Study of Higgs-gauge boson anomalous couplings through $e^-e^+ \rightarrow W^-W^+H$ at ILC

TL;DR

This paper investigates Higgs-gauge boson anomalous couplings at the ILC using the process e⁻e⁺ → W⁻W⁺H, analyzing sensitivity to various CP-conserving and CP-violating parameters through angular distributions.

Contribution

It provides the first detailed sensitivity analysis of Higgs-gauge boson anomalous couplings at the ILC with polarized beams using the effective Lagrangian approach.

Findings

ILC with 300 fb⁻¹ can constrain couplings effectively.

Couplings c̄_W and c̄_B are most influential.

Angular distributions help disentangle coupling effects.

Abstract

In this work, Higgs couplings with gauge bosons is probed through $e^-e^+ \rightarrow W^-W^+H$ in an effective Lagrangian framework. An ILC of 500 $GeV$ center of mass energy with possible beam polarization is considered for this purpose. The reach of ILC with integrated luminosity of 300 $fb^{-1}$ in the determination of both the CP-conserving and CP-violating parameters are obtained. Sensitivity of the probe of each of these couplings on the presence of other couplings is investigated. The most influential couplings parameters are $\bar c_W=-\bar c_B$. Other parameters of significant effect are $\bar c_{HW}$ and $\bar c_{HB}$ among the CP-conserving ones, and $\tilde c_{HW}$ and $\tilde c_{HB}$ among the CP-violating ones. CP-violating parameter, $\tilde c_\gamma$ seems to have very little influence on the process considered. Detailed study of the angular distributions have presented a way to disentangle the effect of some of these couplings.