Contact Interactions in Higgs-Vector Boson Associated Production at the ILC

TL;DR

This paper investigates how new physics effects, modeled by effective field theory operators, can influence Higgs-Vector boson production at the ILC, providing insights into potential beyond Standard Model phenomena.

Contribution

It introduces a specific class of dimension 6 operators generated by heavy vector exchanges and analyzes their impact on Higgs production processes at the ILC.

Findings

ILC can effectively probe these new contact interactions.

High-energy behavior of EFT operators is consistent with bounds from electroweak precision tests.

Correlation between hZ and hhZ signals can aid future NP searches.

Abstract

We explore new physics (NP) effects in Higgs-Vector boson associated production at a future International Linear Collider (ILC) via e+e- -> Zh,Zhh, using effective field theory (EFT) techniques. In particular, we focus on a certain class of dimension 6 operators, which are generated by tree-level exchanges of a new heavy vector field in the underlying theory. These operators induce new contact terms of the form \psi\psi\phi D\phi, involving the Standard Model (SM) fermions (\psi), gauge-bosons (D is the covariant derivative) and the SM Higgs field (\phi). We investigate the high-energy behaviour of these new effective interactions in e+e- -> Zh,Zhh, imposing bounds from electroweak precision measurements, and show that the ILC is an excellent testing ground for probing this type of NP via e+e- -> Zh,Zhh. We also address the validity of the EFT expansion and we study the correlation between the hZ and hhZ signals, which can be utilized in future searches for NP in these channels.