N2HDECAY: Higgs boson decays in the different phases of the N2HDM

Engeln, Isabell; Mühlleitner, Margarete; Wittbrodt, Jonas

doi:10.1016/j.cpc.2018.07.020

Cited by 43 publications

(39 citation statements)

References 59 publications

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“…In our parameter scan we find that both decay channels are generally open in scenarios with a FOEWPT, except when h 3 is very singlet-like (and can thus effectively decouple from the FOEWPT dynamics, m h 3 v). In Figure 8 we show as result of our parameter scan defined in Table 4 the predictions for the signal rates pp (gg) → A → Zh 2 and pp (gg) → A → Zh 3 at the LHC with √ s = 13 TeV, where the production cross section has been calculated with SusHi v.1.6.1 [101,102], and the branching ratios have been obtained with N2HDECAY [27,74]. Since the production cross section σ(gg → A) is constant in our scan (it only depends on m A and tan β), Figure 8 effectively shows the interplay between BR(A → Zh 3 ) and BR(A → Zh 2 ).…”

Section: Case 1: Singlet Admixture In Hmentioning

confidence: 99%

Fate of electroweak symmetry in the early Universe: non-restoration and trapped vacua in the N2HDM

Biekötter

Heinemeyer

et al. 2021

J. Cosmol. Astropart. Phys.

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Extensions of the Higgs sector of the Standard Model allow for a rich cosmological history around the electroweak scale. We show that besides the possibility of strong firstorder phase transitions, which have been thoroughly studied in the literature, also other important phenomena can occur, like the non-restoration of the electroweak symmetry or the existence of vacua in which the Universe becomes trapped, preventing a transition to the electroweak minimum. Focusing on the next-to-minimal two-Higgs-doublet model (N2HDM) of type II and taking into account the existing theoretical and experimental constraints, we identify the scenarios of electroweak symmetry non-restoration, vacuum trapping and first-order phase transition in the thermal history of the Universe. We analyze these phenomena and in particular their relation to each other, and discuss their connection to the predicted phenomenology of the N2HDM at the LHC. Our analysis demonstrates that the presence of a global electroweak minimum of the scalar potential at zero temperature does not guarantee that the corresponding N2HDM parameter space will be physically viable: the existence of a critical temperature at which the electroweak phase becomes the deepest minimum is not sufficient for a transition to take place, necessitating an analysis of the tunnelling probability to the electroweak minimum for a reliable prediction of the thermal history of the Universe.

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Section: Case 1: Singlet Admixture In Hmentioning

confidence: 99%

Fate of electroweak symmetry in the early Universe: non-restoration and trapped vacua in the N2HDM

Biekötter

Heinemeyer

et al. 2021

J. Cosmol. Astropart. Phys.

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“…To check for consistency with the Higgs exclusion limits from LEP, Tevatron and LHC HiggsBounds5.5.0 [120][121][122] is used, and the SM-like Higgs rates are required to be within the 2σ range of the SM which is checked by HiggsSignals2.3.0 [123]. The required decay widths and branching ratios are obtained from C2HDM HDECAY [65] for the C2HDM and from N2HDECAY [64,124] for the N2HDM. Both codes are based on the implementation of the C2HDM and the N2HDM each in the existing code HDECAY [125,126].…”

Section: Jhep05(2020)016mentioning

confidence: 99%

Electroweak phase transition in non-minimal Higgs sectors

Basler

Mühlleitner

Müller

2020

J. High Energ. Phys.

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Higgs sector extensions beyond the Standard Model (BSM) provide additional sources of CP violation and further scalar states that help to trigger a strong first order electroweak phase transition (SFOEWPT) required to generate the observed baryon asymmetry of the Universe through electroweak baryogenesis. We investigate the CP-violating 2-Higgs-Doublet Model (C2HDM) and the Next-to-Minimal 2-Higgs-Doublet Model (N2HDM) with respect to their potential to generate an SFOEWPT while being compatible with all relevant and recent theoretical and experimental constraints. The implications of an SFOEWPT on the collider phenomenology of the two models are analysed in detail in particular with respect to Higgs pair production. We provide benchmark points for parameter points that are compatible with an SFOEWPT and provide distinct di-Higgs signatures.

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“…All phases of the N2HDM have been implemented in the ScannerS code [43,44] to perform parameter scans and in the N2HDECAY code [17,45] to calculate all Higgs branching ratios and decay widths including state-of-the-art higher-order QCD corrections and off-shell decays. Electroweak corrections, which -in contrast to the QCD corrections -cannot be taken over from the SM, have been consistently neglected.…”

Section: Parameter Scans and Constraintsmentioning

confidence: 99%

The dark phases of the N2HDM

Engeln

Ferreira

Mühlleitner

et al. 2020

J. High Energ. Phys.

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We discuss the dark phases of the Next-to-2-Higgs Doublet model. The model is an extension of the Standard Model with an extra doublet and an extra singlet that has four distinct CP-conserving phases, three of which provide dark matter candidates. We discuss in detail the vacuum structure of the different phases and the issue of stability at tree-level of each phase. Taking into account the most relevant experimental and theoretical constraints, we found that there are combinations of measurements at the Large Hadron Collider that could single out a specific phase. The measurement of h 125 → γγ together with the discovery of a new scalar with specific rates to τ + τ − or γγ could exclude some phases and point to a specific phase.

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N2HDECAY: Higgs boson decays in the different phases of the N2HDM

Cited by 43 publications

References 59 publications

Fate of electroweak symmetry in the early Universe: non-restoration and trapped vacua in the N2HDM

Fate of electroweak symmetry in the early Universe: non-restoration and trapped vacua in the N2HDM

Electroweak phase transition in non-minimal Higgs sectors

The dark phases of the N2HDM

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