Fig. 5: Limits on the production of Higgs boson pairs and their time evolution.
From: A portrait of the Higgs boson by the CMS experiment ten years after the discovery
Left: the expected and observed limits on the ratio of experimentally estimated production cross-section and the expectation from the SM (σTheory) in searches using different final states and their combination. The search modes are ordered, from upper to lower, by their expected sensitivities from the least to the most sensitive. The overall combination of all searches is shown by the lowest entry. Right: expected and observed limits on HH production in different datasets: early LHC Run 2 data (35.9 fb−1), present results using full LHC Run 2 data (138 fb−1) and projections for the HL-LHC (3,000 fb−1).
