Measurements from KTeV of Rare Decays of the K_L and pi^0
  The KTeV collaboration at Fermi National Accelerator Laboratory has recently completed searches for and measurements of several decay modes of the neutral kaon and pion. These include new searches for lepton flavor violating decays (which have not been seen), and a new study of the parity properties of the decay pi^0 -> e^+e^-e^+e^-. 
E. D. Zimmerman