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Search for a Fourth-Generation Quark More Massive than the<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msup><mml:mrow><mml:mi mathvariant="italic">Z</mml:mi></mml:mrow><mml:mrow><mml:mn>0</mml:mn></mml:mrow></mml:msup></mml:mrow></mml:math>Boson in<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi mathvariant="italic">p</mml:mi><mml:mrow><mml:mrow><mml:mover><mml:mrow><mml:mi mathvariant="italic">p</mml:mi></mml:mrow><…
We present the results of a search for pair production of a fourth-generation charge $\ensuremath{-}\frac{1}{3}$ quark $({b}^{\ensuremath{'}})$ in $\sqrt{s}\phantom{\rule{0ex}{0ex}}=\phantom{\rule{0ex}{0ex}}1.8\mathrm{TeV}$ $p\overline{p}$ collisions using $88{\mathrm{pb}}^{\ensuremath{-}1}$ of data obtained with the Collider Detector at Fermilab. We assume that both quarks decay via the flavor-changing neutral current process ${b}^{\ensuremath{'}}\ensuremath{\rightarrow}{\mathrm{bZ}}^{0}$ and that the ${b}^{\ensuremath{'}}$ mass …