D0 → K±π∓ and CP violation at a τ-charm factory

We calculate the time-dependent and time-integrated decay rates of (D0D0) → (K±π∓)(l±X∓) at the ψ(3.77) and ψ(4.14) resonances. The possibilities to distinguish between the effects of D0−D0 mixing and doubly Cabibbo suppressed decay (DCSD) are illustrated, and the signal of CP violation induced by the interplay of mixing and DCSD is discussed. Ratios of the decay rates of (D0D0) → (K±π∓)(K±π∓) to that of (D0D0) → (K+π−)(K−π+) are also recalculated by accommodating CP violation and final-state interactions.