Revisiting hidden-charm pentaquarks from QCD sum rules * * Supported by National Natural Science Foundation of China (11722540, 11261130311), Fundamental Research Funds for the Central Universities, and Foundation for Young Talents in College of Anhui Province (gxyq2018103)

Abstract

We revisit hidden-charm pentaquark states and using the method of QCD sum rules by requiring the pole contribution to be greater than or equal to 30% in order to better that the one-pole parametrization is valid. We find two mixing currents, and our results suggest that and can be identified as hidden-charm pentaquark states having and , respectively. However, there still exist other possible spin-parity assignments, such as and , which must be clarified in further theoretical and experimental studies.