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Recent lattice results on Dirac low-mode removed $J=1,2$ mesons and$J=\frac{1}{2}$ baryons reveal the appearance of a new $SU(4)$ symmetry ofconfinement. Here the degeneracy of all $J=2$ iso-vector states within anirreducible representation of $SU(4)$ after low-mode removal is demonstrated.The $SU(4)$ symmetry contains $SU(2)_L \times SU(2)_R$ and $U(1)_A$ symmetriesas subgroups and mixes all compontents $u_L,u_R,d_L,d_R$ of the two-flavorDirac field. It implies the vanishing of the interaction of quarks with thecolor-magnetic field, which is shown by using the QCD Hamiltonian in Coulombgauge.

Testing the $SU(4)$ degeneracy after low-mode removal with $J=2$ mesons