Quarks, diquarks and QCD mixing in the $N^*$ resonance spectrum

Details Quarks, diquarks and QCD mixing in the $N^*$ resonance spectrum Quarks, diquarks and QCD mixing in the $N^*$ resonance spectrum

2006-05-31

arxiv.org/abs/hep-ph/0605336v2

Phys.Rev.D74:094014,2006

Physics

High Energy Physics

High Energy Physics - Phenomenology

Extended version accepted by PRD

Scientific paper

10.1103/PhysRevD.74.094014

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 {\bf 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 $J/\psi \to \bar{p}N^*$ are ideal probes of baryon dynamics and for establishing whether strongly correlated diquarks survive for $L > 0$.

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