Chiral anomaly as a composite operator in the gradient flow exact renormalization group formalism

The gradient flow exact renormalization group (GFERG) is an idea that incorporates gauge invariant flows into the formalism of (ERG). GFERG introduces a Wilson action with cutoff while keeping vector invariance manifestly. details are still to be worked out. In this paper, we apply construct massless Dirac fermions under background chiral fields. By formulating anomaly as ``composite operator,'' make scale manifest. We argue same result extends QCD.