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Based on the prediction of a $D^*\bar{D}^*$ molecular state $Z_c(4000)$ withisospin $I=1$ in the coupled channel approach, we suggest to search for thisstate in the reaction $B^- \to J/\psi \rho^0 K^-$. By taking into account thefinal state interactions of $J/\psi \rho$ and $D^{*0}\bar{D}^{*0}$, and thecontribution from the $K_1(1270)$ resonance, we find that the $J/\psi\rho$ massdistribution shows a peak around 4000~MeV, which could be associated to the$D^*\bar{D}^*$ molecular state $Z_c(4000)$. Searching for the $Z_c(4000)$ inthe reaction $B^- \to J/\psi \rho^0 K^-$ is crucial to understand the internalstructures of the exotic hadrons, and our predictions can be tested by theBelle II and LHCb in future.

Search for the $D^*\bar{D}^*$ molecular state $Z_c(4000)$ in the reaction $B^{-} \rightarrow J/\psi \rho^0 K^{-}$

Search for the $D^\bar{D}^$ molecular state $Z_c(4000)$ in the reaction $B^{-} \rightarrow J/\psi \rho^0 K^{-}$