D0-anti-D0 Mixing and CP Violation in D0 vs anti-D0 to K*(+-) K(-+) Decays

Abstract

The noteworthy BaBar and Belle evidence for $D^0$-${\bar{D}}^0$ mixing motivates us to study its impact on $D^0\to K^{\ast \pm }{K}^{\mp }$ decays and their CP-conjugate processes. We show that both the $D^0$-${\bar{D}}^0$ mixing parameters ($x$ and $y$) and the strong phase difference between ${\bar{D}}^0\to K^{\ast \pm }{K}^{\mp }$ and $D^0\to K^{\ast \pm }{K}^{\mp }$ transitions ($\delta$) can be determined or constrained from the time-dependent measurements of these decay modes. On the $\psi (3770)$ and $\psi (4140)$ resonances at a $\tau$-charm factory, it is even possible to determine or constrain $x$, $y$ and $\delta$ from the time-independent measurements of coherent $(D^0{\bar{D}}^0)\to (K^{\ast \pm }{K}^{\mp })(K^{\ast \pm }{K}^{\mp })$ decays. If the CP-violating phase of $D^0$-${\bar{D}}^0$ mixing is significant in a scenario beyond the standard model, it can also be extracted from the $K^{\ast \pm }{K}^{\mp }$ events.

Comments: 12 pages (2 PS figures included), to be published in Phys. Rev. D as a Rapid Communication