A cutaway view of the MEGA detector showing its parts. The MEGA collaborators are studying one of the mysteries of particle physics, namely: Why is the lepton family number conserved? They are searching for the decay of a muon into an electron and a gamma (photon). This decay would violate the lepton family number conservation law and is forbidden by the Standard Model of the Electro-Weak interaction. (For more information see Cyclotron MEGA Project