PoS - Proceedings of Science
Volume 430 - The 39th International Symposium on Lattice Field Theory (LATTICE2022) - Non-zero Temperature
On chiral spin symmetry and the QCD phase diagram
O. Philipsen*, P. Lowdon, L. Glozman and R. Pisarski
Full text: pdf
Pre-published on: February 24, 2023
Published on: April 06, 2023
Abstract
Recently, an approximate $SU(4)$ chiral spin-flavour symmetry was observed in multiplet patterns
of QCD meson correlation functions, in a temperature range above the chiral crossover.
This symmetry is larger than the chiral symmetry of massless QCD, and can only arise effectively
when colour-electric quark-gluon interactions dynamically dominate the quantum effective action.
At temperatures about three times the crossover temperature, these patterns disappear again,
indicating the screening of colour-electric interactions, and the expected chiral symmetry is recovered.
In this contribution we collect independent evidence for such an intermediate temperature range,
based on screening masses and the pion spectral function. Both kinds of observables behave non-perturbatively in this
window, with resonance-like peaks for the pion and its first excitation disappearing gradually with temperature.
Using symmetry arguments and the known behaviour of screening masses at small densities, we discuss
how this chiral spin symmetric band continues into the QCD phase diagram.
DOI: https://doi.org/10.22323/1.430.0189
How to cite

Metadata are provided both in "article" format (very similar to INSPIRE) as this helps creating very compact bibliographies which can be beneficial to authors and readers, and in "proceeding" format which is more detailed and complete.

Open Access
Creative Commons LicenseCopyright owned by the author(s) under the term of the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License.