Production of 
Pc
 states from 
Λb
 decay
In the present work, we investigate Pc(4312), Pc(4440), and Pc(4457) production from Λb decay in a molecular scenario by using an effective Lagrangian approach. We predict the ratio of the branching fraction of Λb→PcK, which is weakly dependent on our model parameter. We also find the ratios of the productions of the branching fractions of Λb→PcK and Pc→J/ψp can be well interpreted in the molecular scenario. Moreover, the estimated branching fractions of Λb→PcK are of order 10-6, which could be tested by further measurements by the LHCb Collaboration.