Electroweak phase transition in non-minimal Higgs sectors
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Springer
Received: January 5, Revised: March 24, Accepted: April 15, Published: May 5,
2020 2020 2020 2020
Philipp Basler, Margarete M¨ uhlleitner and Jonas M¨ uller Institute for Theoretical Physics, Karlsruhe Institute of Technology, 76128 Karlsruhe, Germany
E-mail: [email protected], [email protected], [email protected] Abstract: 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. Keywords: Beyond Standard Model, CP violation, Higgs Physics ArXiv ePrint: 1912.10477
c The Authors. Open Access, Article funded by SCOAP3 .
https://doi.org/10.1007/JHEP05(2020)016
JHEP05(2020)016
Electroweak phase transition in non-minimal Higgs sectors
Contents 1 Introduction
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2 The 2.1 2.2 2.3
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effective potential The tree-level C2HDM potential The tree-level N2HDM potential One-loop effective potential at finite temperature
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4 Numerical analysis 4.1 Minimisation of the effective potential 4.2 Constraints and parameter scan
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5 Results 5.1 C2HDM — update 5.2 N2HDM — phenomenology of the SFOEWPT 5.2.1 Mass spectrum of the N2HDM T1 5.2.2 N2HDM T1 — trilinear Higgs self-couplings 5.2.3 N2HDM T1 — benchmark points 5.2.4 Mass spectrum of the N2HDM T2 5.2.5 N2HDM T2 — trilinear Higgs self-couplings 5.3 Comparison of the C2HDM and the N2HDM di-Higgs rates 5.3.1 C2HDM and N2HDM T1 5.3.2 C2HDM and N2HDM T2
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6 Conclusions
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1
Introduction
The discovery of the Higgs boson by the LHC experiments ATLAS [1] and CMS [2] has been a great success for particle physics. While the Higgs boson behaves very Standard Model (SM)-like [3–6] it is clear that there must be physics beyond the SM (BSM) in order to solve the remaining puzzles that cannot be explained within the SM. Thus the observed baryon asymmetry of the Universe [7] calls for new physics extensions. Electroweak baryogenesis [8–16] provides a mechanism for its generation if all three Sakharov conditions [17] are fulfilled. These are baryon number violation, C and CP violation and departure from the thermal equilibrium. The asymmetry can be generated if the electroweak phase transition (EWPT) is of strong first order [14, 16]. The strong first order
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3 Renormalisation
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