A global approach to top-quark flavor-changing interactions

TL;DR

This paper presents a comprehensive, gauge-invariant effective-field-theory framework for analyzing top-quark flavor-changing interactions, incorporating higher-order QCD corrections and enabling a global interpretation of experimental data.

Contribution

It introduces a systematic, gauge-invariant EFT approach for top-quark FCNC interactions, including NLO QCD corrections and a first global analysis of experimental limits.

Findings

Successful implementation of NLO QCD corrections in the EFT framework

First global analysis of top-quark FCNC constraints using this approach

Encouragement for experimental collaborations to adopt and extend this methodology

Abstract

We adopt a fully gauge-invariant effective-field-theory approach for parametrizing top-quark flavor-changing-neutral-current interactions. It allows for a global interpretation of experimental constraints (or measurements) and the systematic treatment of higher-order quantum corrections. We discuss some recent results obtained at next-to-leading-order accuracy in QCD and perform, at that order, a first global analysis of a subset of the available experimental limits in terms of effective operator coefficients. We encourage experimental collaborations to adopt this approach and extend the analysis by using all information they have prime access to.