Aad, G.Abbott, B.Abdallah, J.Abdinov, O.Aben, R.Abolins, M.AbouZeid, O. S.Izen, Joseph M.Leyton, MichaelMeirose, BernhardNamasivayam, HarisankarReeves, KendallATLAS Collaboration2016-07-062016-07-062015-09-092015-09-091434-6044http://hdl.handle.net/10735.1/4865A search for Higgs boson pair production pp → hh is performed with 19.5 fb⁻¹ of proton-proton collision data at √s̅ = 8 TeV, which were recorded by the ATLAS detector at the Large Hadron Collider in 2012. The decay products of each Higgs boson are reconstructed as a high-momentum bb̅ system with either a pair of small-radius jets or a single large-radius jet, the latter exploiting jet substructure techniques and associated b-tagged track-jets. No evidence for resonant or non-resonant Higgs boson pair production is observed. The data are interpreted in the context of the Randall-Sundrum model with a warped extra dimension as well as the two-Higgs-doublet model. An upper limit on the cross-section for pp → G_{KK}^*→ hh → bb̅bb̅ of 3.2 (2.3) fb is set for a Kaluza-Klein graviton G_{KK}^* mass of 1.0 (1.5) TeV, at the 95% confidence level. The search for non-resonant Standard Model hh production sets an observed 95% confidence level upper limit on the production cross-section σ(pp → hh → bb̅bb̅) of 202 fb, compared to a Standard Model prediction of σ(pp → hh → bb̅bb̅) = 3.6 ± 0.5 fb.enCC BY 4.0 (Attribution) License©2015 CERN, for the ATLAS Collaborationhttp://creativecommons.org/licenses/by/4.0/PartonsHadron collidersStandard ModelHiggs bosonsProton-proton interactionsArticleAad, G., B. Abbott, J. Abdallah, O. Abdinov, et al. 2015. "Search for Higgs boson pair production in the bb̅bb̅ final state from pp collisions at √s̅ = 8 TeV with the ATLAS detector." European Physical Journal C 75(9), doi:10.1140/epjc/s10052-015-3628-x.759