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 .