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The LHCb has discovered two new states with preferred $J^P$ quantum numbers$3/2^-$ and $5/2^+$ from $\Lambda_b$ decays. These new states can beinterpreted as hidden charm pentaquarks. It has been argued that the mainfeatures of these pentaquarks can be described by diquark model. The diquarkmodel predicts that the $3/2^-$ and $5/2^+$ are in two separate octetmultiplets of flavor $SU(3)$ and there is also an additional decupletpentaquark multiplet. Finding the states in these multiplets can providecrucial evidence for this model. The weak decays of b-baryon to a light mesonand a pentaquark can have Cabibbo allowed and suppressed decay channels. Wefind that in the $SU(3)$ limit, for $U$-spin related decay modes the ratio ofthe decay rates of Cabibbo suppressed to Cabibbo allowed decay channels isgiven by $|V_{cd}|^2/|V_{cs}|^2$. There are also other testable relations forb-baryon weak decays into a pentaquark and a light pseudoscalar. Theserelations can be used as tests for the diquark model for pentaquark.

Some Predictions of Diquark Model for Hidden Charm Pentaquark Discovered at the LHCb