Measuring anomalous WW$\gamma$ and t$\bar{\text{t}}\gamma$ couplings using top+$\gamma$ production at the LHC

TL;DR

This paper investigates anomalous top quark-photon and WW-photon couplings at the LHC by analyzing single top plus photon production, proposing angular asymmetries and cross section ratios to detect deviations from the Standard Model.

Contribution

It introduces a novel method using angular asymmetries and cross section ratios to probe anomalous electroweak top and gauge boson couplings at the LHC.

Findings

Angular asymmetry effectively distinguishes anomalous couplings from the Standard Model.

Proposed observables show high sensitivity to new physics effects.

Method enhances detection prospects for deviations in top-photon and WW-photon interactions.

Abstract

We consider the electroweak production of a top quark in association with a photon at the LHC to probe the electroweak top quark couplings (t$\bar{\text{t}}\gamma$) as well as the triple gauge boson couplings (WW$\gamma$). The study is based on the modifications of the t$\bar{\text{t}}\gamma$ and WW$\gamma$ interactions via heavy degrees of freedom in the form of dimension-six operators which we add to the standard model Lagrangian. A binned angular asymmetry in single top quark plus photon events and cross section ratio are proposed to probe the anomalous t$\bar{\text{t}}\gamma$ and WW$\gamma$ couplings. It is shown that the proposed angular asymmetry can distinguish anomalous t$\bar{\text{t}}\gamma$, WW$\gamma$ couplings from the standard model prediction and yield a great sensitivity.