Search for Heavy Bottomlike Quarks Decaying to an Electron or Muon and Jets in<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi>p</mml:mi><mml:mover accent="true"><mml:mi>p</mml:mi><mml:mo>¯</mml:mo></mml:mover></mml:math>Collisions 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>=</mml:mo><mml:mn>1.96</mml:mn><mml:mtext> </mml:mtext><mml:mtext> </mml:mtext><mml:mi>TeV</mml:mi></mml:math>

We report the most sensitive direct search for pair production of fourth-generation bottomlike chiral quarks (${b}^{\ensuremath{'}}$) each decaying promptly to $tW$. We search for an excess of events with an electron or muon, at least five jets (one identified as due to a $b$ or $c$ quark), and an imbalance of transverse momentum by using data from $p\overline{p}$ collisions collected by the CDF II detector at Fermilab with an integrated luminosity of $4.8\text{ }\text{ }{\mathrm{fb}}^{\ensuremath{-}1}$. We observe events consistent with background expectation, calculate upper limits on the ${b}^{\ensuremath{'}}$ pair-production cross section (${\ensuremath{\sigma}}_{b{\overline{b}}^{\ensuremath{'}}}\ensuremath{\lesssim}30\text{ }\text{ }\mathrm{fb}$ for ${m}_{{b}^{\ensuremath{'}}}&gt;375\text{ }\text{ }\mathrm{GeV}/{c}^{2}$), and exclude ${m}_{{b}^{\ensuremath{'}}}&lt;372\text{ }\text{ }\mathrm{GeV}/{c}^{2}$ at 95% confidence level assuming a 100% branching ratio of ${b}^{\ensuremath{'}}$ to $tW$.

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