Search for W′→tb→qqbb decays in pp collisions at √ s = 8 TeV with the ATLAS detector

Allison, Lee and Barton, Adam and Beattie, Michael and Borissov, Guennadi and Bouhova-Thacker, Eva and Chilingarov, Alexandre and Dearnaley, William and Fox, Harald and Grimm, Kathryn and Henderson, Robert and Hughes, Gareth and Jones, Roger William Lewis and Kartvelishvili, Vakhtang and Long, Robin and Love, Peter and Maddocks, Harvey and Smizanska, Maria and Walder, James (2015) Search for W′→tb→qqbb decays in pp collisions at √ s = 8 TeV with the ATLAS detector. European Physical Journal C: Particles and Fields, 75 (4). ISSN 1434-6044

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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 dataset was 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 0.16pb to 0.33pb for left-handed W ′ bosons, and ranging from 0.10pb to 0.21pb for W ′ bosons with purely right-handed 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.

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Journal Article
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European Physical Journal C: Particles and Fields
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EPJC is an open-access journal funded by SCOAP3 and licensed under CC BY 4.0 © CERN for the benefit of the ATLAS collaboration 2015. This article is published with open access at
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09 Sep 2015 06:34
Last Modified:
05 Jul 2020 04:35