Combination of searches for Higgs boson pairs in pp collisions at √s=13 TeV with the ATLAS detector



Collaboration, ATLAS
(2020) Combination of searches for Higgs boson pairs in pp collisions at √s=13 TeV with the ATLAS detector. Physics Letters B: Nuclear Physics and Particle Physics, 800.

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Abstract

This letter presents a combination of searches for Higgs boson pair production using up to 36.1fb−1of 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 b ̄bb ̄b, b ̄bW+W−, b ̄bτ+τ−, W+W−W+W−, b ̄bγγand W+W−γγfinal 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 (κλ) 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 <κλ<12.0(−5.8 <κλ<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.

Item Type: Article
Additional Information: 36 pages in total, author list starting page 20, 7 figures, 2 tables, submitted to Phys. Lett. B. All figures including auxiliary figures are available at http://atlas.web.cern.ch/Atlas/GROUPS/PHYSICS/PAPERS/HDBS-2018-58
Uncontrolled Keywords: hep-ex
Depositing User: Symplectic Admin
Date Deposited: 16 Dec 2019 09:30
Last Modified: 10 May 2021 10:26
DOI: 10.1016/j.physletb.2019.135103
Open Access URL: https://www.sciencedirect.com/science/article/pii/...
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URI: https://livrepository.liverpool.ac.uk/id/eprint/3066605