Search for W ′  →  tb decays in the hadronic final state using pp collisions at √s = 13 TeV with the ATLAS detector

De Castro , S.; Fabbri , L.; Gabrielli , A.; Rinaldi , L.; Semprini Cesari , N.; Sioli , M.; Villa , M.; Zoccoli , A.; Bellagamba , L.; Boscherini , D.; Bruni , A.; Bruni , G.; D’Amen , G.; Giacobbe , B.; Polini , A.; Sbarra , C.; Sidoti , A.; Spighi , R.; Franchini , M.; Mengarelli , A.; Romano , M.; Valentinetti , S.; Alberghi , G. L.; Biondi , S.; Fabbri , F.; Lasagni Manghi , F; Massa , L.; Ucchielli , G.; Vittori , C.; ATLAS collaboration

doi:10.1016/j.physletb.2018.03.036

A search for W -boson production in the W → t¯b → qq¯b¯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 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 → t¯b production cross-section times branching ratio as a function of the W-boson mass. These limits exclude W bosons with right-handed couplings with masses below 3.0 TeV and W bosons with left-handed couplings with masses below 2.9 TeV, at the 95% confidence level.

De Castro, S., Fabbri, L., Gabrielli, A., Rinaldi, L., Semprini Cesari, N., Sioli, M., et al. (2018). Search for W ′  →  tb decays in the hadronic final state using pp collisions at √s = 13 TeV with the ATLAS detector. PHYSICS LETTERS. SECTION B, 781, 327-348 [10.1016/j.physletb.2018.03.036].