Combination of searches for Higgs boson pairs in ppcollisions at √s=13 TeV with the ATLAS detector. Aad, G. Aguilar Saavedra, Juan Antonio Atlas Collaboration This letter presents a combination of searches for Higgs boson pair production using up to 36.1fb−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 b¯bb¯ b, b¯bW+W−, b¯ bτ+τ−, W+W−W+W−, b¯ bγγ 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 (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. 2020-01-24T07:36:54Z 2020-01-24T07:36:54Z 2019-11-19 info:eu-repo/semantics/article Aad, G., Abbott, B., Abbott, D. C., Abud, A. A., Abeling, K., Abhayasinghe, D. K., ... & Abreu, H. (2020). Combination of searches for Higgs boson pairs in pp collisions at s= 13TeV with the ATLAS detector. Physics Letters B, 800, 135103. http://hdl.handle.net/10481/59084 10.1016/j.physletb.2019.135103 eng http://creativecommons.org/licenses/by/3.0/es/ info:eu-repo/semantics/openAccess Atribución 3.0 España Elsevier BV