2002/05/31 by L. Ya. Glozman · 56 citations
Physics and Astronomy · #Chiral symmetry breaking #Geometry #Hadron #High-Energy Particle Collisions Research #Instanton #Meson #Particle physics #Particle physics theoretical and experimental studies #Physics #Quantum Chromodynamics and Particle Interactions #Quantum chromodynamics #Spontaneous symmetry breaking #String (physics) #Symmetry (geometry) #Symmetry breaking #Theoretical physics #hep-ex #hep-lat #hep-ph #nucl-ex #nucl-th
paper · pdf · doi:10.1016/s0370-2693(02)02096-8
published in Physics Letters B 539(3-4), 257-265 (Elsevier BV) · 12 pages, LaTeX. The paper has been expanded and typos have been removed; to appear in Phys. Lett. B
arxiv created 2002/06/08 · openalex publication_date 2002/07/01 · arxiv updated 2014/11/17 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/05
Recent data for highly excited mesons suggest that not only the chiral SU(2)L× SU(2)R symmetry of QCD is restored high in the spectrum but also the U(1)A symmetry. This means that it is not a confining interaction in QCD which triggers the spontaneous breaking of chiral symmetry. The restoration of the U(2)L× U(2)R symmetry of the QCD Lagrangian implies the appearance of multiplets of this group high in the hadron spectra. Such type of multiplets is naturally explained within the string picture of confinement. It also supports the scenario that the U(1)A breaking is related to instantons and not to the gluonic interaction responsible for confinement.