Birdtracks for SU(N)

Abstract

I gently introduce the diagrammatic birdtrack notation, first for vector algebra and then for permutations. After moving on to general tensors I review some recent results on Hermitian Young operators, gluon projectors, and multiplet bases for SU(N) color space.

Comments: Lecture notes for the QCD Master Class 2017, https://indico.cern.ch/event/547800/, 18-24 June 2017, Saint-Jacut-de-la-Mer, France; introduction added, minor corrections