Spinon Basis for Higher Level Su (2) Wzw Models

We propose a spinon basis for the integrable highest weight modules of ŝl2 at levels k ≥ 1, and discuss the underlying Yangian symmetry. Evaluating the characters in this spinon basis provides new quasiparticle type expressions for the characters of these integrable modules, and explicitly exhibits the structure of an RSOS times a Yangian part, known e.g. from S-matrix results. We briefly discuss generalizations to other groups and more general conformal field theories.