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. and Abbott, B. and Abdallah, J. and Khalek, S. A. and Abdinov, O. and Krasznahorkay, Attila and Nagai, Yoshikazu and Pásztor, Gabriella and Tóth, József (2015) 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. pp. 235-255. ISSN 0370-2693

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Abstract

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′ → t¯b 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′ → t¯b cross-section times branching ratio and on the 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.

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