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 ${32}^3\times 8$ 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 $SU(2{)}_L\times SU(2{)}_R$ nor $U(1{)}_A$ symmetries. The observed approximate degeneracy suggests emergent $SU(2{)}_{CS}$ (chiral-spin) and $SU(4)$ symmetries at high $T$.