Light meson spectrum and classical symmetries of QCD

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  • 29 June 2006
Abstract
Modern spectroscopic data on light non-strange meson spectrum is analysed. It is argued that the observed regularities of experimental spectrum for highly excited states favour a partial restoration of all approximate classical symmetries of QCD Lagrangian (conformal, chiral and axial) broken by the quantum corrections. As a byproduct the dependence of the resonance widths from the corresponding masses is systematically checked. It shows that the effective string description of radial and orbital excitations, if exists, should be different from that of ground states.

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