High Scale Study of Possible Bd → ϕKs CP Physics

Some rare decay processes are particularly sensitive to physics beyond the Standard Model (SM) because they have no SM tree contributions. We focus on one of these, B_d → ϕK_s. Our study is in terms of the high scale effective theory, and high scale models for the underlying theory, while previous studies have been focusing on the low scale effective Lagrangian. We show that models with family dependent Kähler potential can provide large non-SM CP effects to the B_d → ϕK_s process.