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

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• 作者：Tania Robens (1)
  Tim Stefaniak (2)
  
  1. Institut f眉r Kern- und Teilchenphysik ; TU Dresden ; Zellescher Weg 19 ; 01069 ; Dresden ; Germany
  2. Department of Physics ; Santa Cruz Institute for Particle Physics ; University of California ; Santa Cruz ; CA ; 95064 ; USA
  
• 刊名：The European Physical Journal C - Particles and Fields
• 出版年：2015
• 出版时间：March 2015
• 年：2015
• 卷：75
• 期：3
• 全文大小：7,093 KB
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• 刊物类别：Physics and Astronomy
• 刊物主题：Physics
  Elementary Particles and Quantum Field Theory
  Nuclear Physics, Heavy Ions and Hadrons
  Physics beyond the Standard Model
  Measurement Science and Instrumentation
  Astronomy, Astrophysics and Cosmology
  
• 出版者：Springer Berlin / Heidelberg
• ISSN：1434-6052

文摘

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 \(1~\mathrm{GeV}\) to \(1~\mathrm{TeV}\) 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 \(125~\mathrm{GeV}\) . We investigate the impact of constraints from perturbative unitarity, electroweak precision data with a special focus on higher-order contributions to the \(W\) boson mass, perturbativity of the couplings as well as vacuum stability. The latter two are tested up to a scale of \(\sim \) \(4 \times 10^{10}\,\mathrm{GeV}\) using renormalization group equations. Direct collider constraints from Higgs signal rate measurements at the LHC and \(95\,\%\) 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.