Abstract
We perform a comprehensive study of collider aspects of a Higgs portal scenario that is protected by an unbroken Z2 symmetry. If the mass of the Higgs portal scalar is larger than half the Higgs mass, this scenario becomes very difficult to detect. We provide a detailed investigation of the model's parameter space based on analyses of the direct collider sensitivity at the LHC as well as at future lepton and hadron collider concepts and analyse the importance of these searches for this scenario in the context of expected precision Higgs and electroweak measurements. In particular we also consider the associated electroweak oblique corrections that we obtain in a first dedicated two-loop calculation for comparisons with the potential of, e.g., GigaZ. The currently available collider projections corroborate an FCC-hh 100 TeV as a very sensitive tool to search for such a weakly-coupled Higgs sector extension, driven by small statistical uncertainties over a large range of energy coverage. Crucially, however, this requires good theoretical control. Alternatively, Higgs signal-strength measurements at an optimal FCC-ee sensitivity level could yield comparable constraints.
Highlights
The lack of evidence for new physics beyond the Standard Model (SM) so far observed at the Large Hadron Collider (LHC) combined with the requirement of new interactions to reconcile shortcomings of the SM has motivated a range of new collider concepts that are currently discussed in the community
We find that the projected global constraints on universal Higgs mixing for 240 GeV lepton colliders are in good agreement with constraints that we obtain from a projection of e+e− → H Z alone
We can turn to a comparison of the expected sensitivity to this difficult to access new physics scenario
Summary
The lack of evidence for new physics beyond the Standard Model (SM) so far observed at the Large Hadron Collider (LHC) combined with the requirement of new interactions to reconcile shortcomings of the SM has motivated a range of new collider concepts that are currently discussed in the community. With LHC measurements progressing, active discussions are underway to push the energy frontier with a new hadron machine This could reach up to 100 TeV centre-of-mass energy in the case of a Future Circular Collider (FCC) as discussed in case studies [1,2,3]. The direct discovery potential of such a machine, given its large energy coverage, is apparent when compared to collider proposals working at smaller energy such as the Compact Linear Collider (CLIC) or FCC-ee proposals. The latter designs typically offer a much more controlled environment that can be exploited in finding beyond the SM physics through a systematic deviation in precision data when compared with the SM-expectation.
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