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

Understand

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 be interpreted as hidden charm pentaquarks.
• It has been argued that the main features of these pentaquarks can be described by diquark model.
• The diquark model predicts that the $3/2^-$ and $5/2^+$ are in two separate octet multiplets of flavor $SU(3)$ and there is also an additional decuplet pentaquark multiplet.