N2HDECAY: Higgs boson decays in the different phases of the N2HDM

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. Program summaryProgram Title:N2HDECAYProgram Files doi:http://dx.doi.org/10.17632/n45d9zd5xz.1Licensing provisions: GPLv2Programming language: Fortran 77Nature of problem: Calculation of branching ratios and total widths for the Higgs bosons and the top-quark in the N2HDM. To achieve a high precision, the decay widths are calculated including all available QCD and off-shell corrections.Solution method: The code calculates all required Higgs couplings from a standard set of N2HDM input parameters. The computations of the decay widths use analytic formulas for all two particle final states. Off-shell decays are integrated numerically and a linear interpolation over the resonance is performed.