Search for a Supersymmetric Partner to the Top Quark in Final States with Jets and Missing Transverse Momentum at<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:msqrt><mml:mi>s</mml:mi></mml:msqrt><mml:mo mathvariant="bold">=</mml:mo><mml:mn>7</mml:mn><mml:mtext> </mml:mtext><mml:mtext> </mml:mtext><mml:mi>TeV</mml:mi></mml:math>with the ATLAS Detector

A search for direct pair production of supersymmetric top squarks (${\stackrel{\texttildelow{}}{t}}_{1}$) is presented, assuming the ${\stackrel{\texttildelow{}}{t}}_{1}$ decays into a top quark and the lightest supersymmetric particle, ${\stackrel{\texttildelow{}}{\ensuremath{\chi}}}_{1}^{0}$, and that both top quarks decay to purely hadronic final states. A total of 16 (4) events are observed compared to a predicted standard model background of ${13.5}_{\ensuremath{-}3.6}^{+3.7}({4.4}_{\ensuremath{-}1.3}^{+1.7})$ events in two signal regions based on $\ensuremath{\int}\mathcal{L}dt=4.7\text{ }\text{ }{\mathrm{fb}}^{\ensuremath{-}1}$ of $pp$ collision data taken at $\sqrt{s}=7\text{ }\text{ }\mathrm{TeV}$ with the ATLAS detector at the LHC. An exclusion region in the ${\stackrel{\texttildelow{}}{t}}_{1}$ versus ${\stackrel{\texttildelow{}}{\ensuremath{\chi}}}_{1}^{0}$ mass plane is evaluated: $370<{m}_{{\stackrel{\texttildelow{}}{t}}_{1}}<465\text{ }\text{ }\mathrm{GeV}$ is excluded for ${m}_{{\stackrel{\texttildelow{}}{\ensuremath{\chi}}}_{1}^{0}}\ensuremath{\sim}0\text{ }\text{ }\mathrm{GeV}$ while ${m}_{{\stackrel{\texttildelow{}}{t}}_{1}}=445\text{ }\text{ }\mathrm{GeV}$ is excluded for ${m}_{{\stackrel{\texttildelow{}}{\ensuremath{\chi}}}_{1}^{0}}\ensuremath{\le}50\text{ }\text{ }\mathrm{GeV}$.

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