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This note presents a search for the production of supersymmetric (SUSY) stop quark pairs in events with a |
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single isolated lepton, several jets, missing transverse energy, and large transverse mass. We use the full |
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2012 data sample, corresponding to an integrated luminosity of \lumi. |
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single isolated lepton, several jets, missing transverse energy, and large transverse mass. We use a |
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data sample corresponding to an integrated luminosity of \lumi. |
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This search is of theoretical interest because of the critical role played |
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by the stop quark in solving the hierarchy problem in SUSY models. This solution requires that the stop quark |
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be light, less than a few hundred GeV and hence within reach for direct pair production. We focus on two decay modes |
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of events with large \mt. The dominant background in this kinematic region is dilepton \ttbar\ where one of the |
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leptons is not identified, since the presence of two neutrinos from leptonically-decaying W bosons allows the |
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\mt\ to exceed $M_W$. Backgrounds are estimated from Monte Carlo (MC) simulation, with careful validation |
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and determination of scale factors and corresponding uncertainties based on data control samples. |
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and determination of scale factors (where necessary) and corresponding uncertainties based on data control samples. |
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The expected stop quark pair production cross section (see Fig.~\ref{fig:stopxsec}) varies between 18 pb |
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for $m_{\tilde{t}}=200$~GeV and 0.09 pb for $m_{\tilde{t}}=500$~GeV\cite{xsec0}. |
