Braided Structure in 4-dimensional conformal Quantum Field Theory
  Higher dimensional conformal QFT possesses an interesting braided structure which, different from the d=1+1 models, is restricted to the timelike region and therefore easily escapes euclidean action methods. It lies behind the spectrum of anomalous dimensions which may be viewed as a kind of substitute for a missing particle interpretation in the presence of interactions. 
Bert Schroer (CBPF Rio de Janeiro)