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Observation of single top quark production and measurement of |Vtb| with CDF

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dc.contributor University of Helsinki, Department of Physics en
dc.contributor University of Helsinki, Helsinki Institute of Physics en
dc.contributor University of Helsinki, Department of Physics en
dc.contributor University of Helsinki, Department of Physics en
dc.contributor University of Helsinki, Department of Physics en
dc.contributor.author Aaltonen, Timo
dc.contributor.author Mehtälä, Petteri
dc.contributor.author Orava, Risto
dc.contributor.author Saarikko, Heimo
dc.contributor.author Österberg, Kenneth
dc.contributor.author CDF Collaboration
dc.date.accessioned 2010-12-16T22:04:41Z
dc.date.available 2010-12-16T22:04:41Z
dc.date.issued 2010-12-15
dc.identifier.citation Aaltonen , T , Mehtälä , P , Orava , R , Saarikko , H , Österberg , K & CDF Collaboration 2010 , ' Observation of single top quark production and measurement of |Vtb| with CDF ' , Physical Review D : Particles, Fields, Gravitation and Cosmology , vol 82 , no. 11 , pp. 112005 . en
dc.identifier.issn 1550-7998
dc.identifier.other PURE: 7610797
dc.identifier.other ArXiv: http://arxiv.org/abs/1004.1181v2
dc.identifier.uri http://hdl.handle.net/10138/24162
dc.description.abstract We report the observation of electroweak single top quark production in 3.2  fb-1 of pp̅ collision data collected by the Collider Detector at Fermilab at √s=1.96  TeV. Candidate events in the W+jets topology with a leptonically decaying W boson are classified as signal-like by four parallel analyses based on likelihood functions, matrix elements, neural networks, and boosted decision trees. These results are combined using a super discriminant analysis based on genetically evolved neural networks in order to improve the sensitivity. This combined result is further combined with that of a search for a single top quark signal in an orthogonal sample of events with missing transverse energy plus jets and no charged lepton. We observe a signal consistent with the standard model prediction but inconsistent with the background-only model by 5.0 standard deviations, with a median expected sensitivity in excess of 5.9 standard deviations. We measure a production cross section of 2.3-0.5+0.6(stat+sys)  pb, extract the value of the Cabibbo-Kobayashi-Maskawa matrix element |Vtb|=0.91-0.11+0.11(stat+sys)±0.07  (theory), and set a lower limit |Vtb|>0.71 at the 95% C.L., assuming mt=175  GeV/c2. en
dc.format.extent 59
dc.language.iso eng
dc.publisher American Physical Society
dc.relation.ispartof Physical Review D : Particles, Fields, Gravitation and Cosmology
dc.relation.uri http://prd.aps.org/pdf/PRD/v82/i11/e112005
dc.subject 114 Physical sciences en
dc.subject hep-ex en
dc.title Observation of single top quark production and measurement of |Vtb| with CDF en
dc.title.alternative Observation of Single Top Quark Production and Measurement of |Vtb| with CDF en
dc.type A1 Refereed journal article
dc.identifier.doi http://dx.doi.org/10.1103/PhysRevD.82.112005
dc.type.dcmitype document
dc.type.uri info:eu-repo/semantics/article

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