Productions and decays of short-lived particles in e+-e- colliding beam experiments

We investigated productions and decays of short-lived particles (e.g., heavy leptons, charmed hadrons and so on) in e+-e- colliding beam experiments. Formulae which are useful for computing the cross section for the production and subsequent decay of a single or a pair of narrow-width particles with spin ½ are derived. Approximate but analytical expressions for the combined angular distribution of the decay products from such particles are derived. The production and decay of a single excited muon is also treated.