Search for Higgs Boson Pair Production in the γγbb̅ Final State Using PP Collision Data at √s = 8 TeV from the ATLAS Detector


Searches are performed for resonant and nonresonant Higgs boson pair production in the γγbb̅ 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.



Standard Model, Large Hadron Collider (France and Switzerland), Higgs bosons, Proton-proton interactions


CC BY 3.0 (Attribution), © 2015 CERN, for the ATLAS Collaboration