𝑋(1870) and 𝜂₂(1870): Which Can Be Assigned as a Hybrid State?

Figure 6

Two topological diagrams for a 𝑞𝑞 meson decay in the ³𝑃₀ decay model. We refer to the left one as 𝑑1 where the produced quark goes into meson 𝐶 and 𝑑2 where it goes into 𝐵.

(a)

(b)