Effect of Excited and Fourth Generation Leptons in Lepton Flavor Violating μ− → e- 2γ Decay

We study the lepton flavor violatingμ−→e-2γdecay induced by the mediation of heavy leptons,such as the excited and fourth generation leptons.Effects of these leptons inμ−→e-2γdecay are examined.It is found that the branching ratio of this decay is very sensitive to excited and fourth generation leptons.Furthermore,we obtain the bounds on model parameters by using the current experimental limit of this decay.