Observation of Single Top Quark Production and Measurement of || with CDF
Collaboration
62 pages
Published in:
- Phys.Rev.D 82 (2010) 112005
e-Print:
- 1004.1181 [hep-ex]
Report number:
- FERMILAB-PUB-10-063-E
Experiments:
Citations per year
Abstract: (arXiv)
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.Note:
- Submitted to Phys. Rev. D
- 12.15.Ji
- 12.15.Hh
- 14.65.Ha
- 13.85.Qk
- OSG : CDF
- anti-p p: interaction
- truth: single production
- transverse energy: missing-energy
- final state: ((n)jet lepton)
- final state: ((n)jet)
References(104)
Figures(124)