Anomalies in quantum field theory: Properties and characterization

TL;DR

This paper provides an algebraic characterization and explicit evaluation of the Adler-Bardeen anomaly in gauge theories, demonstrating scheme independence, and explores its implications in supersymmetric theories including anomalous supersymmetry breaking.

Contribution

It offers a novel algebraic framework for the Adler-Bardeen anomaly, extends the gauge coupling concept, and analyzes anomaly effects in supersymmetric models.

Findings

An explicit scheme-independent evaluation of the Adler-Bardeen anomaly.

Proof of the non-renormalization theorem for the anomaly.

Identification of anomalous supersymmetry breaking in one-loop corrections.

Abstract

We consider the Adler-Bardeen anomaly of the U(1) axial current in abelian and non-abelian gauge theories and present its algebraic characterization as well as an explicit evaluation proving regularization scheme independence of the anomaly. By extending the gauge coupling to an external space-time dependent field we get a unique definition for the quantum corrections of the topological term. It also implies a simple proof of the non-renormalization theorem of the Adler-Bardeen anomaly. We consider local gauge couplings in supersymmetric theories and find that there the renormalization of the gauge coupling is determined by the topological term in all loop orders except for one loop. It is shown that in one-loop order the quantum corrections to the topological term induce an anomalous breaking of supersymmetry, which is characterized by similar properties as the Adler-Bardeen anomaly.