Symmetries of mesons after unbreaking of chiral symmetry and their string interpretation

Using the chirally invariant overlap Dirac operator, we remove its lowest-lying quasizero modes from the valence quark propagators and study evolution of isovector mesons with J=1. At the truncation level, about 50 MeV SU (2) ₋ (2) ₑ and U (1) ₀ symmetries get restored. However, we observe a degeneracy not only within the chiral and U (1) ₀ multiplets, but also a degeneracy of all possible chiral multiplets, i. e. , the observed quantum levels have a symmetry larger than U (2) ₋ (2) ₑ and their energy does not depend on the spin orientation of quarks and their parities. We offer a possible interpretation of these energy levels as the quantum levels of the dynamical QCD string. The structure of the radial J=1 spectrum is compatible with E= (nₑ+1) with =90070 MeV.