Leptonic anomalous gauge couplings detection on electron positron colliders

TL;DR

This paper investigates leptonic anomalous gauge couplings using effective Lagrangian, constrains them with existing data, and assesses the sensitivity of future electron-positron colliders to these couplings.

Contribution

It provides new bounds on anomalous gauge couplings and analyzes the potential of future colliders to test these couplings with different energies and polarizations.

Findings

Bounds of O(0.1-10) TeV^{-2} on anomalous couplings from Z factories.

500 GeV ILC can test couplings of O(0.1-1) TeV^{-2}.

1 TeV ILC can test couplings of O(0.01-0.1) TeV^{-2}.

Abstract

We studied the dimension-6 leptonic anomalous gauge couplings in the formulation of linearly realized gauge symmetry effective Lagrangian and investigated the constraints on these anomalous couplings from the existed experimental data including LEP2 and $W$/$Z$ boson decay. Some bounds of $O(0.1-10){\rm TeV}^{-2}$ on four relevant anomalous couplings are given by the Z factories. We studied the sensitivity of testing the leptonic anomalous couplings via the process $e^+e^-\rightarrow W^+W^-$ at future $e^+e^-$ linear colliders. We discussed different sensitivities to anomalous couplings at polarized and unpolarized $e^+e^-$ colliders, respectively, with 500 GeV and 1 TeV collision energy. Our results show that the a 500 GeV ILC can provide a test of the anomalous couplings, with the same relative uncertainty of cross section measurement, of $O(0.1-1){\rm TeV}^{-2}$, and a 1 TeV ILC can test the anomalous couplings of $O(0.01-0.1){\rm TeV}^{-2}$.