Abstract :
Within the standard electroweak model we carry out an instructive analysis of the effect of K0 - K0 mixing on CP asymmetries in some weak decay modes of D± and BdO mesons. We point out that a clean signal of CP violation with magnitude of 2Re(ϵ) ≈ 3.3 × 10−3 can manifest itself in the semileptonic decays D+ → l+ νl KS (KL) vs D− → l−νl KS (KL). The CP asymmetries are also dominated by 2Re(ϵ) in the two-body nonleptonic decays D± → (π±,ϱ±,a1± + (KS, KL) and in the multi-body processes D± → π± + n0π0 + n±(π±π∓ + (KS, KL), where n0 and n± are integers. It is possible to observe such CP-violating signals with about 107 D± events at τ-charm factories or hadron machines. Finally we show that the CP asymmetry induced by Re(ϵ) may compete with those from Bd0 - Bd0 mixing and final-state interactions in the semi-inclusive and exclusive decays Bd → X(cc) + (KS,KL) on the Y(4S) resonance.
