Abstract
We explore the room for possible deviations from the Standard Model (SM) Higgs boson coupling structure in a systematic study of Higgs coupling scale factor benchmark scenarios using the latest signal rate measurements from the Tevatron and LHC experiments. We employ chi-squared fits performed with HiggsSignals, which takes into account detailed information on signal efficiencies and major correlations of theoretical and experimental uncertainties. All considered scenarios allow for additional non-standard Higgs boson decay modes, and various assumptions for constraining the total decay width are discussed. No significant deviations from the SM Higgs boson coupling structure are found in any of the investigated benchmark scenarios. We derive upper limits on an additional (undetectable) Higgs decay mode under the assumption that the Higgs couplings to weak gauge bosons do not exceed the SM prediction. We furthermore discuss the capabilities of future facilities for probing deviations from the SM Higgs couplings, comparing the high luminosity upgrade of the LHC with a future International Linear Collider (ILC), where for the latter various energy and luminosity scenarios are considered. At the ILC model-independent measurements of the coupling structure can be performed, and we provide estimates of the precision that can be achieved.
Highlights
The Tevatron experiments [7] support the findings
We explore the room for possible deviations from the Standard Model (SM) Higgs boson coupling structure in a systematic study of Higgs coupling scale factor (κ) benchmark scenarios using the latest signal rate measurements from the Tevatron and LHC experiments
We show the estimated accuracies of the Higgs coupling scale factors at the International Linear Collider (ILC) obtained under model-dependent assumptions, in analogy to the analyses performed above for the projections of future accuracies at the LHC: in figure 18(a) we assume that any additional Higgs decay results in invisible final states; we take into account the projected ILC upper limit on BR(H → inv.), cf. table 16
Summary
The Tevatron experiments [7] support the findings. Within the current experimental and theoretical uncertainties the properties of the newly discovered particle are far in very good agreement with the predictions for a SM Higgs boson, including the measurements of signal rates as well as further properties such as spin. In order to test the compatibility of the newly observed boson with the predictions for the Higgs boson of the SM based on the data accumulated up to 2012, the LHC Higgs Cross section Working Group (LHCHXSWG) proposed several benchmark scenarios within an “interim framework” employing Higgs coupling scale factors [8, 9] This approach is based on earlier studies of the LHC sensitivity to Higgs couplings initiated in refs. Suggestions to achieve more sensitive constraints on the total width other than the ones limited by the experimental mass resolution have been made These are based on the analysis of off-shell contributions from above the Higgs resonance in Higgs decays to ZZ∗ or W W ∗ final states [29,30,31,32] and of interference effects between the H → γγ signal and the background continuum [33]. Based on those assumptions an upper limit on the branching ratio of the undetectable decay mode can be derived for each parametrization
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