Abstract
Precision predictions play an important role in the search for indirect New Physics effects in the Higgs sector itself. For the electroweak (EW) corrections of the Higgs bosons in extended Higgs sectors several renormalization schemes have been worked out that provide gauge-parameter-independent relations between the input parameters and the computed observables. Our recently published program codes 2HDECAY and ewN2HDECAY al- low for the computation of the EW corrections to the Higgs decay widths and branching ratios of the Two-Higgs-Doublet Model (2HDM) and the Next-to-Minimal-2HDM (N2HDM) for different renormalization schemes of the scalar mixing angles. In this paper, we present a comprehensive and complete overview over the relative size of the EW corrections to the branching ratios of the 2HDM and N2HDM neutral Higgs bosons for different applied renormalization schemes. We quantify the size of the EW corrections of Standard Model (SM)- and non-SM-like Higgs bosons and moreover also identify renormalization schemes that are well-behaved and do not induce unnaturally large corrections. We furthermore pin down decays and parameter regions that feature large EW corrections and need further treatment in order to improve the predictions. Our study sets the scene for future work in the computation of higher-order corrections to the decays of non-minimal Higgs sectors.
Highlights
While the discovery of the Higgs boson in 2012 by the LHC experiments ATLAS [1] and CMS [2] marked a milestone for particle physics, there are still many questions left open
With the exception of the MS scheme, the corrections to the Standard Model (SM)-like decays are of the typical size of EW corrections with values ranging between below 2.5% up to about 25% depending on the decay, the renormalization scheme and the type of the 2HDM
– We remark that the scheme sets S1 and S2, independently of the N2HDM type, typically feature corrections larger than 100 % for roughly 10 % to 13 % of the parameter points for all decay channels
Summary
While the discovery of the Higgs boson in 2012 by the LHC experiments ATLAS [1] and CMS [2] marked a milestone for particle physics, there are still many questions left open. We investigate the impact of electroweak corrections on the neutral Higgs boson decays of two non-SUSY extension of the Higgs sector These are the TwoHiggs-Doublet Model (2HDM) [3, 4] and the Next-to-Minimal Two-Higgs-Doublet-Model (N2HDM) [5, 6]. While the 2HDM is the simplest Higgs doublet extension of the SM, the more complex structure of the N2HDM Higgs sector allows for more freedom in the parameter space, inducing additional interesting effects in the phenomenology In both models, light Higgs bosons are still allowed in the spectrum and have an impact on Higgs observables but as we will show, on the size of the electroweak corrections.
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