N2HDECAY: Higgs Boson Decays in the Different Phases of the N2HDM

TL;DR

N2HDECAY is a computational tool that accurately predicts Higgs boson decay properties within the extended N2HDM framework, accounting for higher-order effects across different symmetry-breaking phases.

Contribution

It introduces a comprehensive program that calculates Higgs decay widths and branching ratios in the N2HDM, including QCD corrections and off-shell effects, for various phases.

Findings

Provides precise decay predictions for all N2HDM phases.

Incorporates dominant higher-order effects in decay calculations.

Enables detailed phenomenological studies of extended Higgs sectors.

Abstract

The program N2HDECAY calculates the branching ratios and decay widths of the Higgs bosons of the Next-to-Two-Higgs-Doublet Model (N2HDM). The code incorporates the dominant higher-order effects by including QCD corrections and off-shell decay modes. The N2HDM is an extension of the Standard Model by a Higgs doublet and a real Higgs singlet. Its phenomenology can change dramatically depending on which global symmetries are broken by electroweak symmetry breaking. It can feature a large visible Higgs sector in the broken phase, behave like a 2HDM with scalar singlet dark matter in the dark singlet phase, or, in the inert doublet phase, extend an inert doublet model by mixing a singlet with the SM Higgs boson. N2HDECAY provides precise predictions for the decays of the Higgs bosons in all of these phases.