Light quarks at finite temperature: chiral restoration and the fate of the $U(1{)}_A$ symmetry

Abstract

We review recent results on the role of light quark states within the QCD phase diagram. In particular, we will discuss how the combined use of theoretical techniques such as Effective Theories, Unitarization and Ward Identities helps to shed light on several important issues regarding chiral symmetry restoration, building bridges with recent lattice analyses. Special attention will be paid to the role of chiral and $U(1{)}_A$ partners in the interplay between those symmetries, which is crucial to properly understand the transition pattern. Light scalar mesons at finite temperature will be shown to be responsible for the description of susceptibilities encoding chiral and $U(1{)}_A$ restoration properties.

Invited review paper submitted to European Physical Journal Special Topics. 18 pages, 11 figures. Version accepted for publication

References in corpus (16)

• Color superconductivity in dense quark matter
• The equation of state in (2+1)-flavor QCD
• The QCD transition temperature: results with physical masses in the continuum limit II.
• Additional Strange Hadrons from QCD Thermodynamics and Strangeness Freeze-out in Heavy Ion Collisions
• Can stochastic quantization evade the sign problem? -- the relativistic Bose gas at finite chemical potential
• Meson screening masses from lattice QCD with two light and the strange quark
• Scalar-pseudoscalar meson behavior and restoration of symmetries in SU(3) PNJL model
• In-Medium Spectral Functions of Vector- and Axial-Vector Mesons from the Functional Renormalization Group
• On the strength of the $U_A(1)$ anomaly at the chiral phase transition in $N_f=2$ QCD
• Topology and axions in QCD
• Scalar susceptibilities and four-quark condensates in the meson gas within Chiral Perturbation Theory
• Fate of the ${\eta }^{\prime }$ in the Quark Gluon Plasma
• Topology in the SU(Nf) chiral symmetry restored phase of unquenched QCD and axion cosmology
• Isospin Breaking and chiral symmetry restoration
• QCD phase transition in the chiral limit
• The role of strangeness in chiral and $U(1{)}_A$ restoration

Cited by in corpus (3)

• The pion-kaon scattering amplitude and the $K^0(700)$ and $K^{\ast }(892)$ resonances at finite temperature
• What is chiral susceptibility probing?
• The QCD scalar susceptibility and thermal scalar resonances in chiral symmetry restoration