The Search for the Decay of Z Boson into Two Gammas as a Test of Bose   Statistics
  We suggest that Bose statistics for photons can be tested by looking for decays of spin-1 bosons into two photons. The experimental upper limit on the decay $Z \rightarrow \gamma \gamma $ is used to establish for the first time the quantitative measure of the validity of Bose symmetry for photons. 
A.Yu.Ignatiev, G.C.Joshi and M.Matsuda