Anomalous Couplings of the Third Generation in Rare B Decays

TL;DR

This paper investigates how anomalous couplings of third-generation quarks could significantly alter rare B decay processes, especially dilepton modes, even within existing experimental constraints.

Contribution

It introduces the effects of dimension-five operators on rare B decays and demonstrates their potential to cause large deviations from the Standard Model predictions.

Findings

Dimension-five operators can induce large deviations in dilepton modes.

Constraints from $b o s extgamma$ and electroweak data still allow significant new physics effects.

Potential for observable deviations in rare B decays in future experiments.

Abstract

We study the potential effect of anomalous couplings of the third generation quarks to gauge bosons in rare B decays. We focus on the constraints from flavor changing neutral current processes such as $b\to s\gamma$ and $b\to s \ell^+\ell^-$. We consider both dimension-four and dimension-five operators and show that the latter can give large deviations from the standard model in the still unobserved dilepton modes, even after the bounds from $b\to s\gamma$ and precision electroweak observables are taken into account.