Resonances <math><mi>X</mi><mo>(</mo><mn>4140</mn><mo>)</mo></math>, <math><mrow><mi>X</mi><mo>(</mo><mn>4160</mn><mo>)</mo></mrow></math>, and <math><mrow><msub><mrow><mi>P</mi></mrow><mrow><mi>c</mi><mi>s</mi></mrow></msub><mo>(</mo><mn>4459</mn><mo>)</mo></mrow></math> in the decay of <math><mrow><msub><mrow><mi>Λ</mi></mrow><mrow><mi>b</mi></mrow></msub><mo>→</mo><mi>J</mi><mo>/</mo><mi>ψ</mi><mi>Λ</mi><mi>ϕ</mi></mrow></math>

We study the decay of Λb→J/ψΛϕ by taking into account the intermediate resonances X(4140), X(4160), and Pcs(4459). In addition to the peak of the X(4140), we also find a bump structure around 4160 MeV followed by a cusp structure around Ds*D&#175;s* threshold in the J/ψϕ invariant mass distribution of the Λb→J/ψΛϕ process, which can be associated to the Ds*D&#175;s* molecular state X(4160). We also show that this reaction can also be used to confirm the existence of the hidden-charm pentaquark Pcs(4459) with strangeness. We predict an enhancement structure close to the threshold in the Ds*D&#175;s* invariant mass distribution of the Λb→Ds*D&#175;s*Λ process, which is the reflection of the X(4160) and should not be misidentified with a new resonance. We strongly suggest experimentalists to further measure these processes, which can be useful to clarify the nature of X(4140) and X(4160) resonances, and to confirm the existence of the Pcs(4459).