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

Aad, G. and Abbott, B. and Abdallah, J. and Khalek, S. A. and Abdinov, O. and Krasznahorkay, Attila and Nagai, Yoshikazu and Pásztor, Gabriella and Tóth, József (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). ISSN 0031-9007

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Abstract

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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