Probing exotic Higgs sectors from the precise measurement of Higgs boson couplings

TL;DR

This paper investigates how precise measurements of Higgs boson couplings can reveal the presence of exotic Higgs sectors with higher isospin representations, potentially leading to deviations from Standard Model predictions.

Contribution

It provides a detailed analysis of coupling deviations in models with exotic Higgs representations, including triplet, Georgi-Machacek, and septet scalar models.

Findings

Couplings can be larger than Standard Model predictions in exotic sectors.

Deviations in Higgs decay rates are quantified for various channels.

Potential to distinguish exotic Higgs sectors through precise coupling measurements.

Abstract

We study coupling constants of the standard model like Higgs boson with the gauge bosons $hZZ$ and $hWW$ and fermions $hf\bar{f}$ in the general Higgs sector which contains higher isospin representations with arbitrary hypercharge. In Higgs sectors with exotic Higgs representations, the $hZZ$ and $hWW$ coupling constants can be larger than those in the standard model. We calculate deviations in the Higgs boson couplings from standard model values in the model with a real or complex triplet field, the Georgi-Machacek model and the model with a septet scalar field. We also study deviations in the event rates of $h\to ZZ^*$, $h\to WW^*$, $h\to \gamma\gamma$, $h\to b\bar{b}$ and $h\to \tau\tau$ channels.