Charm Tagging in Heavy Particles Decays at SLC and LEP: A Large Window on New Physics

A new, high-efficiency technique for tagging charm quarks in heavy particle decays produced at the 2’ is described. This technique is based on inclusive D** counting, using the special kinematic properties of the decay D** + T* Do. The importance of charm tagging in the discovery and/or identification of new heavy particles such as a heavy quark or a Higgs boson is illustrated. Submitted to Nuclear Physics * This work was supported in part by the Department of Energy, contract DEAC03-76SF00515. a On leave of absence from the Laboratoire de 1’Accdlkrateur Lindaire, 91405 Orsay, France.