SU(4) symmetry of the dynamical QCD string and genesis of hadron spectra
Abstract
A large degeneracy of mesons of a given spin has recently been discovered upon reduction of the quasi-zero modes of the Dirac operator in a dynamical lattice simulation. Here a symmetry group that is responsible for this degeneracy is established, which is SU(4) ⊃ SU(2)L × SU(2)R × U(1)A × Ci. It is argued that this symmetry group is a symmetry of the dynamical QCD string. Implications of this picture for a genesis of light hadron spectra are discussed.
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