Observation of Single Top Quark Production with the D0 Detector

Details Observation of Single Top Quark Production with the D0 Detector Observation of Single Top Quark Production with the D0 Detector

2009-08-31

arxiv.org/abs/0908.4553v1

Physics

High Energy Physics

High Energy Physics - Experiment

4 pages, 8 figures, proceedings for 2009 Europhysics Conference On High Energy Physics (HEP 2009)

Scientific paper

We report on the observation of single top quark production by the D0 collaboration using a dataset of 2.3 fb^-1 collected at the Fermilab Tevatron ppbar collider. Several multivariate techniques are combined to separate the single top signal from backgrounds. The measured single top cross section is 3.94+-0.88pb. The probability to measure a cross section at this value or higher in the absence of signal is 2.9*10^-7, corresponding to a 5.0 standard deviation significance for the presence of signal. The lower limit at the 95% C.L. on the CKM matrix element Vtb is |Vtb|>0.78. A separate measurement of the t-channel cross section gives 3.14 +0.94 -0.80 pb.

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