Search for the associated production of the Higgs boson with a top quark pair in multilepton final states with the ATLAS detector

Atlas Collaboration

研究成果: Contribution to journalArticle

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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 TeV at the Large Hadron Collider. Five final states, targeting the decays H→WW, ττ, and ZZ, 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 tt¯H production cross section, assuming a Higgs boson mass of 125 GeV, is 2.1−1.2 +1.4 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.

元の言語英語
ページ(範囲)519-541
ページ数23
ジャーナルPhysics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics
749
DOI
出版物ステータス出版済み - 10 7 2015

All Science Journal Classification (ASJC) codes

  • Nuclear and High Energy Physics

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