We report a measurement of the single top quark production
cross section in 2.2 fb-1 of p anti-p collision data collected by the
Collider Detector at Fermilab at s**(1/2) ñ.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)|
ð.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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Updated: Tuesday, 2008 December 23 12:18:04 CST automatically from input from carol picciolo