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 m(t), 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' readily provides a needed perturbation (approximate to 15%) to sin2 beta as measured in B -> psi Ks and simultaneously is the dominant Source of CP asymmetry in B-s -> psi phi. The correlation between CP asymmetries in B-s -> psi phi and B -> psi Ks suggests m(t)' approximate to (400-600) GeV. Such heavy masses point to the tantalizing possibility that the 4th family plays an important role in the electroweak symmetry breaking. (C) 2009 Elsevier B.V. All rights reserved.