The fourth family: A simple explanation for the observed pattern of anomalies

We show that a fourth family of quarks with mt(prime) 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 x 4 mixing matrix is such that the t(prime) readily provides a needed perturbation (∼15%) to sin2β as measured in B → ψ Ks and simultaneously is the dominant source of CP asymmetry in Bs → ψφ. The correlation between CP asymmetries in Bs → ψφ and Bd → φKs suggests m(prime)t ∼ (400-600) GeV. Such heavy masses point to the tantalizing possibility that the 4th family plays an important role in the electroweak symmetry breaking.