Search for W’→tb→qqbb decays in collisions at (Formula presented.) = 8 TeV with the ATLAS detector
2015 (English)In: European Physical Journal C, ISSN 1434-6044, E-ISSN 1434-6052, Vol. 75, no 4Article in journal (Refereed) Published
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
2015. Vol. 75, no 4
IdentifiersURN: urn:nbn:se:kth:diva-169092DOI: 10.1140/epjc/s10052-015-3372-2ScopusID: 2-s2.0-84951869663OAI: oai:DiVA.org:kth-169092DiVA: diva2:819724
QC 201506112015-06-112015-06-112015-06-11Bibliographically approved