Measurement of the Single Top Quark Production Cross Section and |Vtb| in Events with One Charged Lepton, Large Missing Transverse Energy, and Jets at CDF

Le résumé fourni par la source

We report a measurement of single top quark production in proton-antiproton collisions at a center-of-mass energy of $\sqrt{s}=1.96\text{ }\text{ }\mathrm{TeV}$ using a data set corresponding to $7.5\text{ }\text{ }{\mathrm{fb}}^{\ensuremath{-}1}$ of integrated luminosity collected by the Collider Detector at Fermilab. We select events consistent with the single top quark decay process $t\ensuremath{\rightarrow}Wb\ensuremath{\rightarrow}\ensuremath{\ell}\ensuremath{\nu}b$ by requiring the presence of an electron or muon, a large imbalance of transverse momentum indicating the presence of a neutrino, and two or three jets including at least one originating from a bottom quark. An artificial neural network is used to discriminate the signal from backgrounds. We measure a single top quark production cross section of $3.0{4}_{\ensuremath{-}0.53}^{+0.57}\text{ }\text{ }\mathrm{pb}$ and set a lower limit on the magnitude of the coupling between the top quark and bottom quark $|{V}_{\mathit{t}\mathit{b}}|>0.78$ at the 95% credibility level.

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