The fourth family: a simple explanation for the observed pattern of anomalies in B-CP asymmetries

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We show that a fourth family of quarks with mₜ' in the range of (400 - 600) GeV provides a rather simple explanation for the several indications of new physics that have been observed involving CP asymmetries of the b-quark. The built-in hierarchy of the 4×4 mixing matrix is such that the t' readily provides a needed perturbation (≈ 15%) to 2 β as measured in B → ψKₛ and simultaneously is the dominant source of CP asymmetry in Bₛ → ψϕ. The correlation between CP asymmetries in Bₛ →ψϕ and Bd→ϕKₛ suggests mₜ' ≈ (400 - 600) GeV. Such heavy masses point to the tantalizing possibility that the 4th family plays an important role in the electroweak symmetry breaking.