Search for<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi>W</mml:mi><mml:mi>W</mml:mi></mml:math>and<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi>W</mml:mi><mml:mi>Z</mml:mi></mml:math>production in lepton plus jets final state at CDF

We present a search for $WW$ and $WZ$ production in final states that contain a charged lepton (electron or muon) and at least two jets, produced in $\sqrt{s}=1.96\text{ }\text{ }\mathrm{TeV}$ $p\overline{p}$ collisions at the Fermilab Tevatron, using data corresponding to $1.2\text{ }\text{ }{\mathrm{fb}}^{\ensuremath{-}1}$ of integrated luminosity collected with the CDF II detector. Diboson production in this decay channel has yet to be observed at hadron colliders due to the large single $W$ plus jets background. An artificial neural network has been developed to increase signal sensitivity, as compared with an event selection based on conventional cuts. We set a 95% confidence level upper limit of ${\ensuremath{\sigma}}_{WW}\ifmmode\times\else\texttimes\fi{}\mathrm{BR}(W\ensuremath{\rightarrow}\ensuremath{\ell}{\ensuremath{\nu}}_{\ensuremath{\ell}},W\ensuremath{\rightarrow}\mathrm{\text{jets}})+{\ensuremath{\sigma}}_{WZ}\ifmmode\times\else\texttimes\fi{}\mathrm{BR}(W\ensuremath{\rightarrow}\ensuremath{\ell}{\ensuremath{\nu}}_{\ensuremath{\ell}},Z\ensuremath{\rightarrow}\mathrm{\text{jets}})<2.88\text{ }\text{ }\mathrm{pb}$, which is consistent with the standard model next-to-leading-order cross section calculation for this decay channel of $2.09\ifmmode\pm\else\textpm\fi{}0.12\text{ }\text{ }\mathrm{pb}$.

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