Some Possibilities for Charm Studies at B-factories

The gradual and painstaking determination of the CKM matrix over a long period of time is a remarkable accomplishment of our field, and hopefully it will attain a level of completion from the B-factory studies to come. The emphasis of B-factories will be on the physics of b quarks and deservedly so. Already, there is discovery of a ∆B = 2 process (Bd−Bd mixing) and an EW-penguin decay (B → K γ). The future observation of CP violations (CPV) in B decays would top the list. However, B factories will provide opportunities for doing c quark studies as well. I would hope that the following items be given some consideration in the planning now underway: • Search for flavor-changing neutral current (FCNC) charm decays, especially D → Mγ (M denotes a J > 0 non-charm meson), D → M ll (M ′ denotes a non-charm meson), • Tighten the limit on CPV asymmetries in D decay, • Tighten the limit on D − D̄ mixing.