Study of top quark dipole interactions in $t\bar{t}$ production associated with two heavy gauge bosons at the LHC

TL;DR

This paper explores the potential to measure the top quark's dipole moments at the LHC through specific production processes, introducing new angular observables and analyzing their sensitivity to new physics beyond the Standard Model.

Contribution

It presents a novel analysis of top quark dipole moments using $tar{t}WW$ and $tar{t}ZZ$ production, including angular observables and invariant mass studies for the first time.

Findings

Sensitivity to top quark dipole moments at 95% CL is established.

Angular observables are effective probes for dipole moment variations.

Invariant mass distributions provide additional sensitivity to new physics.

Abstract

In this paper, we investigate the prospects of measuring the strong and weak dipole moments of the top quark at the Large Hadron Collider (LHC). Measurements of these couplings provide an excellent opportunity to probe new physics interactions as they have quite small magnitudes in the Standard Model. Our analyses are through studying the production cross sections of $t\bar{t}WW$ and $t\bar{t}ZZ$ processes in the same sign dilepton and four-lepton final states, respectively. The sensitivities to strong and weak top quark dipole interactions at the $95\%$ confidence level for various integrated luminosity scenarios are derived and compared with other studies. In addition to using the total cross sections, a novel handle based on an angular observable is introduced which is found to be sensitive to variations of the top quark strong dipole moments. We also investigate the sensitivity of the invariant mass of the system to the strong and weak dipole moments of the top quark.