CMS Collaboration, Adair, A., Akgun, B., et al.. "Observation of the Associated Production of a Single Top Quark and a W Boson in pp Collisions at √s=8 TeV." Physical Review Letters, 112, (2014) 231802. http://dx.doi.org/10.1103/PhysRevLett.112.231802.
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 fb−1 of proton-proton collisions at √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 tt 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.
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