Search for Neutral Triple Gauge Couplings with $ZZ$ Production at Future Electron Positron Colliders

TL;DR

This paper explores the potential of future electron-positron colliders to detect neutral triple gauge couplings via $ZZ$ production, demonstrating significant improvements over current collider constraints.

Contribution

It provides a detailed analysis of $ZZ$ production channels, event selection strategies, and projected sensitivity improvements for nTGC detection at future colliders.

Findings

Future colliders will improve nTGC constraints by 10-100 times.

Beam polarization enhances the sensitivity to nTGC signals.

Multiple decay channels are effectively combined for stronger constraints.

Abstract

This study investigates Neutral Triple Gauge Couplings (nTGCs) through $ZZ$ production at future electron-positron colliders. The impact of beam polarization on cross section is analyzed. We compare the signals and backgrounds for five different $ZZ$ decay channels and present our event selection strategies for future $e^+e^-$ colliders. The expected coefficient constraints for each decay channels are provided, and final expected constraints are derived by combining results from the different decay patterns. Our analysis indicates that future electron-positron colliders will have significantly enhanced detection capabilities for nTGCs compared to the current LHC experiments, with expected improvements in constraints by one to two orders of magnitude.