# Observation of the associated production of a single top quark and a W boson in pp collisions at sqrt(s) = 8 TeV

Abstract : The first observation of the associated production of a single top quark and a W boson is presented. The analysis is based on a data set corresponding to an integrated luminosity of 12.2 inverse femtobarns of proton-proton collisions at sqrt(s) = 8 TeV recorded by the CMS experiment at the LHC. Events with two leptons and a jet originating from a b quark are selected. A multivariate analysis based on kinematic and topological properties is used to separate the signal from the dominant t t-bar background. An excess consistent with the signal hypothesis is observed, with a significance which corresponds to 6.1 standard deviations above a background-only hypothesis. The measured production cross section is 23.4 +/- 5.4 pb, in agreement with the standard model prediction.
Document type :
Journal articles

http://hal.in2p3.fr/in2p3-00929819
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Submitted on : Tuesday, January 14, 2014 - 7:20:24 AM
Last modification on : Tuesday, October 12, 2021 - 10:32:02 AM

### Citation

S. Chatrchyan, S. Baffioni, F. Beaudette, P. Busson, C. Charlot, et al.. Observation of the associated production of a single top quark and a W boson in pp collisions at sqrt(s) = 8 TeV. Physical Review Letters, American Physical Society, 2014, 112, pp.231802. ⟨10.1103/PhysRevLett.112.231802⟩. ⟨in2p3-00929819⟩

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