2014/01/31 by S. Chatrchyan, CMS Collaboration, V. Khachatryan +98 · 6 citations
Physics and Astronomy · #Astrophysics #Bottom quark #Higgs boson #High-Energy Particle Collisions Research #Jet (fluid) #Large Hadron Collider #Lepton #Luminosity #Nuclear physics #Particle physics #Particle physics theoretical and experimental studies #Physics #Physics beyond the Standard Model #Production (economics) #Proton #Quantum Chromodynamics and Particle Interactions #Quark #Standard Model (mathematical formulation) #Top quark #hep-ex
paper · pdf · doi:10.1103/physrevlett.112.231802
published as Phys. Rev. Lett. 112 (2014) 231802 · Replaced with published version. Added journal reference and DOI
openalex publication_date 2014/06/09 · arxiv created 2014/06/10 · arxiv updated 2014/06/11 · openalex created_date 2016/06/24 · openalex updated_date 2026/08/06
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 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 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.