Properties and searches of the exotic neutral Higgs bosons in the Georgi-Machacek model

TL;DR

This paper investigates the properties and search strategies for four neutral Higgs bosons predicted by the Georgi-Machacek model, focusing on the small mixing angle scenario and using recent ATLAS data to constrain model parameters.

Contribution

It provides a detailed analysis of the decay and production characteristics of the exotic Higgs bosons in the Georgi-Machacek model, incorporating current experimental constraints.

Findings

Constraints on the triplet vacuum expectation value as a function of Higgs masses

Decay and production properties of the neutral Higgs bosons in the small-alpha scenario

Compatibility of the model with latest ATLAS search data

Abstract

The Georgi-Machacek model predicts the existence of four neutral Higgs bosons, one of which can be identified as the 125-GeV Higgs boson. The latest Higgs data favor the parameter space of small mixing angle alpha between the two custodial singlets of the model. The other two neutral Higgs bosons belong respectively to the custodial triplet and quintet. We study the general decay and production properties of these particles in the small-alpha scenario. Constraints on the SU(2)_L triplet vacuum expectation value are obtained as a function of the exotic Higgs boson masses using latest ATLAS data of various search channels for additional neutral Higgs bosons.