1998/02/28 by Pedro Bicudo · 1 citation
Physics and Astronomy · #Boson #Chiral symmetry breaking #Goldstone boson #High-Energy Particle Collisions Research #Meson #Particle physics #Particle physics theoretical and experimental studies #Physics #Pion #Pseudoscalar #Pseudoscalar meson #Quantum Chromodynamics and Particle Interactions #Scalar (mathematics) #Scalar meson #Symmetry breaking #cond-mat #hep-ph #nucl-th
paper · pdf · doi:10.1103/physrevc.60.035209
published as Phys.Rev.C60:035209,1999 · 17 pages, Revtex, 8 eps figures, and several eps diagrams in equations
arxiv created 1999/01/20 · openalex publication_date 1999/08/12 · arxiv updated 2010/11/15 · openalex created_date 2016/06/24 · openalex updated_date 2026/08/05
We introduce coupled channels of ladder Bethe-Salpeter mesons both in the bound state equation for mesons and in the mass gap equation for chiral symmetry. Consistency is insured by the Ward identities for axial currents, which preserve the Goldstone boson nature of the pion and prevent a systematic shift of the hadron spectrum. We study the decay of a scalar meson coupled to a pair of pseudoscalars. We also show that coupled channels reduce the breaking of chiral symmetry, with the same Feynman diagrams that appear in the coupling of a scalar meson to a pair of pseudoscalar mesons. Exact calculations are performed in a particular confining quark model, where we find that the ground state I=0, 3P0 qq meson is the f0(980) with a partial decay width of 40 MeV. We also find a 30% reduction of the chiral condensate due to coupled channels.