baryon states |
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| Authors: | Kai-Lei Wang Xian-Hui Zhong |
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| Affiliation: | 1. Department of Electronic Information and Physics, Changzhi University, Changzhi 046011,China2. Department of Physics, Hunan Normal University, and Key Laboratory of Low-Dimensional Quantum Structures and Quantum Control of Ministry of Education, Changsha 410081, China3. Synergetic Innovation Center for Quantum Effects and Applications (SICQEA), Hunan Normal University, Changsha 410081, China |
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| Abstract: | In this study, by combining the equal spacing rule with recent observations of \begin{document}$ \Omega_c(X) $\end{document}![]() ![]() and \begin{document}$ \Xi_c(X) $\end{document}![]() ![]() baryons, we predict the spectrum of the low-lying \begin{document}$ \lambda $\end{document}![]() ![]() -mode \begin{document}$ 1P $\end{document}![]() ![]() -wave excited \begin{document}$ \Sigma_c $\end{document}![]() ![]() states. Furthermore, their strong decay properties are predicted using the chiral quark model and the nature of \begin{document}$ \Sigma_c(2800) $\end{document}![]() ![]() is investigated by analyzing the \begin{document}$ \Lambda_c\pi $\end{document}![]() ![]() invariant mass spectrum. The \begin{document}$ \Sigma_c(2800) $\end{document}![]() ![]() structure observed in the \begin{document}$ \Lambda_c \pi $\end{document}![]() ![]() mass spectrum was found to potentially arise from two overlapping \begin{document}$ P $\end{document}![]() ![]() -wave \begin{document}$ \Sigma_c $\end{document}![]() ![]() resonances, \begin{document}$ \Sigma_c(2813)3/2^- $\end{document}![]() ![]() and \begin{document}$ \Sigma_c(2840)5/2^- $\end{document}![]() ![]() . These resonances have similar decay widths of \begin{document}$ \Gamma\sim 40 $\end{document}![]() ![]() MeV and predominantly decay into the \begin{document}$ \Lambda_c \pi $\end{document}![]() ![]() channel. The \begin{document}$ \Sigma_c(2755)1/2^- $\end{document}![]() ![]() state is likely to be a very narrow state with a width of \begin{document}$ \Gamma\sim 15 $\end{document}![]() ![]() MeV, with its decays almost saturated by the \begin{document}$ \Lambda_c \pi $\end{document}![]() ![]() channel. Additionally, evidence of the \begin{document}$\Sigma_c(2755) {1}/{2}^-$\end{document}![]() ![]() resonance as a very narrow peak may be seen in the \begin{document}$ \Lambda_c\pi $\end{document}![]() ![]() invariant mass spectrum. The other two \begin{document}$ P $\end{document}![]() ![]() -wave states, \begin{document}$\Sigma_c(2746) {1}/{2}^-$\end{document}![]() ![]() and \begin{document}$\Sigma_c(2796) {3}/{2}^-$\end{document}![]() ![]() , are relatively narrow states with similar widths of \begin{document}$ \Gamma\sim 30 $\end{document}![]() ![]() MeV and predominantly decay into \begin{document}$ \Sigma_c\pi $\end{document}![]() ![]() and \begin{document}$ \Sigma^{*}_c\pi $\end{document}![]() ![]() , respectively. This study can provide useful references for discovering these low-lying \begin{document}$ P $\end{document}![]() ![]() -wave states in forthcoming experiments. |
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| Keywords: | quark model strong decay Σc baryons |
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