Light meson spectrum and classical symmetries of QCD
Departament d'Estructura i Constituents de la Matèria and CER for Astrophysics, Particle Physics and Cosmology, Universitat de Barcelona, 647 Diagonal, 08028, Spain
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Accepted: 5 August 2006
Published online: 15 September 2006
Modern spectroscopic data on the light non-strange meson spectrum is analyzed. It is argued that the observed regularities of the experimental spectrum for highly excited states favour a partial restoration of all approximate classical symmetries of a QCD Lagrangian (conformal, chiral and axial) broken by quantum corrections. The rate of restoration of classical symmetries is estimated. The dependence of the resonance widths on the corresponding masses is systematically checked. On average, it turns out to be universal for high excitations as predicted by the effective string description.
PACS: 12.38.Aw General properties of QCD (dynamics, confinement, etc.) – / 12.38.Qk Experimental tests – / 14.40.-n Mesons –
© Società Italiana di Fisica and Springer-Verlag, 2006