Probing $HZ\gamma$ and $H\gamma\gamma$ Anomalous Couplings in the Process of $e^+e^- \to H\gamma$

TL;DR

This paper investigates the potential of future electron-positron colliders to measure and constrain anomalous Higgs couplings to Z gamma and gamma gamma through the process e+e- to H gamma, including decay analysis.

Contribution

It introduces a detailed method to probe anomalous Higgs couplings in e+e- collisions and derives bounds assuming no new physics signals are observed.

Findings

Electron-positron colliders can effectively test HZγ and Hγγ couplings.

Conservative bounds on anomalous couplings are established.

The process H→bb enhances detection sensitivity.

Abstract

We propose to measure the $HZ\gamma$ and $H\gamma\gamma$ anomalous couplings in the process of $e^{+}e^{-}\rightarrow H\gamma$ with the sequential decay of $H\to b{\bar b}$. The discovery potential of observing the anomalous couplings are explored in details. Our study shows that the electron-positron collider has a great potential of testing the $HZ\gamma$ and $H\gamma\gamma$ couplings. Conservative bounds on the two anomalous couplings are also derived when no new physics signal were detected on top of the SM backgrounds.