Measurement of the<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi>t</mml:mi><mml:mover accent="true"><mml:mi>t</mml:mi><mml:mo>¯</mml:mo></mml:mover></mml:math>production cross section with an<i>in situ</i>calibration of<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi>b</mml:mi></mml:math>-jet identification efficiency

A measurement of the top-quark pair-production cross section in $p\overline{p}$ collisions at $\sqrt{s}=1.96\text{ }\text{ }\mathrm{TeV}$ using data corresponding to an integrated luminosity of $1.12\text{ }\text{ }{\mathrm{fb}}^{\ensuremath{-}1}$ collected with the Collider Detector at Fermilab is presented. Decays of top-quark pairs into the final states $e\ensuremath{\nu}+$ jets and $\ensuremath{\mu}\ensuremath{\nu}+$ jets are selected, and the cross section and the $b$-jet identification efficiency are determined using a new measurement technique which requires agreement between the measured cross sections with exactly one and with multiple identified $b$ quarks from the top-quark decays. Assuming a top-quark mass of $175\text{ }\text{ }\mathrm{GeV}/{c}^{2}$, a cross section of $8.5\ifmmode\pm\else\textpm\fi{}0.6(\mathrm{stat})\ifmmode\pm\else\textpm\fi{}0.7(\mathrm{syst})\mathrm{pb}$ is measured.

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