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We study the decay of $\Lambda_b\to J/\psi\Lambda\phi$ by taking into accountthe intermediate resonances $X(4140)$, $X(4160)$, and $P_{cs}(4459)$. Inaddition to the peak of the $X(4140)$, we also find a bump structure around4160 MeV followed by a cusp structure around $D^*_s\bar{D}^*_s$ threshold inthe $J/\psi\phi$ invariant mass distribution of the $\Lambda_b\toJ/\psi\Lambda\phi$ process, which can be associated to the $D^*_s\bar{D}^*_s$molecular state $X(4160)$. We also show that this reaction can also be used toconfirm the existence of the hidden-charm pentaquark $P_{cs}(4459)$ withstrangeness. We predict an enhancement structure close to the threshold in the$D^*_s\bar{D}^*_s$ invariant mass distribution of the $\Lambda_b\toD^*_s\bar{D}^*_s\Lambda$ process, which is the reflection of the $X(4160)$ andshould not be misidentified with a new resonance. We strongly suggestexperimentalists to further measure these processes, which can be useful toclarify the nature of $X(4140)$ and $X(4160)$ resonances, and to confirm theexistence of the $P_{cs}(4459)$.

The resonances $X(4140)$, $X(4160)$, and $P_{cs}(4459)$ in the decay of $\Lambda_b\to J/\psi\Lambda\phi$