Degeneracy of Vector-Channel Spatial Correlators in High Temperature QCD

We study spatial isovector meson correlators in N_f=2 QCD with dynamical domain-wall fermions on 32^3× 8 lattices at temperatures up to 380 MeV with various quark masses. We measure the correlators of spin-one isovector operators including vector, axial-vector, tensor and axial-tensor. At temperatures above T_c we observe an approximate degeneracy of the correlators in these channels, which is unexpected because some of them are not related under SU(2)_L × SU(2)_R nor U(1)_A symmetries. The observed approximate degeneracy suggests emergent SU(2)_CS (chiral-spin) and SU(4) symmetries at high T.