Search For Higgs Boson Pair Production in the γγbb Final State using pp Collision Data at √s=8 TeV from the ATLAS Detector

ATLAS, Collaboration; Beck, Hans Peter; Cervelli, Alberto; Ereditato, Antonio; Haug, Sigve; Kabana, Sonja; Meloni, Federico; Mullier, Geoffrey André Adrien; Pretzl, Klaus-Peter; Stramaglia, Maria Elena; Stucci, Stefania; Weber, Michael (2015). Search For Higgs Boson Pair Production in the γγbb Final State using pp Collision Data at √s=8 TeV from the ATLAS Detector. Physical review letters, 114(8), 081802. American Physical Society 10.1103/PhysRevLett.114.081802

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Searches are performed for resonant and non-resonant Higgs boson pair production in the γγbb final state using 20 fb⁻¹ of proton-proton collisions at a center-of-mass energy of 8 TeV recorded with the ATLAS detector at the CERN Large Hadron Collider. A 95% confidence level upper limit on the cross section times branching ratio of non-resonant production is set at 2.2 pb, while the expected limit is 1.0 pb. The difference derives from a modest excess of events, corresponding to 2.4 standard deviations from the background-only hypothesis. The limit observed in the search for a narrow X→hh resonance ranges between 0.7 and 3.5 pb as a function of the resonance mass.

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