2010/01/08 by A. V. ANISOVICH, A. V. Anisovich, V. V. Anisovich +9 · 17 citations
Physics and Astronomy · #Baryon #Diquark #Isospin #Lambda baryon #Particle physics theoretical and experimental studies #Quantum Chromodynamics and Particle Interactions #Quantum and Classical Electrodynamics #Quark #Quark model #Scalar (mathematics) #hep-ph
paper · pdf · doi:10.1142/s0217751x10049050
published in International Journal of Modern Physics A 25(15), 2965-2995 (World Scientific) · 30 pages, 9 figures
arxiv created 2010/01/08 · openalex publication_date 2010/06/20 · arxiv updated 2014/11/20 · openalex created_date 2016/06/24 · openalex updated_date 2026/08/05
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, [Formula: see text], with the spin S D = 1 and isospin I D = 1 and (ii) scalar one, [Formula: see text], with the spin S D = 0 and isospin I D = 0. We consider several schemes for the composed baryons: (1) with different diquark masses, [Formula: see text], (2) with [Formula: see text] and overlapping [Formula: see text] and [Formula: see text] 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 ~ 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 ≳ 2.0 GeV . We see also that for description of low-lying baryons (with L = 0), the SU(6) constraint is needed.