Search for → Decays in the Hadronic Final State Using Collisions at with the ATLAS detector

A search for ${W}^{\prime }$-boson production in the ${W}^{\prime }\to t\overline{b}\to q{\overline{q}}^{\prime }b\overline{b}$ decay channel is presented using $36.1\phantom{\rule{0.25em}{0ex}}\text{fb}{}^{-1}$ of 13 TeV proton–proton collision data collected by the ATLAS detector at the Large Hadron Collider in 2015 and 2016. The search is interpreted in terms of both a left-handed and a right-handed chiral ${W}^{\prime }$ boson within the mass range 1–5 TeV. Identification of the hadronically decaying top quark is performed using jet substructure tagging techniques based on a shower deconstruction algorithm. No significant deviation from the Standard Model prediction is observed and the results are expressed as upper limits on the ${W}^{\prime }\to t\overline{b}$ production cross-section times branching ratio as a function of the ${W}^{\prime }$-boson mass. These limits exclude ${W}^{\prime }$ bosons with right-handed couplings with masses below 3.0 TeV and ${W}^{\prime }$ bosons with left-handed couplings with masses below 2.9 TeV, at the 95% confidence level.