Search for the Standard Model Higgs boson produced in association with top quarks and decaying into in collisions at with the ATLAS detector
Web of Science
AuthorAad, G; Abbott, B; Abdallah, J; Abdinov, O; Aben, R; Abolins, M; AbouZeid, OS; Abramowicz, H; Abreu, H; Abreu, R; ...
Source TitleEuropean Physical Journal C: Particles and Fields
University of Melbourne Author/sMilesi, Marco; Taylor, Geoffrey; Dawe, Edmund; Barberio, Luigia; Nuti, Francesco; TAN, KONG GUAN; ZANZI, DANIELE; Jennens, David; Kubota, Takashi; Brennan, Amelia; ...
AffiliationSchool of Physics
Document TypeJournal Article
CitationsAad, G., Abbott, B., Abdallah, J., Abdinov, O., Aben, R., Abolins, M., AbouZeid, O. S., Abramowicz, H., Abreu, H., Abreu, R., Abulaiti, Y., Acharya, B. S., Adamczyk, L., Adams, D. L., Adelman, J., Adomeit, S., Adye, T., Affolder, A. A., Agatonovic-Jovin, T. ,... Zwalinski, L. (2015). Search for the Standard Model Higgs boson produced in association with top quarks and decaying into in collisions at with the ATLAS detector. EUROPEAN PHYSICAL JOURNAL C, 75 (7), https://doi.org/10.1140/epjc/s10052-015-3543-1.
Access StatusOpen Access
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].
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