{
  "id": "1004.1181",
  "version": "v4",
  "published": "2010-04-07T20:22:53.000Z",
  "updated": "2010-12-11T00:26:02.000Z",
  "title": "Observation of Single Top Quark Production and Measurement of |Vtb| with CDF",
  "authors": [
    "CDF Collaboration",
    "T. Aaltonen"
  ],
  "comment": "Submitted to Phys. Rev. D",
  "journal": "Phys.Rev.D82:112005,2010",
  "doi": "10.1103/PhysRevD.82.112005",
  "categories": [
    "hep-ex"
  ],
  "abstract": "We report the observation of electroweak single top quark production in 3.2 fb-1 of ppbar collision data collected by the Collider Detector at Fermilab at sqrt{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+0.6-0.5(stat+sys) pb, extract the CKM matrix element value |Vtb|=0.91+0.11-0.11 (stat+sys)+-0.07(theory), and set a lower limit |Vtb|>0.71 at the 95% confidence level, assuming m_t=175 GeVc^2.",
  "revisions": [
    {
      "version": "v4",
      "updated": "2010-12-11T00:26:02.000Z"
    }
  ],
  "analyses": {
    "subjects": [
      "12.15.Ji",
      "12.15.Hh",
      "14.65.Ha",
      "13.85.Qk"
    ],
    "keywords": [
      "quark production",
      "observation",
      "missing transverse energy plus jets",
      "measurement",
      "neural networks"
    ],
    "tags": [
      "journal article"
    ],
    "publication": {
      "publisher": "APS",
      "journal": "Physical Review D",
      "year": 2010,
      "month": "Dec",
      "volume": 82,
      "number": 11,
      "pages": 112005
    },
    "note": {
      "typesetting": "TeX",
      "pages": 0,
      "language": "en",
      "license": "arXiv",
      "status": "editable",
      "inspire": 851277,
      "adsabs": "2010PhRvD..82k2005A"
    }
  }
}