Birdtracks of Exotic SU(N) Color Structures

Abstract

I introduce a systematic procedure for constructing complete and independent sets of interactions of fields transforming under exotic representations of SU(N), in particular the SU(3) gauge group of QCD. It uncovers errors in previous results, starting with interactions of four fields including a single sextet.

Comments: 32 pages LaTeX, 2 figures, 3 tables, 65 color flow diagrams. Revised version, accepted for publication in JHEP