Z_cs(4000)⁺ and Z_cs(4220)⁺ in a Multiquark Color Flux-Tube Model

We systematically investigate the mass spectrum, spatial configuration and magnetic moment of the ground and p-wave states $cu\overline{c}\overline{s}$ with various color-spin configurations in a multiquark color flux-tube model. Numerical results indicate that the state Z_cs(4000)⁺ can be described as the compact state $cu\overline{c}\overline{s}$ with 1³S₁. Its main color-spin configuration is ${cu}_{{\mathit{6}}_c}^1{\overline{c}\overline{s}}_{{\overline{\mathit{6}}}_c}^1$ and its magnetic moment is 0.73μ_N. The state $Z_{cs}{(4220)}^{+}$ can be depicted as the compact state $cu\overline{c}\overline{s}$ with 1¹P₁ (or 1³P₁). Its main color-spin configuration is ${cu}_{{\overline{\mathit{3}}}_c}^0{\overline{c}\overline{s}}_{{\mathit{3}}_c}^0$ (or ${cu}_{{\overline{\mathit{3}}}_c}^0{\overline{c}\overline{s}}_{{\mathit{3}}_c}^1$) and its magnetic moment is 0.12μ_N (or 0.64μ_N). The physical state should be the mixture of these two different color-spin configurations and deserves further investigation. In addition, we also predict the properties of the states $cu\overline{c}\overline{s}$ with other quantum numbers in the model.