Search for $W^{\prime }\to tb$ decays in the hadronic final state using pp collisions at $\sqrt{s}=13$ TeV with the ATLAS detector

Abstract

A search for $W^{\prime }$-boson production in the $W^{\prime }\to t\bar{b}\to q{\bar{q}}^{\prime }b\bar{b}$ decay channel is presented using 36.1 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 $W^{\prime }\to t\bar{b}$ 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.

37 pages in total, author list starting page 21, 5 figures, 2 tables, published in Phys. Lett. B., all figures including auxiliary figures are available at https://atlas.web.cern.ch/Atlas/GROUPS/PHYSICS/PAPERS/EXOT-2017-02/

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