Measurement of the Single Top Quark Production Cross Section at CDF

Details Measurement of the Single Top Quark Production Cross Section at CDF Measurement of the Single Top Quark Production Cross Section at CDF

2008-09-15

arxiv.org/abs/0809.2581v2

Phys.Rev.Lett.101:252001,2008

Physics

High Energy Physics

High Energy Physics - Experiment

After referee comments/new draft. Phys. Rev. Lett. 7 pages, two figures

Scientific paper

10.1103/PhysRevLett.101.252001

We report a measurement of the single top quark production cross section in 2.2 ~fb-1 of p-pbar collision data collected by the Collider Detector at Fermilab at sqrt{s}=1.96 TeV. Candidate events are classified as signal-like by three parallel analyses which use likelihood, matrix element, and neural network discriminants. These results are combined in order to improve the sensitivity. We observe a signal consistent with the standard model prediction, but inconsistent with the background-only model by 3.7 standard deviations with a median expected sensitivity of 4.9 standard deviations. We measure a cross section of 2.2 +0.7 -0.6(stat+sys) pb, extract the CKM matrix element value |V_{tb}|=0.88 +0.13 -0.12 (stat+sys) +- 0.07(theory), and set the limit |V_{tb}|>0.66 at the 95% C.L.

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