Search for the associated production of the Higgs boson with a top quark pair in multilepton final states with the ATLAS detector
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<sup>-1</sup> of proton–proton collision data recorded by the ATLAS experiment at √s = 8 TeV at the Large Hadron Collider. Five final states, targeting th...
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| Autores principales: | , , , , , , |
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| Formato: | Articulo |
| Lenguaje: | Inglés |
| Publicado: |
2015
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| Materias: | |
| Acceso en línea: | http://sedici.unlp.edu.ar/handle/10915/80413 |
| Aporte de: |
| Sumario: | 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<sup>-1</sup> 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 t¯tH production cross section, assuming a Higgs boson mass of 125 GeV, is 2.1<sup>+1.4</sup><sub>-1.2</sub> 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 . |
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