Searching for the quark--diquark systematics of baryons composed by light quarks $q=u,d$

Abstract

Supposing quark--diquark structure of baryons, we look for systematics of baryons composed of light quarks ($q=u,d$). We systematize baryons using the notion of two diquarks: (i) axial--vector state, $D_1^1$, with the spin $S_D=1$ and isospin $I_D=1$ and (ii) scalar one, $D_0^0$, with the spin $S_D=0$ and isospin $I_D=0$. We consider several schemes for the composed baryons: (1) with different diquark masses, $M_{D_0^0}\ne M_{D_1^1}$, (2) with $M_{D_0^0}=M_{D_1^1}$ and overlapping $q{D}_0^0$ and $q{D}_1^1$ states (resonances), (3) with/without SU(6) constraints for low-lying states (with quark--diquark orbital momenta L=0). In the high-mass region the model predicts several baryon resonances at $M\sim 2.0-2.9$ GeV. Moreover, the model gives us the double pole structure (i.e. two poles with the same Re$M$ but different Im$M$) in many amplitudes at masses $M\ga 2.0$ GeV. We see also that for description of low-lying baryons (with L=0), the SU(6) constraint is needed.

30 pages, 9 figures

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