Search for W′ → tb → qqbb Decays in pp Collisions at √s = 8 TeV with the ATLAS Detector
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s10052-015-3372-2_pdfa.pdf
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Author(s)
Taylor, Frank E.
Date Issued
April 2015
Journal
The European Physical Journal C
Publisher
Springer/Societa Italiana di Fisica
Citation
Aad, G., B. Abbott, J. Abdallah, S. Abdel Khalek, O. Abdinov, R. Aben, B. Abi, et al. “Search for W′ → tb → qqbb Decays in pp Collisions at √s = 8 TeV with the ATLAS Detector.” The European Physical Journal C 75, no. 4 (April 2015). © 2015 CERN for the benefit of the ATLAS collaboration
Version
Final published version
Abstract
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[superscript -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 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.
MIT Department
Massachusetts Institute of Technology. Department of Physics
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DOI of Published Version
https://doi.org/10.1140/epjc/s10052-015-3372-2
