Marcel Krause's research while affiliated with Karlsruhe Institute of Technology and other places

Publications (11)

Article
Full-text available
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 comput...
Article
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In this paper we compute the electroweak corrections to the charged Higgs boson decay into a W boson and a neutral Higgs boson in the CP-conserving NMSSM. We calculate the process in a general Rξ gauge and investigate the dependence of the loop-corrected decay width on the gauge parameter ξ. The gauge dependence arises from the mixing of different...
Article
We present in this paper our new program package ewN2HDECAY for the calculation of the partial decay widths and branching ratios of the Higgs bosons of the Next-to-Minimal 2-Higgs Doublet Model (N2HDM). The N2HDM is based on a general CP-conserving 2HDM which is extended by a real scalar singlet field. The program computes the complete electroweak...
Article
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 st...
Article
Full-text available
A bstract We present our calculation of the two-loop corrections of $$ \mathcal{O} $$ O ( $$ {\alpha}_t^2 $$ α t 2 ) to the neutral Higgs boson masses of the CP-violating Next-to-Minimal Supersymmetric extension of the Standard Model (NMSSM). The calculation is performed in the Feynman diagrammatic approach in the gaugeless limit at vanishing exter...
Preprint
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 st...
Preprint
Full-text available
Many complex vacuum systems include edge-welded bellows. Their simulation in the molecular flow regime with a Test Particle Monte Carlo (TPMC) code, such as MolFlow+, can take considerable amounts of computing power and time. Therefore we investigated the change of the transmission probability of a bellow compared to a cylindrical tube in TPMC simu...
Article
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The Next-to-Minimal 2-Higgs-Doublet Model (N2HDM) is an interesting benchmark model for a Higgs sector consisting of two complex doublet and one real singlet fields. Like the Next-to-Minimal Supersymmetric extension (NMSSM) it features light Higgs bosons that could have escaped discovery due to their singlet admixture. Thereby, the model allows for...
Article
The detailed investigation of the Higgs sector at present and future colliders necessitates from the theory side as precise predictions as possible, including higher-order corrections. An important ingredient for the computation of higher-order corrections is the renormalization of the model parameters and fields. In this paper we complete the reno...
Article
Full-text available
The detailed investigation of the Higgs sector at present and future colliders necessitates from the theory side as precise predictions as possible, including higher order corrections. An important ingredient for the computation of higher order corrections is the renormalization of the model parameters and fields. In this paper we complete the reno...
Article
Full-text available
The 2-Higgs-Doublet Model (2HDM) belongs to the simplest extensions of the Standard Model (SM) Higgs sector that are in accordance with theoretical and experimental constraints. In order to be able to properly investigate the experimental Higgs data and, in the long term to distinguish between possible models beyond the SM, precise predictions for...

Citations

... The general or type-III 2HDM has been shown to be able to explain the flavour changing charged current for ( ), whilst respecting constraints from the lepton flavour violating (LFV) decays → and → 3 [32]. The 2HDM may also provide an explanation for things such as LHC data [33][34][35][36][37], B-anomalies [38][39][40][41][42], and decays of Higgs bosons [43][44][45][46][47][48][49][50][51], to name a few. ...
... Depending on the numerical equality of symbolically different masses, the reduction of certain integral topologies yields different results, see Fig. 1 for an illustration. In the old formulas, this reduction was already executed assuming non-degenerate spectra, thus generating mass differences in denominators due to the use of partial-fraction expansion; in the vicinity of scenarios with degenerate masses, e. g. the A deviation from the prescription of inserting tree-level masses (within the chosen approximation) into loop corrections breaks invariance under gauge-fixing and field-renormalization schemes and therefore introduces new sources of uncertainty [21][22][23] two stops, these expressions caused artificial divergences that were cured by an explicit small offset for one of the involved input parameters. Now, utilizing the results of Ref. [28], the generalized integrals are reduced to scalar integrals without introducing possibly divergent denominators. ...
... The results for the loop corrected branching ratios (BRs) that we will show in this paper have been generated with the codes 2HDECAY [34] and N2HDECAY [35] that are based on extensions of the FORTRAN codes HDECAY [36,37] and N2HDECAY [6], respectively, to include also electroweak corrections. 4 Based on HDECAY, the decay widths and BRs already include the state-of-the-art higher-order QCD corrections, so that the presented numbers are the most precise predictions that can be provided at present. ...
... We also study the effects of the complex phases on the muon AMM in both models. All these contributions to the AMM and to the EDM of the charged leptons have been implemented in our two published Fortran codes NMSSMCALC [36][37][38][39][40] and NMSSMCALC-nuSS [31] which compute the Higgs boson masses and mixings, together with Higgs boson decay widths and branching ratios taking into account the most up-to-date higher-order corrections. The codes can be downloaded from the url: https://www.itp.kit.edu/~maggie/NMSSMCALC/ and https://www.itp.kit.edu/~maggie/NMSSMCALC-nuSS/ ...
... In the following, we present the renormalization of the N2HDM DSP in order to calculate the electroweak (EW) corrections to the scattering process of the scalar DM particle χ with a nucleon. We follow the prescription presented in [16] by adapting the renormalization of the unbroken phase of the N2HDM to our scenario. This is done by taking the limit v s = α 2 = α 3 = 0 and by additionally renormalizing the parameters λ 7 and λ 8 , which are the ones that enter our calculation. ...
... The general or type-III 2HDM has been shown to be able to explain the flavour changing charged current for ( ), whilst respecting constraints from the lepton flavour violating (LFV) decays → and → 3 [32]. The 2HDM may also provide an explanation for things such as LHC data [33][34][35][36][37], B-anomalies [38][39][40][41][42], and decays of Higgs bosons [43][44][45][46][47][48][49][50][51], to name a few. ...
... Renormalization schemes employing a gauge-independent treatment of the tadpole terms were described recently in Refs. [37][38][39]. ...
... The general or type-III 2HDM has been shown to be able to explain the flavour changing charged current for ( ), whilst respecting constraints from the lepton flavour violating (LFV) decays → and → 3 [32]. The 2HDM may also provide an explanation for things such as LHC data [33][34][35][36][37], B-anomalies [38][39][40][41][42], and decays of Higgs bosons [43][44][45][46][47][48][49][50][51], to name a few. ...