Canonical Quantization of Scalar Fields — Mark Srednicki
Physics — QFT · standard-model-quark-sector
Problem
Show that the Standard Model is anomaly free. Hint: you must consider 3--3--3, 2--2--2, 3--3--1, 2--2--1, and 1--1--1 anomalies, where the number denotes the gauge group of one of the external gauge fields in the triangle diagram. Why do we not need to worry about the unlisted combinations?