Search for W′→tb¯ in the lepton plus jets final state in proton–proton collisions at a centre-of-mass energy of √s=8 TeV with the ATLAS detector Aad, G. Aguilar Saavedra, Juan Antonio Atlas Collaboration Top-quark Pair production PP collisions Model Phenomenology Symmetry A search for new charged massive gauge bosons, called W′, is performed with the ATLAS detector at the LHC, in proton–proton collisions at a centre-of-mass energy of √s=8 TeV, using a dataset corresponding to an integrated luminosity of 20.3 fb−1. This analysis searches for W′ bosons in the W′→tb¯ decay channel in final states with electrons or muons, using a multivariate method based on boosted decision trees. The search covers masses between 0.5 and 3.0 TeV, for right-handed or left-handed W′ bosons. No significant deviation from the Standard Model expectation is observed and limits are set on the W′→tb¯ cross-section times branching ratio and on the W′W′-boson effective couplings as a function of the W′-boson mass using the CLs procedure. For a left-handed (right-handed) W′ boson, masses below 1.70 (1.92) TeV are excluded at 95% confidence level. 2015-06-17T08:22:35Z 2015-06-17T08:22:35Z 2015 info:eu-repo/semantics/article Atlas Collaboration. Search for W′→tb¯ in the lepton plus jets final state in proton–proton collisions at a centre-of-mass energy of √s=8 TeV with the ATLAS detector. Physics Letters B, 743: 235-255 (2015). [http://hdl.handle.net/10481/36650] 0370-2693 1873-2445 http://hdl.handle.net/10481/36650 10.1016/j.physletb.2015.02.051 eng http://creativecommons.org/licenses/by-nc-nd/3.0/ info:eu-repo/semantics/openAccess Creative Commons Attribution-NonCommercial-NoDerivs 3.0 License Elsevier