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 −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...

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Publicado: 2015
Acceso en línea:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_03702693_v749_n_p519_Aad
http://hdl.handle.net/20.500.12110/paper_03702693_v749_n_p519_Aad
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Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) de Universidad de Buenos Aires
id paper:paper_03702693_v749_n_p519_Aad
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spelling paper:paper_03702693_v749_n_p519_Aad2023-06-08T15:37:20Z 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 −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. © 2015 CERN for the benefit of the ATLAS Collaboration. 2015 https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_03702693_v749_n_p519_Aad http://hdl.handle.net/20.500.12110/paper_03702693_v749_n_p519_Aad
institution Universidad de Buenos Aires
institution_str I-28
repository_str R-134
collection Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA)
description 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. © 2015 CERN for the benefit of the ATLAS Collaboration.
title Search for the associated production of the Higgs boson with a top quark pair in multilepton final states with the ATLAS detector
spellingShingle Search for the associated production of the Higgs boson with a top quark pair in multilepton final states with the ATLAS detector
title_short Search for the associated production of the Higgs boson with a top quark pair in multilepton final states with the ATLAS detector
title_full Search for the associated production of the Higgs boson with a top quark pair in multilepton final states with the ATLAS detector
title_fullStr Search for the associated production of the Higgs boson with a top quark pair in multilepton final states with the ATLAS detector
title_full_unstemmed Search for the associated production of the Higgs boson with a top quark pair in multilepton final states with the ATLAS detector
title_sort search for the associated production of the higgs boson with a top quark pair in multilepton final states with the atlas detector
publishDate 2015
url https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_03702693_v749_n_p519_Aad
http://hdl.handle.net/20.500.12110/paper_03702693_v749_n_p519_Aad
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