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We present the program package 2HDECAY for the calculation of the partialdecay widths and branching ratios of the Higgs bosons of a generalCP-conserving 2-Higgs doublet model (2HDM). The tool includes the fullelectroweak one-loop corrections to all two-body on-shell Higgs decays in the2HDM that are not loop-induced. It combines them with the state-of-the-art QCDcorrections that are already implemented in the program HDECAY. For therenormalization of the electroweak sector an on-shell scheme is implemented formost of the renormalization parameters. Exceptions are thesoft-$\mathbb{Z}_2$-breaking squared mass scale $m_{12}^2$, where an$\overline{\text{MS}}$ condition is applied, as well as the 2HDM mixing angles$\alpha$ and $\beta$, for which several distinct renormalization schemes areimplemented. The tool 2HDECAY can be used for phenomenological analyses of thebranching ratios of Higgs decays in the 2HDM. Furthermore, the separate outputof the electroweak contributions to the tree-level partial decay widths forseveral different renormalization schemes allows for an efficient analysis ofthe impact of the electroweak corrections and the remaining theoretical errordue to missing higher-order corrections. The latest version of the programpackage 2HDECAY can be downloaded from the URLhttps://github.com/marcel-krause/2HDECAY .

computer physics communications

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