We identify a “$\Lambda$ selection rule” for $N^{*}$ resonances in the presence of QCD mixing effects. We quantify these mixing effects from existing data and predict amplitudes for exciting $\mathbf{20}$ representations in SU(6), which are forbidden in strict diquark models. By classifying Particle-Data-Group (PDG) states at $N=2$, we show that $\gamma N\to K\Lambda$, $K^{*}\Lambda$, $K\Sigma$, $K^{*}\Sigma$, and $J/\psi \to \overline{p}{N}^{*}$ are ideal probes of baryon dynamics and for establishing whether strongly correlated diquarks survive for $L>0$.

• Received 10 March 2006

DOI:https://doi.org/10.1103/PhysRevD.74.094014