# Radiative corrections of heavy scalar decays to gauge bosons in the singlet extension of the Standard Model

## TL;DR

This paper calculates radiative corrections to heavy scalar decays into gauge bosons within a singlet extension of the Standard Model, revealing potential corrections up to 7% influenced by scalar mass and mixing angle.

## Contribution

It provides the first detailed computation of radiative corrections to heavy scalar decays in the singlet extension, highlighting their dependence on model parameters.

## Key findings

- Corrections can reach up to 7% for W+W- decays.
- Corrections can reach up to 5% for ZZ decays.
- Dependence on heavy mass and mixing angle is significant.

## Abstract

Assuming the existence of a new real scalar singlet $s^0$ coupled to the Standard Model via a scalar quartic portal interaction, we compute the radiative corrections to the decay rates of the heavy scalar mass eigenstate to a couple of gauge bosons $ZZ$ and $W^+W^-(\gamma)$, showing that they can give a contribution as large as ${\cal{O}}$(5\%) and ${\cal{O}}$(7\%), respectively. We also explicitly analyze in detail their dependence on the heavy mass $m_S$ and on the scalar mixing angle $\alpha$, finding that, especially in the large-mass region, these depend on the sign of $\sin\alpha$.