Systematic studies of $DDKK$ and $D\bar{D}K\bar{K}$ four-hadron molecules

Abstract

Assuming that $D_{s0}^{\ast }(2317)$ is a $DK$ molecular state with a binding energy of 45 MeV, we investigate the existence of four-hadron molecules, $DDKK$ and $D\text{Bar}DK\text{Bar}K$, with the Gaussian expansion method. Their binding energies are $138\sim 155$ MeV and $123\sim 163$ MeV below the mass thresholds of $DDKK$ and $D\text{Bar}DK\text{Bar}K$. The $D\text{Bar}DK\text{Bar}K$ state has a decay width of $36\sim 54$ MeV due to the complex $K\text{Bar}K$ interaction. Further theoretical studies of and experimental searches for such four-hadron molecules can help deepen the understanding of the nonperturbative strong interaction in a nontrivial way.

Comments: 8 pages, 5 figures