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

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 sin2β 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.