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Search for Higgs Boson Pair Production in the gamma gamma b(b)over-bar Final State Using pp Collision Data at root s=8 TeV from the ATLAS Detector
KTH, School of Engineering Sciences (SCI), Physics, Particle and Astroparticle Physics.ORCID iD: 0000-0001-5650-4556
KTH, School of Engineering Sciences (SCI), Physics, Particle and Astroparticle Physics.ORCID iD: 0000-0002-1921-6173
KTH, School of Engineering Sciences (SCI), Physics, Particle and Astroparticle Physics.ORCID iD: 0000-0003-3867-0336
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Number of Authors: 28822015 (English)In: Physical Review Letters, ISSN 0031-9007, E-ISSN 1079-7114, Vol. 114, no 8, article id 081802Article in journal (Refereed) Published
Abstract [en]

Searches are performed for resonant and nonresonant Higgs boson pair production in the gamma gamma b (b) over bar 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.

Place, publisher, year, edition, pages
2015. Vol. 114, no 8, article id 081802
National Category
Physical Sciences
Identifiers
URN: urn:nbn:se:kth:diva-166392DOI: 10.1103/PhysRevLett.114.081802ISI: 000350210600004PubMedID: 25768755Scopus ID: 2-s2.0-84924362886OAI: oai:DiVA.org:kth-166392DiVA, id: diva2:810738
Funder
Swedish Research Council
Note

QC 20150508

Available from: 2015-05-08 Created: 2015-05-08 Last updated: 2024-03-15Bibliographically approved

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Jovicevic, JelenaKuwertz, EmmaLund-Jensen, BengtMorley, AnthonyStrandberg, Jonas

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