$B_d-\bar{B}_d$ mixing vs. $B_s-\bar{B}_s$ mixing with the anomalous $Wtb$ couplings

TL;DR

This paper investigates how anomalous $tbW$ couplings influence $B_d$ and $B_s$ meson mixing, using combined experimental data to set constraints on top quark interactions beyond the Standard Model.

Contribution

It provides the first comprehensive analysis of anomalous $tbW$ couplings' effects on both $B_d$ and $B_s$ mixing, deriving stronger bounds from $B_d$ data.

Findings

The $B_d$ mixing data yields stronger bounds on anomalous couplings than $B_s$ data.

Combined analysis constrains top quark anomalous couplings more effectively.

Results improve understanding of new physics effects in flavor-changing processes.

Abstract

We explore the effects of the anomalous $tbW$ couplings on the $\bd$ mixing and recently measured $\bs$ mixing. The combined analysis of mixings via box diagrams with penguin decays provides strong constraints on the anomalous top quark couplings. We find the bound from the $\bd$ mixing data is stronger than that from the $\bs$ mixing.