Quarks, diquarks and QCD mixing in the $N^{\ast }$ resonance spectrum

Abstract

We identify a "$\Lambda$ selection rule" for $N^{\ast }$ 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 $\gamma N\to K\Lambda$, $K^{\ast }\Lambda$, $K\Sigma$, $K^{\ast }\Sigma$, and $J/\psi \to \bar{p}{N}^{\ast }$ are ideal probes of baryon dynamics and for establishing whether strongly correlated diquarks survive for $L>0$.

arXiv commentExtended version accepted by PRD

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• Diquarks and Exotic Spectroscopy
• A Diquark-Triquark Model for the KN Pentaquark
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Cited by in corpus (12)

• $\eta$ photoproduction on the quasi-free nucleons in the chiral quark model
• Study of π^{-}p \to ηn at low energies in a chiral constituent quark model
• The $K^{-}p\to {\Sigma }^0{\pi }^0$ reaction at low energies in a chiral quark model
• Neutral pion photoproduction on the nucleon in a chiral quark model
• Low energy reactions $K^{-}p\to {\Sigma }^0{\pi }^0$, $\Lambda {\pi }^0$, ${\bar{K}}^{0}n$ and the strangeness $S=-1$ hyperons
• Complementary studies on $N^{\ast }$ from $e^{+}{e}^{-}$, $pp$ and $p\bar{p}$ collisions
• Low energy reaction $K^{-}p\to \Lambda \eta$ and the negative parity $\Lambda$ resonances
• Combined analysis of the ${\pi }^{-}p\to K^0\Lambda$, $\eta n$ reactions in a chiral quark model
• Configuration Mixing of Quark States in Baryons
• Proposal and theoretical formalism for studying baryon radiative decays from J/ψ\to B^*\bar B + \bar{B^*}B \to γB\bar B
• Selection rules and quark correlations in the $N^{\ast }$ resonance spectrum
• Understanding the 1P- and 2S-wave nucleon resonances within the extended Lee-Friedrichs Model