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

ATLAS, Collaboration; Beck, Hans Peter; Cervelli, Alberto; Ereditato, Antonio; Haug, Sigve; Kabana, Sonja; Meloni, Federico; Mullier, Geoffrey André Adrien; Pretzl, Klaus-Peter; Stramaglia, Maria Elena; Stucci, Stefania; Weber, Michael (2015). Search for the associated production of the Higgs boson with a top quark pair in multilepton final states with the ATLAS detector. Physics letters. B, 749, pp. 519-541. Elsevier 10.1016/j.physletb.2015.07.079

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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 +1.4 −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 .

Item Type:

Journal Article (Original Article)

Division/Institute:

10 Strategic Research Centers > Albert Einstein Center for Fundamental Physics (AEC)
08 Faculty of Science > Physics Institute > Laboratory for High Energy Physics (LHEP)

UniBE Contributor:

Beck, Hans Peter; Cervelli, Alberto; Ereditato, Antonio; Haug, Sigve; Meloni, Federico; Mullier, Geoffrey André Adrien; Pretzl, Klaus-Peter; Stramaglia, Maria Elena; Stucci, Stefania and Weber, Michael

Subjects:

500 Science > 530 Physics

ISSN:

0370-2693

Publisher:

Elsevier

Language:

English

Submitter:

Annette Krebs-Wegenast

Date Deposited:

08 Sep 2016 12:28

Last Modified:

12 Feb 2017 02:08

Publisher DOI:

10.1016/j.physletb.2015.07.079

ArXiv ID:

1506.05988

Additional Information:

Kollaboration - Es sind nur die Berner Autoren namentlich erwähnt

BORIS DOI:

10.7892/boris.87612

URI:

https://boris.unibe.ch/id/eprint/87612

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