First Observation of Electroweak Single Top Quark Production

Details First Observation of Electroweak Single Top Quark Production First Observation of Electroweak Single Top Quark Production

2009-03-05

arxiv.org/abs/0903.0885v3

Phys.Rev.Lett.103:092002,2009

Physics

High Energy Physics

High Energy Physics - Experiment

submitted to Phys. Rev. Lett

Scientific paper

10.1103/PhysRevLett.103.092002

We report the first observation of single top quark production using 3.2 fb^-1 of pbar p collision data with sqrt{s}=1.96 TeV collected by the Collider Detector at Fermilab. The significance of the observed data is 5.0 standard deviations, and the expected sensitivity for standard model production and decay is in excess of 5.9 standard deviations. Assuming m_t=175 GeV/c^2, we measure a cross section of 2.3 +0.6 -0.5 (stat+syst) pb, extract the CKM matrix element value |V_{tb}|=0.91 +-0.11 (stat+syst) 0.07(theory), and set the limit |V_{tb}|>0.71 at the 95% C.L.

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