Status of the Higgs singlet extension of the standard model after LHC run 1

By T. Robens, T. Stefaniak. 2015

338 citations recorded by the source corpus.

We discuss the current status of theoretical and experimental constraints on the real Higgs singlet extension of the standard model. For the second neutral (non-standard) Higgs boson we consider the full mass range from $$1~\mathrm{GeV}$$1GeV to $$1~\mathrm{TeV}$$1TeV accessible at past and current collider experiments. We separately discuss three scenarios, namely, the case where the second Higgs boson is lighter than, approximately equal to, or heavier than the discovered Higgs state at around $$125~\mathrm{GeV}$$125GeV. We investigate the impact of constraints from perturbative unitarity, electroweak precision data with a special focus on higher-order contributions to the $$W$$W boson mass, perturbativity of the couplings as well as vacuum stability. The latter two are tested up to a scale of $$\sim $$∼$$4 \times 10^{10}\,\mathrm{GeV}$$4×1010GeV using renormalization group equations. Direct collider constraints from Higgs signal rate measurements at the LHC and $$95\,\%$$95% confidence level exclusion limits from Higgs searches at LEP, Tevatron, and LHC are included via the public codes HiggsSignals and HiggsBounds, respectively. We identify the strongest constraints in the different regions of parameter space. We comment on the collider phenomenology of the remaining viable parameter space and the prospects for a future discovery or exclusion at the LHC.

Subfields: Astronomy and Astrophysics, Computer Networks and Communications, Nuclear and High Energy Physics

View Paper: https://www.semanticscholar.org/paper/0108618793adf9dcbe377af21ca0107dffa5c32b

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In Astronomy and Astrophysics

1. John Ellis
2. T. Konstandin
3. J. No
4. M. Drewes
5. Igor P. Ivanov
6. M. Raidal
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In Computer Networks and Communications

1. M. Raidal
2. Abdelhak Djouadi
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4. Igor P. Ivanov
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In Nuclear and High Energy Physics

1. Cms Collaboration
2. Atlas Collaboration
3. Gudrun Heinrich
4. Fabio Maltoni
5. Igor P. Ivanov
6. M. Drewes
7. Juan Rojo
8. John Ellis

Citations in the corpus

• Higgs Physics at the HL-LHC and HE-LHC (2019, background): “For non-doublet electroweak multiplets (as well as singlets [594]), one obtains an ‘aligned’ SM-like Higgs when the non-doublet [989, 990] Higgs VEV is small, which typically also suppresses the Higgs mixing angle [991, 992].”
• Building and testing models with extended Higgs sectors (2017, background): “The study [354] focusing on the real singlet extension gave a more detailed picture.”
• Dark Matter through the Higgs portal (2019, methodology): “[121, 122] for singlet Higgs models, [134, 594, 595] for two Higgs doublets models, Refs.”
• Detecting gravitational waves from cosmological phase transitions with LISA: an update (2019, background): “LHC measurements indicate that the observed 125 GeV Higgs field is quite SM-like, and currently the mixing angle is constrained to satisfy [74–76] |sin θ| .”
• A facility to search for hidden particles at the CERN SPS: the SHiP physics case (2015, background): “These limits can be translated into limits on the mixing angles between the doublet and singlet scalars [228].”