2004/03/08 by M. Napsuciale, Mauro Napsuciale, S. Rodríguez +1 · 6 citations
Physics and Astronomy · #High-Energy Particle Collisions Research #Meson #Particle physics #Particle physics theoretical and experimental studies #Physics #Pseudoscalar #Quantum Chromodynamics and Particle Interactions #Quark #hep-ph
paper · pdf · open access · doi:10.1016/j.physletb.2004.10.018
published in Physics Letters B 603(3-4), 195-202 (Elsevier BV) · 8 pages, 3 figures
arxiv created 2004/03/08 · openalex publication_date 2004/10/24 · arxiv updated 2009/12/01 · openalex created_date 2016/06/24 · openalex updated_date 2026/08/05
We point out that meson spectrum indicates the existence of a degenerate chiral nonet in the energy region around 1.4GeV with a slightly inverted spectrum with respect to a q¯q nonet. Based on this observation and the approximately linear rising of the mass of a hadron with the number of constituent quarks we conjecture the existence of a tetraquark chiral nonet in this energy region with chiral symmetry implemented directly. We realize this idea in a chiral model and take into account the mixing of the tetraquark chiral nonet with a conventional q¯q nonet. We find that the mass spectrum of mesons below 1.5GeV is consistent with this picture. In general, pseudoscalar states arise as mainly q¯q states but scalar states turn out to be strong admixtures of q¯q and tetraquark states.