SU(3) Mixing for Excited Mesons
  The SU(3)-flavor symmetry breaking and the quark-antiquark annihilation mechanism are taken into account for describing the singlet-octet mixing for several nonets assigned by Particle Data Group(PDG). This task is approached with the mass matrix formalism. 
W.S. Carvalho, A.S. de Castro, A.C.B. Antunes