QCD sum rule study for hidden-strange pentaquarks |
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Authors: | Pengfei Yang Wei Chen |
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Institution: | School of Physics, Sun Yat-Sen University, Guangzhou 510275, China |
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Abstract: | Inspired by the LHCb observations of hidden-charm \begin{document}$ P_{c(s)} $\end{document}![]() states, we study their hidden-strange analog\begin{document}$ P_s $\end{document}![]() states in both the \begin{document}$ udu]\bar ss] $\end{document}![]() and \begin{document}$ uds]\bar su] $\end{document}![]() configurations. We investigate \begin{document}$ P_s $\end{document}![]() pentaquark states in the \begin{document}$ p\eta^\prime $\end{document}![]() , \begin{document}$ p\phi $\end{document}![]() , \begin{document}$ \Lambda K $\end{document}![]() , \begin{document}$ \Sigma K $\end{document}![]() , and \begin{document}$ \Sigma^\ast K^\ast $\end{document}![]() structures with \begin{document}$J^P ={1}/{2}^-$\end{document}![]() and \begin{document}$ \Sigma ^\ast K $\end{document}![]() and \begin{document}$ \Sigma K^\ast $\end{document}![]() with \begin{document}$J^P = {3}/{2}^-$\end{document}![]() and calculate their masses in the framework of QCD sum rules. Our numerical results show that the extracted hadron masses for all the \begin{document}$ p\eta^\prime $\end{document}![]() , \begin{document}$ p\phi $\end{document}![]() , \begin{document}$ \Lambda K $\end{document}![]() , \begin{document}$ \Sigma K $\end{document}![]() , and \begin{document}$ \Sigma^\ast K^\ast $\end{document}![]() structures are significantly higher than the \begin{document}$ \Sigma K $\end{document}![]() mass threshold, and the masses for \begin{document}$ \Sigma ^\ast K $\end{document}![]() and \begin{document}$ \Sigma K^\ast $\end{document}![]() are also higher than the threshold of the corresponding hadron; hence, no bound state exists in such channels, which is consistent with the current experimental status. |
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Keywords: | pentaquark states QCD sum rules |
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