Study of Top Effective Operators at the ILC

TL;DR

This paper explores how future linear colliders like the ILC can detect new physics effects in top quark pair production using effective operators, improving upon current LHC limits through optimized measurements.

Contribution

It introduces a comprehensive analysis of top quark effective operators at the ILC, demonstrating enhanced sensitivity and disentanglement of new physics effects compared to the LHC.

Findings

Effective operators can be constrained more tightly at the ILC.

Polarized beams and multiple energies improve operator disentanglement.

The approach offers better limits on anomalous top couplings.

Abstract

In this paper we study the effect of new physics contributions to the top quark pair production ($t\bar{t}$) in a possible future linear collider, such as the International Linear Collider (ILC). The use of a dimension-six gauge invariant effective operator approach allows to compare the prospected results at the ILC with the current ones obtained at the Large Hadron Collider (LHC), both in neutral and charged current processes. We also prove that the use of specific observables, together with a combination of measurements in different polarized beam scenarios and with different center-of-mass energies, allows to disentangle different effective operator contributions and significantly improve the limits on the anomalous couplings with respect to the LHC.