Exploring New Physics with CP Violation in Neutral D and B Decays

Abstract

If New Physics contributes significantly to neutral meson mixing, then it is quite likely that it does so in a CP violating manner. In $D^0-\bar D^0$ mixing measured through $D^0\rightarrow K^+\pi^-$, CP violation induces a term $\propto te^{-\Gamma t}$ with important implications for experiments. For $B_s-\bar B_s$ mixing, a non-vanishing CP asymmetry (above a few percent) $a_{CP}(B_s \rightarrow D_s^+ D_s^-)$ is a clear signal of New Physics. Interestingly, this would test precisely the same Standard Model ingredients as the question of whether $\alpha+\beta+\gamma=\pi$.