The recent Higgs boson data and Higgs triplet model with vectorlike quarks

TL;DR

This paper explores a Higgs triplet model augmented with vectorlike quarks to better fit recent Higgs data, showing modifications in production and decay rates consistent with experimental observations.

Contribution

It introduces a Higgs triplet model with vectorlike quarks that can suppress certain production cross sections and enhance specific decay channels, aligning theory with recent collider data.

Findings

Enhanced Higgs to gamma gamma decay rate

Suppressed gluon fusion production cross section

Altered Higgs decay branching ratios

Abstract

Some vectorlike quarks are added to the Higgs triplet model with the motivation of fitting the recent Higgs boson data released by LHC and Tevatron collaborations. These vectorlike quarks can suppress the cross section of $gg\to h$ sizably, while the charged scalars, especially for the doubly charged scalar, can enhance $Br(h\to \gamma\gamma)$ more sizably. Besides, the Higgs couplings to $WW$, $ZZ$ and light fermions can be the same as their SM values. Thus, the model will enhance the Higgs production rates into $\gamma\gamma$ and $jj\gamma\gamma$, while those for $WW^*$, $ZZ^*$ and $\tau\bar{\tau}$ at the LHC are reduced relative to their SM predictions. The Higgs production rates into $Vb\bar{b}$ at the Tevatron are the same as the SM values.