Article
Search for the Standard Model Higgs boson produced in association with top quarks and decaying into bb¯ in pp collisions at s=8TeV with the ATLAS detector
European Physical Journal C, Springer Nature, ISSN 1434-6044
Volume 75, 7, 2015
DOI:10.1140/epjc/s10052-015-3543-1, Dimensions: pub.1024121856, PMC: PMC4528305, PMID: 26269691,
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Description
A search for the Standard Model Higgs boson produced in association with a top-quark pair, [Formula: see text], is presented. The analysis uses 20.3 fb-1 of pp collision data at [Formula: see text], collected with the ATLAS detector at the Large Hadron Collider during 2012. The search is designed for the [Formula: see text] 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 [Formula: see text]+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 [Formula: see text] 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 [Formula: see text] signal cross section to the Standard Model expectation is found to be [Formula: see text] assuming a Higgs boson mass of 125[Formula: see text].
Funders
- Ministry of Science and Technology of the People's Republic of China
- Chinese Academy of Sciences
- Japan Society for the Promotion of Science
- Slovenian Research Agency
- Science and Technology Facilities Council
- Ministry of Education, Science and Sport
- Israel Science Foundation
- German Research Foundation
- National Natural Science Foundation of China
- Ministry of Education Youth and Sports
- Leverhulme Trust
- Joint Institute for Nuclear Research
- Comisión Nacional de Investigación Científica y Tecnológica
- Agencia Nacional de Promoción Científica y Tecnológica
- French National Centre for Scientific Research
- European Research Council
- Atomic Energy and Alternative Energies Commission
- São Paulo Research Foundation
- Foundation for Science and Technology
- Alexander von Humboldt Foundation
- Swiss National Science Foundation
- Ministry of Economy, Industry and Competitiveness
- Federal Ministry of Education and Research
- Royal Society
- Brookhaven National Laboratory
- Rosatom (Russia)
- European Commission
- National Council for Scientific and Technological Development
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