The tetraquark states and the structure of X(2239) observed by the BESIII collaboration * * This project is supported by the National Natural Science Foundation of China (11705056, 11475192, U1832173, 11975245). This work is also supported by the Sino-German CRC 110 ”Symmetries and the Emergence of Structure in QCD” project by NSFC (11621131001) and the Key Research Program of Frontier

Abstract

We investigate the mass spectrum of the tetraquark states in the relativized quark model. By solving the Schrödinger-like equation with the relativized potential, the masses of S- and P-wave tetraquarks are obtained. The screening effects are also taken into account. It is found that the resonant structure observed in the process by the BESIII collaboration can be assigned as a P-wave tetraquark state. Furthermore, the radiative transition and the strong decay behavior of this structure are also estimated, which can provide helpful information for future experimental searches.