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dc.contributor.authorAad, G.en_US
dc.contributor.authorAbbott, B.en_US
dc.contributor.authorAbdallah, J.en_US
dc.contributor.authorAbdinov, O.en_US
dc.contributor.authorAben, R.en_US
dc.contributor.authorAbolins, M.en_US
dc.contributor.authorAbouZeid, O. S.en_US
dc.contributor.authorIzen, Joseph M. |Leyton, Michaelen_US
dc.contributor.authorMeirose, Bernharden_US
dc.contributor.authorNamasivayam, Harisankaren_US
dc.contributor.authorReeves, Kendallen_US
dc.contributor.authorATLAS Collaborationen_US
dc.date.accessioned2016-11-23T21:06:05Z
dc.date.available2016-11-23T21:06:05Z
dc.date.created2015-07-29en_US
dc.date.issued2015-07-29en_US
dc.identifier.issn1434-6044en_US
dc.identifier.urihttp://hdl.handle.net/10735.1/5141
dc.description.abstractA search for the Standard Model Higgs boson produced in association with a top-quark pair, tt̅H , is presented. The analysis uses 20.3 fb⁻¹ of pp collision data at √s̅ = TeV, collected with the ATLAS detector at the Large Hadron Collider during 2012. The search is designed for the H → bb̅ decay mode and uses events containing one or two electrons or muons. In order to improve the sensitivity of the search, events are categorised according to their jet and b-tagged jet multiplicities. A neural network is used to discriminate between signal and background events, the latter being dominated by tt̅ + jets production. In the single-lepton channel, variables calculated using a matrix element method are included as inputs to the neural network to improve discrimination of the irreducible tt̅ + bb̅ background. No significant excess of events above the background expectation is found and an observed (expected) limit of 3.4 (2.2) times the Standard Model cross section is obtained at 95 % confidence level. The ratio of the measured tt̅H signal cross section to the Standard Model expectation is found to be μ = 1.5 ± 11 assuming a Higgs boson mass of 125 Gev.en_US
dc.language.isoenen_US
dc.publisherSpringeren_US
dc.relation.urihttp://dx.doi.org/10.1140/epjc/s10052-015-3543-1
dc.rightsCC BY 4.0 (Attribution)en_US
dc.rights©2015 CERN, for the ATLAS Collaborationen_US
dc.rights.urihttp://creativecommons.org/licenses/by/4.0/en_US
dc.sourceEuropean Physical Journal C
dc.subjectPartonsen_US
dc.subjectParticles (Nuclear physics)en_US
dc.subjectProton-proton interactionsen_US
dc.subjectMass (Physics)en_US
dc.subjectBroken symmetry (Physics)en_US
dc.subjectMass (Physics)en_US
dc.subjectHadronsen_US
dc.subjectColliders (Nuclear physics)en_US
dc.subjectMonte Carlo methodsen_US
dc.subjectLarge Hadron Collider (France and Switzerland)en_US
dc.subjectLeptons (Nuclear physics)en_US
dc.titleSearch for the Standard Model Higgs Boson Produced in Association with Top Quarks and Decaying into bb̅ in pp Collisions at √s̅ = 8 TeV with the ATLAS Detectoren_US
dc.type.genreArticleen_US
dc.identifier.bibliographicCitationAad, G., B. Abbott, J. Abdallah, O. Abdinov, et al. 2015. "Search for the Standard Model Higgs boson produced in association with top quarks and decaying into bb̅ in pp collisions at √s̅ = 8 TeV with the ATLAS detector." European Physical Journal C 75(7), doi: 10.1140/epjc/s10052-015-3543-1en_US
dc.identifier.volume75en_US
dc.identifier.issue7en_US
dc.contributor.utdAuthorIzen, Joseph M.en_US
dc.contributor.utdAuthorLeyton, Michaelen_US
dc.contributor.utdAuthorMeirose, Bernharden_US
dc.contributor.utdAuthorNamasivayam, Harisankaren_US
dc.contributor.utdAuthorReeves, Kendallen_US
dc.contributor.VIAF250674117 (Izen, JM)en_US
dc.contributor.VIAF250674117 (Izen, JM)


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