Search for the associated production of the Higgs boson with a top quark pair in multilepton final states with the ATLAS detector Aad, G; Abbott, B; Abdallah, J; ...

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Aad, G ; Abbott, B ; Abdallah, J ; Abdinov, O ; Aben, R ; Abolins, M ; AbouZeid, O ; Abramowicz, H ; Abreu, H ; Abreu, R ; ...
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. G. Aad ... P. Jackson ... L. Lee ... A. Petridis ... N. Soni ... M.J. White ... et al. (ATLAS Collaboration)
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