engleski

Tied chiral and U_A(1) symmetry breaking and restoration at T>0 , and η' and η at RHIC

We find that the U_A(1) symmetry breaking is so closely tied to the Dynamical Chiral Symmetry Breaking, that the restoration of chiral symmetry must lead to the restoration of U_A(1) symmetry at least partially, on the level of the mass of the predominantly singlet η' meson. The gradual crossover melting of the massive quark-antiquark condensates leads to the similar behavior of the topological susceptibility and the topological charge parameter. Then, η does not exhibit any mass drop at all, in contrast to η'. The significant drop of the η' mass signals the partial restoration of U_A(1)symmetry.

Chiral and U_A(1) symmetries of QCD ; Dynamical Chiral Symmetry Breaking ; U_A(1) symmetry breaking ; crossover transition and restoration at high temperature

Link/poveznica znanstvenog skupa je http://pyweb.swan.ac.uk/~aarts/thor-lisboa.html