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Search for the associated production of the Higgs boson with a top quark pair in multilepton final states with the ATLAS detector
KTH, School of Engineering Sciences (SCI), Physics, Particle and Astroparticle Physics.
KTH, School of Engineering Sciences (SCI), Physics.
KTH, School of Engineering Sciences (SCI), Physics, Particle and Astroparticle Physics.ORCID iD: 0000-0002-8913-0981
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Number of Authors: 2828
2015 (English)In: Physics Letters B, ISSN 0370-2693, E-ISSN 1873-2445, Vol. 749, 519-541 p.Article in journal (Refereed) PublishedText
Abstract [en]

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 root s = 8 TeVat the Large Hadron Collider. Five final states, targeting the decays H -> WW*, tau tau, and ZZ*, are examined for the presence of the Standard Model (SM) Higgs boson: two same-charge light leptons (e or mu) without a hadronically decaying tau lepton; three light leptons; two same-charge light leptons with a hadronically decaying tau lepton; four light leptons; and one light lepton and two hadronically decaying tau leptons. No significant excess of events is observed above the background expectation. The best fit for the t (t) over barH 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 1.8s; the expectation in the presence of a Standard Model signal is 0.9 sigma.

Place, publisher, year, edition, pages
Elsevier, 2015. Vol. 749, 519-541 p.
Keyword [en]
Standard Model, Parton Distributions, Massless Particles, Broken Symmetries, Gamma-Gamma, Nlo, Lhc, Collisions, Program, Physics
National Category
Subatomic Physics
Identifiers
URN: urn:nbn:se:kth:diva-179481DOI: 10.1016/j.physletb.2015.07.079ISI: 000361562900076ScopusID: 2-s2.0-84942813808OAI: oai:DiVA.org:kth-179481DiVA: diva2:883460
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QC 20151217

Available from: 2015-12-17 Created: 2015-12-17 Last updated: 2015-12-17Bibliographically approved

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