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Type: Journal article
Title: Search for the standard model higgs boson produced in association with top quarks and decaying into bb in pp collisions at √s = 8 TeV with the ATLAS detector
Other Titles: Search for the standard model higgs boson produced in association with top quarks and decaying into bb in pp collisions at root s = 8 TeV with the ATLAS detector
Author: Aad, G.
Abbott, B.
Abdallah, J.
Abdinov, O.
Aben, R.
Abolins, M.
AbouZeid, O.
Abramowicz, H.
Abreu, H.
Abreu, R.
Abulaiti, Y.
Acharya, B.
Adamczyk, L.
Adams, D.
Adelman, J.
Adomeit, S.
Adye, T.
Affolder, A.
Agatonovic-Jovin, T.
Aguilar-Saavedra, J.
et al.
Citation: European Physical Journal C, 2015; 75(7):349-1-349-50
Publisher: Springer
Issue Date: 2015
ISSN: 1434-6044
Statement of
G. Aad ... P. Jackson ... L. Lee ... A. Petridis ... N. Soni ... M.J. White ... et al. (ATLAS Collaboration)
Abstract: A search for the Standard Model Higgs boson produced in association with a top-quark pair, t ¯tH, is presented. The analysis uses 20.3 fb−1 √ of pp collision data at s = 8 TeV, collected with theATLAS detector at the Large Hadron Collider during 2012. The search is designed for the H → b¯b 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 t ¯t+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 t ¯t+b¯b background. No significant excess of events above the background expectation is found and an observed (expected) limit of 3.4 (2.2) times the StandardModel cross section is obtained at 95% confidence level. The ratio of the measured t ¯tH signal cross section to the StandardModel expectation is found to be μ = 1.5±1.1 assuming a Higgs boson mass of 125 GeV .
Keywords: ATLAS Publications; ATLAS Publications; ATLAS Publications; ATLAS Publications
Rights: © CERN for the benefit of the ATLAS collaboration 2015. This article is published with open access at This article is distributed under the terms of the Creative Commons Attribution 4.0 International License (, which permits unrestricted use, distribution, and reproduction in any medium, provided you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made.
RMID: 0030032715
DOI: 10.1140/epjc/s10052-015-3543-1
Appears in Collections:Physics publications

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