Looking for anomalous gamma-gamma-H and Z-gamma-H couplings at future linear collider

TL;DR

This paper explores how future linear colliders can detect anomalous gamma-gamma-H and Z-gamma-H couplings using the e-gamma--> e-H process, providing a model-independent analysis with potential for strong constraints.

Contribution

It introduces a model-independent effective operator framework to study anomalous couplings at future colliders, including polarization effects and backgrounds.

Findings

Process offers strong constraints on anomalous couplings.

Effective operators enable model-independent analysis.

Potential to distinguish CP-even and CP-odd contributions.

Abstract

We consider the possibility of studying anomalous contributions to the gamma-gamma-H and Z-gamma-H vertices through the process e-gamma--> e-H at future e-gamma linear colliders, with Sqrt(S)=500-1500 GeV. We make a model independent analysis based on SU(2)xU(1) invariant effective operators of dim=6 added to the standard model lagrangian. We consider a light Higgs boson (mostly decaying in bar(b)-b pairs), and include all the relevant backgrounds. Initial e-beam polarization effects are also analyzed. We find that the process e-gamma--> e-H provides an excellent opportunity to strongly constrain both the CP-even and the CP-odd anomalous contributions to the gamma-gamma-H and Z-gamma-H vertices.