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

TL;DR

Introducing a fourth quark family with masses between 400-600 GeV offers a simple explanation for observed anomalies in B-CP asymmetries, linking new physics to electroweak symmetry breaking.

Contribution

Proposes that a fourth quark family explains CP asymmetry anomalies and connects to electroweak symmetry breaking, with specific mass range predictions.

Findings

Fourth family explains CP asymmetry patterns

Mass range of 400-600 GeV for the new quarks

Correlation between CP asymmetries in different B decays

Abstract

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$\times$4 mixing matrix is such that the $t'$ readily provides a needed {\it perturbation} ($\approx 15%$) to $\sin 2 \beta$ as measured in $B \to \psi K_s$ and simultaneously is the dominant source of CP asymmetry in $B_s \to \psi \phi$. The correlation between CP asymmetries in $B_s \to\psi \phi$ and $B_d\to\phi K_s$ suggests $m_{t'} \approx$ (400 - 600) GeV. Such heavy masses point to the tantalizing possibility that the 4th family plays an important role in the electroweak symmetry breaking.