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Search for heavy particles decaying into top-quark pairs using lepton-plus-jets events in proton–proton collisions at √s=13 TeV with the ATLAS detector
Univ Mohammed, Fac Sci, Rabat, Morocco; Univ Arizona, Dept Phys, Tucson, AZ USA; Univ Adelaide, Dept Phys, Adelaide, SA, Australia.
Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, High Energy Physics.
Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, High Energy Physics.ORCID iD: 0000-0002-1253-8583
Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, High Energy Physics.
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Number of Authors: 28842018 (English)In: European Physical Journal C, ISSN 1434-6044, E-ISSN 1434-6052, Vol. 78, no 7, article id 565Article in journal (Refereed) Published
Abstract [en]

A search for new heavy particles that decay into top-quark pairs is performed using data collected from proton-proton collisions at a centre-of-mass energy of 13 TeV by the ATLAS detector at the Large Hadron Collider. The integrated luminosity of the data sample is 36.1 fb(-1). Events consistent with top-quark pair production are selected by requiring a single isolated charged lepton, missing transverse momentum and jet activity compatible with a hadronic top-quark decay. Jets identified as likely to contain b-hadrons are required to reduce the background from other Standard Model processes. The invariant mass spectrum of the candidate top-quark pairs is examined for local excesses above the background expectation. No significant deviations from the Standard Model predictions are found. Exclusion limits are set on the production cross-section times branching ratio for hypothetical Z' bosons, Kaluza-Kein gluons and Kaluza-Klein gravitons that decay into top-quark pairs.

Place, publisher, year, edition, pages
2018. Vol. 78, no 7, article id 565
National Category
Subatomic Physics
Identifiers
URN: urn:nbn:se:uu:diva-361533DOI: 10.1140/epjc/s10052-018-5995-6ISI: 000438114500005OAI: oai:DiVA.org:uu-361533DiVA, id: diva2:1252184
Funder
Swedish Research CouncilEU, European Research CouncilEU, FP7, Seventh Framework ProgrammeEU, Horizon 2020Danish National Research FoundationWallenberg FoundationsGerman Research Foundation (DFG)
Note

For complete list of authors see http://dx.doi.org/10.1140/epjc/s10052-018-5995-6

WoS title: Search for heavy particles decaying into top-quark pairs using lepton-plus-jets events in proton-proton collisions at root s=13 TeV with the ATLAS detector

Available from: 2018-10-01 Created: 2018-10-01 Last updated: 2018-10-01Bibliographically approved

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Asimakopoulou, Eleni M.Bergeås Kuutmann, ElinBrenner, RichardEkelöf, TordEllert, MattiasFerrari, ArnaudGradin, P. O. JoakimIsacson, Max F.Mårtensson, Mikael U.F.Sales De Bruin, Pedro
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