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  1. Pentaquark

    Linked via "Large Hadron Colliderb (LHCb)"

    The $P_c$ States (First Generation)
    The first widely accepted evidence for pentaquarks came from the Large Hadron Colliderb (LHCb)/) experiment in 2015, detecting resonant structures in the decay chain of the $\Lambdab^0$ baryon. These were designated $Pc(4380)^+$ and $P_c(4450)^+$.
    The measured masses were approximately: