Renormalization of the Higgs sector in the triplet model

TL;DR

This paper investigates one-loop radiative corrections to the Higgs mass spectrum and triple Higgs coupling in a triplet extension of the Standard Model, highlighting potential observable deviations in future collider experiments.

Contribution

It provides the first detailed calculation of one-loop corrections to Higgs masses and couplings in the triplet model, refining tree-level predictions and exploring their experimental implications.

Findings

One-loop corrections can significantly alter Higgs mass relations.

The triple Higgs coupling deviates notably from the Standard Model prediction.

Corrections are within reach of future collider precision measurements.

Abstract

We study radiative corrections to the mass spectrum and the triple Higgs boson coupling in the model with an additional Y=1 triplet field. In this model, the vacuum expectation value for the triplet field is strongly constrained from the electroweak precision data, under which characteristic mass spectrum appear at the tree level; i.e., $m_{H^{++}}^2-m_{H^+}^2\simeq m_{H^+}^2-m_A^2$ and $m_A^2\simeq m_H^2$, where the CP-even ($H$), the CP-odd ($A$) and the doubly-charged ($H^{\pm\pm}$) as well as the singly-charged ($H^\pm$) Higgs bosons are the triplet-like. We evaluate how the tree-level formulae are modified at the one-loop level. The $hhh$ coupling for the standard model-like Higgs boson ($h$) is also calculated at the one-loop level. One-loop corrections to these quantities can be large enough for identification of the model by future precision data at the LHC or the International Linear Collider.