Charm physics -- The theory case for a new generation of experiments

The author discusses charm decays, lifetimes, and branching ratios, in terms of what is known today, by theory and experiment, and what could be learned from a new facility. A Tau Charm Factory will allow the advantage of lower standard model backgrounds in looking at charm particle decays. Questions the author feels are open include lifetimes of B, Λ, and Ξ particles, their branching ratios in SL and NL decays, and rare decay modes. Also the possibility to study D0-bar D0 oscillations, and studies of CP violation effects. The author argues the primary purpose of such a facility would allow study of QCD in novel environments under controlled laboratory conditions. One can study charm and lepton decays, charmonium spectroscopy, and light quark/gluonia spectroscopy. In addition the facility opens the possibility of finding new physics in any of these systems