Light meson spectrum and classical symmetries of QCD
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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
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