Isospin Recoupling and Bose-Einstein Pion Correlations in   Nucleon-Antinucleon Annihilations
  We study the effect of isospin projections on a two source picture of coherent pions coming from nucleon-antinucleon annihilation. We show that important Hanbury-Brown Twiss correlations among like charge pion pairs compared with unlike arise from these isospin projections. 
R. D. Amado, F. Cannata, J-P. Dedonder, M. P. Locher, and Yang Lu