Combination of searches for Higgs boson pairs in pp collisions at √s = 13 TeV with the ATLAS detector
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Colleges, School and Institutes
This letter presents a combination of searches for Higgs boson pair production using up to 36.1 fb −1 of proton–proton collision data at a centre-of-mass energy s=13 TeV recorded with the ATLAS detector at the LHC. The combination is performed using six analyses searching for Higgs boson pairs decaying into the bb¯bb¯, bb¯W +W −, bb¯τ +τ −, W +W −W +W −, bb¯γγ and W +W −γγ final states. Results are presented for non-resonant and resonant Higgs boson pair production modes. No statistically significant excess in data above the Standard Model predictions is found. The combined observed (expected) limit at 95% confidence level on the non-resonant Higgs boson pair production cross-section is 6.9 (10) times the predicted Standard Model cross-section. Limits are also set on the ratio (κ λ) of the Higgs boson self-coupling to its Standard Model value. This ratio is constrained at 95% confidence level in observation (expectation) to −5.0<κ λ<12.0 (−5.8<κ λ<12.0). In addition, limits are set on the production of narrow scalar resonances and spin-2 Kaluza–Klein Randall–Sundrum gravitons. Exclusion regions are also provided in the parameter space of the habemus Minimal Supersymmetric Standard Model and the Electroweak Singlet Model.
|Number of pages||23|
|Journal||Physics Letters B|
|Early online date||19 Nov 2019|
|Publication status||Published - 10 Jan 2020|