Precision Predictions for Higgs decays in the (N)MSSM

The signal that was discovered in the Higgs searches at ATLAS and CMS at a mass of ∼ 125 GeV [1–3] is, within the current theoretical and experimental uncertainties, compatible with the properties of the Higgs boson predicted within Standard-Model (SM) of particle physics. No conclusive signs of physics beyond the SM have been reported so far. However, the measurements of Higgs signal strengths for the various channels leave considerable room for Beyond Standard Model (BSM) interpretations. Consequently, the investigation of the precise properties of the discovered Higgs boson will be one of the prime goals at the LHC and beyond. While the mass of the observed particle is already known with excellent accuracy [4, 5], significant improvements of the information about the couplings of the observed state are expected from the upcoming runs of the LHC [3,6–9] and even more so from the high-precision measurements at a future e +e − collider [10–18]. For the accurate study of the properties of the Higgs boson, precise predictions for the various partial decay widths, the branching ratios (BRs) and the Higgs-boson production cross sections along with their theoretical uncertainties are indispensable.