Search for $W^{\prime }\to tb\to qqbb$ Decays in pp Collisions at $\sqrt{s}$ = 8 TeV with the ATLAS Detector

Abstract

A search for a massive $W^{\prime }$ 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 $\sqrt{s}=8$ 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 $W^{\prime }$ 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 $W^{\prime }\to tb$ cross section times branching ratio ranging from $0.16$ pb to $0.33$ pb for left-handed $W^{\prime }$ bosons, and ranging from $0.10$ pb to $0.21$ pb for $W^{\prime }$ bosons with purely right-handed couplings. Upper limits at 95% confidence level are set on the $W^{\prime }$-boson coupling to $tb$ as a function of the $W^{\prime }$ mass using an effective field theory approach, which is independent of details of particular models predicting a $W^{\prime }$ boson.

arXiv comment11 pages plus author list + cover page (24 pages total), 8 figures, 3 tables, submitted to European Physical Journal C, All figures including auxiliary figures are available at http://atlas.web.cern.ch/Atlas/GROUPS/PHYSICS/PAPERS/EXOT-2013-14

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