Berenstein-Zelevinsky triangles, elementary couplings, and fusion rules

AbstractWe present a general scheme for describing $$\widehat{su}$$ (N)k fusion rules in terms of elementary couplings, using Berenstein-Zelevinsky triangles. A fusion coupling is characterized by its corresponding tensor product coupling (i.e. its Berenstein-Zelevinsky triangle) and the threshold level at which it first appears. We show that a closed expression for this threshold level is encoded in the Berenstein-Zelevinsky triangle and an explicit method to calculate it is presented. In this way, a complete solution of $$\widehat{su}$$ (4)k fusion rules is obtained.