Search for Resonant and Nonresonant Higgs Boson Pair Production in the bb[over ]^{+}^{-} Decay Channel in pp Collisions at sqrt[s]=13TeV with the ATLAS Detector.

A search for resonant and nonresonant pair production of Higgs bosons in the bb[over ]^{+}^{-} final state is presented. The search uses 36.1fb^{-1} of pp collision data with sqrt[s]=13TeV recorded by the ATLAS experiment at the LHC in 2015 and 2016. Decays of the -lepton pairs with at least one lepton decaying to final states with hadrons and a neutrino are considered. No significant excess above the expected background is observed in the data. The cross-section times branching ratio for nonresonant Higgs boson pair production is constrained to be less than 30.9fb, 12.7 times the standard model expectation, at 95%confidence level. The data are also analyzed to probe resonant Higgs boson pair production, constraining a model with an extended Higgs sector based on two doublets and a Randall-Sundrum bulk graviton model. Upper limits are placed on the resonant Higgs boson pair production cross-section times branching ratio, excluding resonances X in the mass range 305GeV

Aaboud, M., Aad, G., Abbott, B., Abdinov, O., Abeloos, B., Abhayasinghe, D. K., ... ATLAS Collaboration.

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