Bounds on anomalous gamma-gamma-H and Z-gamma-H couplings at future e-gamma linear colliders

TL;DR

This paper investigates the potential to set bounds on anomalous gamma-gamma-H and Z-gamma-H couplings at future e-gamma linear colliders, using a model-independent approach with dimension-6 operators.

Contribution

It provides the first detailed analysis of how e-gamma collisions can constrain anomalous Higgs couplings in a model-independent framework.

Findings

Strong bounds on CP-even anomalous couplings.

Effective constraints on CP-odd contributions.

Process is highly sensitive for future collider experiments.

Abstract

We study the bounds on the anomalous contributions to the gamma-gamma-H and Z-gamma-H vertices that can be obtained via the process e-gamma-->e H. We consider the representative case of an intermediate Higgs mass production of MH=120 GeV and for a center of mass energy of Sqrt{S}=500 GeV and Sqrt{S}=1500 GeV. We use a model independent analysis based on SU(2)xU(1) invariant operators of dimension 6 added to the Standard Model lagrangian. We find that this process provides an excelent way to put strong constraints both in the sector of CP-even and CP-odd anomalous couplings contribution to the gamma-gamma-H and Z-gamma-H vertices.