Radiative corrections to the Higgs boson couplings in the Higgs triplet model

TL;DR

This paper computes one-loop level Higgs coupling constants in the Higgs triplet model to predict deviations from the Standard Model that future colliders could detect, aiding in understanding Higgs sector extensions.

Contribution

It provides the first detailed one-loop calculations of Higgs couplings in the Higgs triplet model, including decay rates and vertex corrections, for comparison with collider data.

Findings

Deviations in $hVV$ couplings can be about -1%.

Deviations in $hhh$ couplings can reach +50%.

Predicted deviations are within the sensitivity of future collider experiments.

Abstract

We calculate Higgs coupling constants at one-loop level in the Higgs triplet model (HTM) to compare to future collider experiments. We evaluate the decay rate of the standard model (SM)-like Higgs boson ($h$) into diphoton. Renormalized Higgs couplings with the weak gauge bosons $hVV$ ($V=W$\ and\ $Z$) and the trilinear coupling $hhh$ are also calculated at the one-loop level in the on-shell scheme. The event rate of the $pp\rightarrow h \rightarrow \gamma\gamma$ channel in the HTM to the one in the SM can cover the value from the recent LHC data. We find that in the allowed parameter region by the current data, deviations in the one-loop corrected $hVV$ and $hhh$ vertices can be about -1% and +50%, respectively. Magnitudes of these deviations can be enough significant to compare with the precision future data at the International Linear Collider.