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https://hdl.handle.net/2440/102638
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Type: | Journal article |
Title: | Search for the associated production of the Higgs boson with a top quark pair in multilepton final states 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: | Physics Letters B: Nuclear Physics and Particle Physics, 2015; 749:519-541 |
Publisher: | Elsevier |
Issue Date: | 2015 |
ISSN: | 0370-2693 1873-2445 |
Statement of Responsibility: | G. Aad ... P. Jackson ... L. Lee ... A. Petridis ... N. Soni ... M.J. White ... et al. (ATLAS Collaboration) |
Abstract: | A search for the associated production of the Higgs boson with a top quark pair is performed in multilepton final states using 20.3 fb−1 of proton–proton collision data recorded by the ATLAS experiment at √ s = 8 TeVat the Large Hadron Collider. Five final states, targeting the decays H → WW∗, ττ, and Z Z∗, are examined for the presence of the Standard Model (SM) Higgs boson: two same-charge light leptons (e or μ) without a hadronically decaying τ lepton; three light leptons; two same-charge light leptons with a hadronically decaying τ lepton; four light leptons; and one light lepton and two hadronically decaying τ leptons. No significant excess of events is observed above the background expectation. The best fit for the t¯tH production cross section, assuming a Higgs boson mass of 125 GeV, is 2.1+1.4 −1.2 times the SM expectation, and the observed (expected) upper limit at the 95% confidence level is 4.7 (2.4) times the SM rate. The p-value for compatibility with the background-only hypothesis is 1.8σ; the expectation in the presence of a Standard Model signal is 0.9σ. |
Rights: | © 2015 CERN for the benefit of the ATLAS Collaboration. Published by Elsevier B.V. This is an open access article under the CC BY license (http://creativecommons.org/licenses/by/4.0/). Funded by SCOAP3. |
DOI: | 10.1016/j.physletb.2015.07.079 |
Grant ID: | ARC |
Published version: | http://dx.doi.org/10.1016/j.physletb.2015.07.079 |
Appears in Collections: | Aurora harvest 3 Physics publications |
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hdl_102638.pdf | Published version | 1.52 MB | Adobe PDF | View/Open |
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