Abstract
We present benchmark scenarios for searches for an additional Higgs state in the real Higgs singlet extension of the Standard Model in Run 2 of the LHC. The scenarios are selected such that they fulfill all relevant current theoretical and experimental constraints, but can potentially be discovered at the current LHC run. We take into account the results presented in earlier work and update the experimental constraints from relevant LHC Higgs searches and signal rate measurements. The benchmark scenarios are given separately for the low mass and high mass region, i.e. the mass range where the additional Higgs state is lighter or heavier than the discovered Higgs state at around 125 GeV. They have also been presented in the framework of the LHC Higgs Cross Section Working Group.
Highlights
The first run of the LHC at center-of-mass (CM) energies of 7 and 8 TeV has been completed in 2015
We present benchmark scenarios for searches for an additional Higgs state in the real Higgs singlet extension of the Standard Model in Run 2 of the LHC
In the low-mass region, where the heavier Higgs state takes the role of the discovered Higgs boson, m H ∼ 125 GeV, the parameter space is extremely constrained by the Higgs signal strength and exclusion limits from LEP Higgs searches [89]
Summary
The first run of the LHC at center-of-mass (CM) energies of 7 and 8 TeV has been completed in 2015. We find that the most severe constraints in the whole parameter space for the second Higgs mass m H 250 GeV are mostly given by limits from collider searches for a SM Higgs boson as well as by the LHC Higgs boson signal strength measurements. For the remaining viable parameter space we present predictions for signal cross sections of the yet undiscovered second Higgs boson for the LHC at a CM energy of 14 TeV, discussing both the SM Higgs decay signatures and the novel Higgs-to-Higgs decay mode H → hh. For both the highmass and the low-mass regions we present a variety of benchmark scenarios.
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