The Hidden Charm Decay of $X(3872),Y(3940)$ and Final State Interaction Effects

Abstract

We investigate whether the final state interaction (FSI) effect plays a significant role in the large hidden charm decay width of X(3872) and Y(3940) using a model. Our numerical result suggests (1) the FSI contribution to $X(3872)\to J/\psi \rho$ is tiny; (2) $\Gamma [Y(3940)\to D{\bar{D}}^{\ast }+\text{h.c.}\to J/\psi \omega ]$ from FSI is around several keV, far less than Belle's experimental value 7 MeV.

5 pages, 3 figures, 1 table. Version to appear in Physics Letters B

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