2007/07/09 by Ignacio J. General, Ping Wang, Stephen R. Cotanch +2
Physics and Astronomy · #Bound state #Cold Atom Physics and Bose-Einstein Condensates #Coulomb #Exotic hadron #Gauge (firearms) #Meson #Nuclear physics #Particle physics #Particle physics theoretical and experimental studies #Physics #Quantum Chromodynamics and Particle Interactions #Quantum chromodynamics #Resonance (particle physics) #State (computer science) #Tetraquark #hep-ph
paper · pdf · doi:10.1016/j.physletb.2007.08.015
published as Phys.Lett.B653:216-223,2007 · 12 pages, 8 figures
arxiv created 2007/07/09 · openalex publication_date 2007/08/14 · arxiv updated 2009/12/01 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/06
Highlights in the search for nonconventional (non qqbar) meson states are the pi1(1400) and pi1(1600) exotic candidates. Should they exist, mounting theoretical arguments suggest that they are tetraquark molecular resonances excitable by meson rescattering. We report a new tetraquark calculation within a model field theory approximation to Quantum Chromodynamics in the Coulomb gauge supporting this conjecture. We also strengthen this claim by consistently contrasting results with exotic state predictions for hybrid (q qbar g) mesons within the same theoretical framework. Our findings confirm that molecular-like configurations involving two color singlets (a resonance, not a bound state) are clearly favored over hybrid or color-exotic tetraquark meson (q qbar q qbar atoms) formation. Finally, to assist needed further experimental searches we document a useful off-plane correlator for establishing the structure of these exotic systems along with similar, but anticipated much narrower, states that should exist in the charmonium and bottomonium spectra.