Search for $W^{\prime }\to t\bar{b}$ in the lepton plus jets final state in proton-proton collisions at a centre-of-mass energy of $\sqrt{s}$ = 8 TeV with the ATLAS detector

Abstract

A search for new charged massive gauge bosons, called $W^{\prime }$, is performed with the ATLAS detector at the LHC, in proton-proton collisions at a centre-of-mass energy of $\sqrt{s}$ = 8 TeV, using a dataset corresponding to an integrated luminosity of 20.3 fb${}^{-1}$. This analysis searches for $W^{\prime }$ bosons in the $W^{\prime }\to t\bar{b}$ 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 $W^{\prime }$ bosons. No significant deviation from the Standard Model expectation is observed and limits are set on the $W^{\prime }\to t\bar{b}$ cross-section times branching ratio and on the $W^{\prime }$-boson effective couplings as a function of the $W^{\prime }$-boson mass using the CL${}_s$ procedure. For a left-handed (right-handed) $W^{\prime }$ boson, masses below 1.70 (1.92) TeV are excluded at 95% confidence level.

arXiv comment12 pages plus author list + cover pages (27 pages total), 6 figures, 3 tables, submitted to Physics Letters B, All figures including auxiliary figures are available at https://atlas.web.cern.ch/Atlas/GROUPS/PHYSICS/PAPERS/TOPQ-2012-19/

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