Large CP Violation in B_s mixing and Implications for D Mixing
Abstract
The measured B_s mixing could be on the low side. It could arise from destructive interference between t and t' with 4 generations, for example with m_{t'} \sim 300 GeV and V_{t's}^*V_{t'b} \sim 0.025 e^{\pm i 70^\circ}, which gives b \to s\ell^+\ell^- rate consistent with data. This could underly the new physics indications in CP violation measurements in b \to s\bar qq transitions, which select the positive phase. We predict that \sin 2\Phi_{B_s} \sim -0.5 to -0.7, i.e. CP violation in B_s mixing should be large and negative. As a corollary, D^0 mixing, \Delta m_{D}, is predicted to be at the current level of sensitivity, but with CP violation only at -0.2 level. These predictions can be tested in the next few years.Keywords
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