Anomalous Wtb coupling effects in the weak radiative B-meson decay

TL;DR

This paper investigates how anomalous Wtb couplings, modeled via dimension-six operators, influence the B -> Xs gamma decay rate, providing bounds on related Wilson coefficients within the Standard Model framework.

Contribution

It introduces a gauge-invariant effective field theory approach to analyze anomalous Wtb couplings' effects on B-meson decay, deriving new bounds on Wilson coefficients.

Findings

Bounds on Wilson coefficients of anomalous Wtb couplings

Impact of these couplings on B -> Xs gamma branching ratio

Consistency with Standard Model predictions

Abstract

We study the effect of anomalous Wtb couplings on the B -> Xs gamma branching ratio. The considered couplings are introduced as parts of gauge-invariant dimension-six operators that are built out of the Standard Model fields only. One-loop contributions from the charged-current vertices are assumed to be of the same order as the tree-level flavour-changing neutral current ones. Bounds on the corresponding Wilson coefficients are derived.