CP Violation in τ->νπKₛ and D->πKₛ: The Importance of Kₛ-Kₗ Interference

الأصل · EN

The B-factories have measured CP asymmetries in the τ→πKₛν and D→ Kₛπ modes. The Kₛ state is identified by its decay to two pions at a time that is close to the Kₛ lifetime. Within the Standard Model and many of its extensions, the asymmetries in these modes come from CP violation in K⁰-K⁰ mixing. We emphasize that the interference between the amplitudes of intermediate Kₛ and Kₗ is as important as the pure Kₛ amplitude. Consequently, the measured asymmetries depend on the times over which the relevant decay rates are integrated and on features of the experiment.