On chiral spin symmetry and the QCD phase diagram

  • 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.

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Author:Owe PhilipsenORCiDGND, Leonid Ya. Glozman, Peter LowdonORCiDGND, Robert D. PisarskiORCiD
ArXiv Id:http://arxiv.org/abs/2211.11628
Document Type:Conference Proceeding
Date of Publication (online):2022/11/30
Date of first Publication:2022/11/30
Publishing Institution:Universit├Ątsbibliothek Johann Christian Senckenberg
Contributing Corporation:International Symposium on Lattice Field Theory (39. : 2022 : Bonn)
Release Date:2023/01/24
Page Number:10
Institutes:Physik / Physik
Dewey Decimal Classification:5 Naturwissenschaften und Mathematik / 53 Physik / 530 Physik
Licence (German):License LogoCreative Commons - CC BY-NC-ND - Namensnennung - Nicht kommerziell - Keine Bearbeitungen 4.0 International