We report a measurement of the single-top-quark production cross section in 2.2 fb(-1) of p (p) over bar collision data collected by the Collider Detector at Fermilab at root 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(-0.6)(+0.7)(stat + syst)) pb, extract the Cabibbo-Kobayashi-Maskawa matrix-element value |V(tb)| 0.88(-0.12)(+0.13)(stat + syst) +/- 0.07(theory), and set the limit |V(tb)| > 0.66 at the 95% C.L.
Measurement of the Single-Top-Quark Production Cross Section at CDF
CIOCCI, MARIA AGNESE;DONATI, SIMONE;PUNZI, GIOVANNI;
2008-01-01
Abstract
We report a measurement of the single-top-quark production cross section in 2.2 fb(-1) of p (p) over bar collision data collected by the Collider Detector at Fermilab at root 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(-0.6)(+0.7)(stat + syst)) pb, extract the Cabibbo-Kobayashi-Maskawa matrix-element value |V(tb)| 0.88(-0.12)(+0.13)(stat + syst) +/- 0.07(theory), and set the limit |V(tb)| > 0.66 at the 95% C.L.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.