# Effects of universal extra dimensions on top-quark electromagnetic interactions

## TL;DR

This paper investigates how universal extra dimensions could influence top-quark electromagnetic interactions, specifically the anomalous magnetic moment and decay branching ratios, finding effects significantly below Standard Model predictions within current experimental bounds.

## Contribution

It provides a detailed analysis of Kaluza-Klein contributions to top-quark electromagnetic properties in a 5D Standard Model framework, highlighting their negligible impact under current bounds.

## Key findings

- Contributions are at least 3 orders of magnitude below Standard Model predictions.
- Current bounds on compactification scale limit observable effects.
- Universal extra dimensions have minimal impact on top-quark electromagnetic interactions.

## Abstract

Universal extra dimensions, presumably observable at some high-energy scale, would modify low-energy observables, being particularly relevant for physical processes forbidden at tree level by the Standard Model. We address the Kaluza-Klein contributions from the 5-dimensional Standard Model to the anomalous magnetic moment and to branching ratios of electromagnetic decays of the top quark. In accordance with present bounds on the compactification scale, contributions to both quantities are found to be at least 3 orders of magnitude below Standard-Model predictions.