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Observation of the Associated Production of a Single Top Quark and a W Boson in pp Collisions at s=8TeV

S. Chatrchyan et al. (CMS Collaboration)
Phys. Rev. Lett. 112, 231802 – Published 9 June 2014
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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 12.2fb1 of proton-proton collisions at s=8TeV 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±5.4pb, in agreement with the standard model prediction.

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  • Received 13 January 2014

DOI:https://doi.org/10.1103/PhysRevLett.112.231802

This article is available under the terms of the Creative Commons Attribution 3.0 License. Further distribution of this work must maintain attribution to the author(s) and the published article’s title, journal citation, and DOI.

© 2014 CERN, for the CMS Collaboration

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Top Quarks Go Solo in Rare Events

Published 9 June 2014

Separate collider experiments observe the top quark without its usual antiparticle partner in unique processes that could give insight into new physics, such as additional sets of quarks.

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See Also

Observation of s-Channel Production of Single Top Quarks at the Tevatron

T. Aaltonen et al. (CDF Collaboration†, D0 Collaboration‡)
Phys. Rev. Lett. 112, 231803 (2014)

Evidence for s-Channel Single-Top-Quark Production in Events with One Charged Lepton and Two Jets at CDF

T. Aaltonen et al. (CDF Collaboration)
Phys. Rev. Lett. 112, 231804 (2014)

Search for s-Channel Single-Top-Quark Production in Events with Missing Energy Plus Jets in pp¯ Collisions at s=1.96TeV

T. Aaltonen et al. (CDF Collaboration)
Phys. Rev. Lett. 112, 231805 (2014)

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Vol. 112, Iss. 23 — 13 June 2014

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