UNSPECIFIED (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: 081802. ISSN 1079-7114
PhysRevLett.114.081802.pdf - Published Version
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Abstract
Searches are performed for resonant and nonresonant 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 nonresonant 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.