Measuring Anomalous Couplings in H->WW* Decays at the International Linear Collider

TL;DR

This paper investigates the potential of the International Linear Collider to detect deviations in the Higgs to W-boson coupling, employing effective field theory and detailed simulations to estimate sensitivity to new physics.

Contribution

It introduces a comprehensive simulation framework for measuring anomalous Higgs-W couplings at the ILC using an effective Lagrangian approach and realistic detector modeling.

Findings

Projected constraints on anomalous couplings are provided.

Differential decay rates including dimension-5 operators are calculated.

Full detector simulation demonstrates the measurement feasibility.

Abstract

Measurement of the Higgs coupling to W-bosons is an important test of our understanding of the electroweak symmetry breaking mechanism. We study the sensitivity of the International Linear Collider (ILC) to the presence of anomalous HW+W- couplings using ZH -> nu nu WW* -> nu nu 4j events. Using an effective Lagrangian approach, we calculate the differential decay rates of the Higgs boson including the effects of new dimension-5 operators. We present a Monte Carlo simulation of events at the ILC, using a full detector simulation based on geant4 and a real event reconstruction chain. Expected constraints on the anomalous couplings are given.