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Search for W’→tb→qqbb decays in collisions at (Formula presented.) = 8 TeV with the ATLAS detector
KTH, School of Engineering Sciences (SCI), Physics, Particle and Astroparticle Physics.
KTH, School of Engineering Sciences (SCI), Physics, Particle and Astroparticle Physics.
KTH, School of Engineering Sciences (SCI), Physics, Particle and Astroparticle Physics.ORCID iD: 0000-0003-3867-0336
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2015 (English)In: European Physical Journal C, ISSN 1434-6044, E-ISSN 1434-6052, Vol. 75, no 4Article in journal (Refereed) Published
Abstract [en]

A search for a massive W′ gauge boson decaying to a top quark and a bottom quark is performed with the ATLAS detector in pp collisions at the LHC. The datasetwas taken at a centre-of-mass energy of √s = 8 TeV and corresponds to 20.3 fb−1 of integrated luminosity. This analysis is done in the hadronic decay mode of the top quark, where novel jet substructure techniques are used to identify jets from high-momentum top quarks. This allows for a search for high-mass W′ bosons in the range 1.5-3.0 TeV. b-tagging is used to identify jets originating from b-quarks. The data are consistent with Standard Model background-only expectations, and upper limits at 95%confidence level are set on the W′ → tb cross section times branching ratio ranging from 0.16 pb to 0.33 pb for left-handed W′ bosons, and ranging from 0.10 pb to 0.21 pb for W′ bosons with purely righthanded couplings. Upper limits at 95% confidence level are set on the W′-boson coupling to tb as a function of the W′ mass using an effective field theory approach, which is independent of details of particular models predicting a W′ boson.

Place, publisher, year, edition, pages
Springer, 2015. Vol. 75, no 4
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Physical Sciences
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URN: urn:nbn:se:kth:diva-169092DOI: 10.1140/epjc/s10052-015-3372-2ISI: 000355671700005Scopus ID: 2-s2.0-84951869663OAI: oai:DiVA.org:kth-169092DiVA, id: diva2:819724
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QC 20150611

Available from: 2015-06-11 Created: 2015-06-11 Last updated: 2020-02-19Bibliographically approved

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Morley, AnthonyStrandberg, Jonas

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