A suggestion for investigating electron-muon and electron-pion scattering with electron-positron colliding beams

We show that it is possible, in principle, to study the scattering between an "almost real" muon or pion and an electron in an e– e+ colliding beam experiment where one large-angle electron and one large-angle muon or pion would be measured in the final state. In the muon case, the counting rate should be high enough to allow this experiment to be performed with electron-positron storage rings of the next generation.