Mixing and Decay Constants of Pseudoscalar Mesons: The Sequel
  We present further tests and applications of the new eta-eta' mixing scheme recently proposed by us. The particle states are decomposed into orthonormal basis vectors in a light-cone Fock representation. Because of flavor symmetry breaking the mixing of the decay constants can be identical to the mixing of particle states at most for a specific choice of this basis. Theoretical and phenomenological considerations show that the quark flavor basis has this property and allows, therefore, for a reduction of the number of mixing parameters. A detailed comparison with other mixing schemes is also presented. 
T. Feldmann (U Wuppertal), P. Kroll (U Wuppertal and U Adelaide), and   B. Stech (U Heidelberg)