2021/11/08 by Tan, Yue, Wu, Yuheng, Yang, Youchang +1
#FOS: Physical sciences #High Energy Physics - Phenomenology (hep-ph)
paper · doi:10.48550/arxiv.2111.04677
Recently, the BES\uppercase\expandafter\romannumeral3 Collaboration updated the data for the exotic state, D*s0(2317), with a mass of 2318.3±1.2±1.2 MeV from the positronium annihilation process. Inspired by the experiment, we systematically investigated the cq meson family spectrum from the perspectives of two-quark, four-quark, and mixed two-four-quark structures, including Ds, Ds*, Ds0*(2317), and Ds1(2460), with the help of the Gaussian expansion method, which is a very accurate calculation method for few-body systems. We found that with appropriate spin-orbit coupling parameter as, the chiral quark model can effectively describe both Ds0*(2317) and Ds1(2460). The four-quark calculation shows that the DK state does not form a bound state, but the effective potential calculation shows an attractive interaction between them. Finally, we performed mixed two-four-quark calculations, and the results, with the help of the unquenched effect, show that the energies of Ds0*(2317) and Ds1(2460) are in better agreement with experimental values. Therefore, we conclude that these two particles are good candidates for mixed two-four-quark states.