Parafermionic chiral algebra Z3 with the dimension of the principal parafermion fields ψ(z), ψ+(z), Δψ=8/3

We analyze, and prove, the associativity of the new Z3 parafermionic chiral algebra which has been announced some time ago, with principal parafermionic fields having the conformal dimension Δψ=8/3. In doing so we have developed a new method for analyzing the associativity of a given chiral algebra of parafermionic type, the method which might be of a more general significance than a particular conformal field theory studied in detail in this paper. Still, even in the context of our particular chiral algebra, of Z3 parafermions with Δψ=8/3, the new method allowed us to give a proof of associativity which we consider to be complete.