Search for W′→tb decays in the lepton + jets final state in pp collisions at √s = 8TeV

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Abstract

Results are presented from a search for the production of a heavy gauge boson W′ decaying into a top and a bottom quark, using a data set collected by the CMS experiment at √s = 8TeV and corresponding to an integrated luminosity of 19.5 fb−1. Various models of W′-boson production are studied by allowing for an arbitrary combination of left-and right-handed couplings. The analysis is based on the detection of events with a lepton (e, μ), jets, and missing transverse energy in the final state. No evidence for W′-boson production is found and 95% confidence level upper limits on the production cross section times branching fraction are obtained. For W′ bosons with purely right-handed couplings, and for those with left-handed couplings assuming no interference effects, the observed 95% confidence level limit is M(W′) > 2.05TeV. For W′ bosons with purely left handed couplings, including interference effects, the observed 95% confidence level limit is M(W′) > 1.84TeV. The results presented in this paper are the most stringent limits published to date.

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Chatrchyan, S., Khachatryan, V., Sirunyan, A. M., Tumasyan, A., Adam, W., Bergauer, T., … Woods, N. (2014). Search for W′→tb decays in the lepton + jets final state in pp collisions at √s = 8TeV. Journal of High Energy Physics, 2014(5). https://doi.org/10.1007/JHEP05(2014)108

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