Flavor-Spin Symmetry and the Tensor Charge
  Exploiting an approximate phenomenological symmetry of the $J^{PC}=1^{+-}$ light axial vector mesons and using pole dominance, we calculate the flavor contributions to the nucleon tensor charge. The result depends on the decay constants of the axial vector mesons and their couplings to the nucleons. 
Leonard Gamberg and Gary R. Goldstein