QCD sum rule study for hidden-strange pentaquarks* *Supported by the National Natural Science Foundation of China (12175318), the National Key R & D Program of China (2020YFA0406400) and the Fundamental Research Funds for the Central Universities

Abstract

Inspired by the LHCb observations of hidden-charm states, we study their hidden-strange analog states in both the and configurations. We investigate pentaquark states in the , , , , and structures with and and with and calculate their masses in the framework of QCD sum rules. Our numerical results show that the extracted hadron masses for all the , , , , and structures are significantly higher than the mass threshold, and the masses for and 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.