Abstract
We study spatial isovector meson correlators in Nf = 2 QCD with dynamical domain-wall fermions on 323 × 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 Tc 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.
Highlights
The behaviour of strongly interacting matter at high temperatures and its description in the phase diagram of QCD are important questions for a better understanding of the theory as well as for any kind of future applications
The low eigenmodes of the Dirac operator are strongly suppressed at high temperatures [1, 2], which raises the question whether these symmetries occur naturally in the high T spectrum
As we describe in more detail later, we find that all correlators connected by SU(2)L × SU(2)R and U(1)A transformations coincide within small deviations at T > 220 MeV, which means that at these temperatures both chiral symmetries get restored
Summary
The behaviour of strongly interacting matter at high temperatures and its description in the phase diagram of QCD are important questions for a better understanding of the theory as well as for any kind of future applications. It is a priori not clear how two main features of QCD, confinement and chiral symmetry breaking, will behave in regions of higher temperature and/or density. The low eigenmodes of the Dirac operator are strongly suppressed at high temperatures [1, 2], which raises the question whether these symmetries occur naturally in the high T spectrum
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