Abstract
We present the concept of H-COUP_ver 2, which evaluates the decay rates (including higher order corrections) for the Higgs boson with a mass of 125GeV in various extended Higgs models. In the previous version (H-COUP_1.0), only a full set of the Higgs boson vertices are evaluated at one-loop level in a gauge invariant manner in these models. H-COUP_ver 2 contains all the functions of H-COUP_1.0. After shortly introducing these extended Higgs models and discussing their theoretical and experimental constraints, we summarize formulae for the renormalized vertices and the decay rates. We then explain how to install and run H-COUP_ver 2 with some numerical examples. Program summaryProgram title: H-COUP Version 2CPC Library link to program files: http://dx.doi.org/10.17632/f88szmrj5x.2Developer’s repository link: http://www-het.phys.sci.osaka-u.ac.jp/ hcoup/Licensing provisions: GPLv3Programming language: Fortran90Journal Reference of previous version: Comput. Phys. Commun. 233 (2018), 134–144Does the new version supersede the previous version?: YesReasons for the new version: The previous version (H-COUP_1.0), which numerically evaluates the full set of one-loop corrected vertex functions for the Higgs boson with a mass of 125 GeV, does not automatically provide the decay rates, the total decay width and branching ratios. In addition, QCD corrections have not been included in the previous version.Summary of revisions: Decay branching ratios and the total decay width for the Higgs boson with NLO electroweak and NNLO QCD corrections are added as outputs.Nature of problem: Decay rates for the Higgs boson and the total decay width are numerically evaluated at NLO for electroweak and NNLO for QCD in the Higgs singlet model, four types (Type-I, Type-II, Type-X, Type-Y) of two Higgs doublet models with a softly-broken Z2 symmetry and the inert doublet model.Solution of method: Electroweak and QCD corrections to the decay rates are computed by the improved on-shell scheme and the MS¯ scheme, respectively.Additional comments including restrictions and unusual features: All functions of the previous version are included in H-COUP_ver 2.
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