Patterns and Partners for chiral symmetry restoration

26 Jun 2017, 13:00


Ángel Gómez Nicola (Universidad Complutense Madrid)


The nature of chiral symmetry restoration and the identification of its correct pattern in terms of $O(4)$ and $U(1)_A$ restoration are central problems for our present understanding of the QCD phase diagram, which are not fully settled in lattice simulations. We will present a theoretical analysis based on Ward Identities which sheds light on this issue and where partner degeneration is systematically studied and connected with physical processes for the full scalar/pseudoscalar $U(3)$ meson nonets. Model-independent results are derived, which in addition allow to understand the temperature dependence of lattice screening masses through particular quark condensate combinations. Their realization in $U(3)$ Chiral perturbation Theory will also be described. Special attention will be paid to the role of the thermal $f_0(500)$ state to describe lattice data for the scalar susceptibility through thermal corrections to its pole parameters generated from unitarized pion scattering.

Primary author

Ángel Gómez Nicola (Universidad Complutense Madrid)


Dr Jacobo Ruiz de Elvira (HISKP, Bonn University)

Presentation Materials