RG-Invariant Symmetry Ratio for QCD: A Study of $U(1{)}_A$ and Chiral Symmetry Restoration

Ting-Wai Chiu, Tung-Han Hsieh

We introduce a renormalization-group-invariant (RGI), scheme-independent symmetry ratio $\hat{I}{º}_{AB}$, for the quantitative characterization of symmetry breaking in QCD. As a first app…