2HDECAY—A program for the calculation of electroweak one-loop corrections to Higgs decays in the Two-Higgs-Doublet Model including state-of-the-art QCD corrections

Abstract

We present the program package 2HDECAY for the calculation of the partial decay widths and branching ratios of the Higgs bosons of a general CP-conserving 2-Higgs doublet model (2HDM). The tool includes the full electroweak one-loop corrections to all two-body on-shell Higgs decays in the 2HDM that are not loop-induced. It combines them with the state-of-the-art QCD corrections that are already implemented in the program HDECAY. For the renormalization of the electroweak sector an on-shell scheme is implemented for most of the renormalization parameters. Exceptions are the soft-Z2-breaking squared mass scale m122, where an MS¯ condition is applied, as well as the 2HDM mixing angles α and β, for which several different renormalization schemes are implemented. The tool 2HDECAY can be used for phenomenological analyses of the branching ratios of Higgs decays in the 2HDM. Furthermore, the separate output of the electroweak contributions to the tree-level partial decay widths for several different renormalization schemes, computed consistently with an automatic parameter conversion between the different schemes, allows for an efficient analysis of the impact of the electroweak corrections and the remaining theoretical error due to missing higher-order corrections. The latest version of the program package 2HDECAY can be downloaded from the URL https://github.com/marcel-krause/2HDECAY. Program summaryProgram Title:2HDECAYProgram Files doi:http://dx.doi.org/10.17632/znthhmjg7r.1Licensing provisions: GPLv3Programming language:FORTRAN 77/90; Python 2/3Nature of problem: Numerical calculation of branching ratios and partial decay widths for the decays of all Higgs bosons in the Two-Higgs-Doublet Model at electroweak one-loop level for non-loop-induced on-shell decays in combination with contributions from the state-of-the-art QCD corrections and off-shell decays already implemented in HDECAY 6.52. Renormalization of the electroweak sector in 17 different renormalization schemes and automatic input parameter conversion for the comparison of numerical results calculated within these different schemes.Solution method: All tree-level and one-loop contributions to the genuine decay amplitudes and for the definition of the renormalization constants are calculated fully analytically and evaluated numerically. The electroweak corrections are consistently combined with the existing corrections implemented in HDECAY 6.52.Additional comments including restrictions and unusual features: For the electroweak corrections, only non-loop-induced on-shell decays are implemented.