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Performance of top-quark and W-boson tagging with ATLAS in Run 2 of the LHC
Stockholms universitet, Naturvetenskapliga fakulteten, Fysikum. Stockholms universitet, Naturvetenskapliga fakulteten, Oskar Klein-centrum för kosmopartikelfysik (OKC).
Stockholms universitet, Naturvetenskapliga fakulteten, Fysikum.
Stockholms universitet, Naturvetenskapliga fakulteten, Fysikum. Stockholms universitet, Naturvetenskapliga fakulteten, Oskar Klein-centrum för kosmopartikelfysik (OKC).
Stockholms universitet, Naturvetenskapliga fakulteten, Fysikum. Stockholms universitet, Naturvetenskapliga fakulteten, Oskar Klein-centrum för kosmopartikelfysik (OKC).
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Rekke forfattare: 29212019 (engelsk)Inngår i: European Physical Journal C, ISSN 1434-6044, E-ISSN 1434-6052, Vol. 79, nr 5, artikkel-id 375Artikkel i tidsskrift (Fagfellevurdert) Published
Abstract [en]

The performance of identification algorithms (taggers) for hadronically decaying top quarks and W bosons in pp collisions at = 13TeV recorded by the ATLAS experiment at the Large Hadron Collider is presented. A set of techniques based on jet shape observables are studied to determine a set of optimal cut-based taggers for use in physics analyses. The studies are extended to assess the utility of combinations of substructure observables as a multivariate tagger using boosted decision trees or deep neural networks in comparison with taggers based on two-variable combinations. In addition, for highly boosted top-quark tagging, a deep neural network based on jet constituent inputs as well as a re-optimisation of the shower deconstruction technique is presented. The performance of these taggers is studied in data collected during 2015 and 2016 corresponding to 36.1fb-1 for the tt and +jet and 36.7-1 for the dijet event topologies.

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2019. Vol. 79, nr 5, artikkel-id 375
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URN: urn:nbn:se:su:diva-171185DOI: 10.1140/epjc/s10052-019-6847-8ISI: 000466407600007OAI: oai:DiVA.org:su-171185DiVA, id: diva2:1350376
Tilgjengelig fra: 2019-09-11 Laget: 2019-09-11 Sist oppdatert: 2019-12-10bibliografisk kontrollert

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Bertoli, GabrieleBohm, ChristianCarney, Rebecca M. D.Clement, ChristopheGellerstedt, KarlHellman, StenJon-And, KerstinKastanas, AlexandrosMilstead, David A.Moa, TorbjörnMolander, SimonPasuwan, PatrawanShaikh, Nabila W.Silverstein, Samuel B.Sjölin, JörgenStrandberg, SaraUghetto, MichaëlValdés Santurio, EduardoWallängen, Veronica
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