Measurement of the<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:msup><mml:mi>B</mml:mi><mml:mo>+</mml:mo></mml:msup></mml:math>production cross section 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>1960</mml:mn><mml:mtext> </mml:mtext><mml:mtext> </mml:mtext><mml:mi>GeV</mml:mi></mml:math>

Abstract

We present a new measurement of the ${B}^{+}$ meson differential cross section $d\ensuremath{\sigma}/d{p}_{T}$ at $\sqrt{s}=1960\text{ }\text{ }\mathrm{GeV}$. The data correspond to an integrated luminosity of $739\text{ }\text{ }{\mathrm{pb}}^{\ensuremath{-}1}$ collected with the upgraded CDF detector (CDF II) at the Fermilab Tevatron collider. ${B}^{+}$ candidates are reconstructed through the decay ${B}^{+}\ensuremath{\rightarrow}J/\ensuremath{\psi}{K}^{+}$, with $J/\ensuremath{\psi}\ensuremath{\rightarrow}{\ensuremath{\mu}}^{+}{\ensuremath{\mu}}^{\ensuremath{-}}$. The integrated cross section for producing ${B}^{+}$ mesons with ${p}_{T}\ensuremath{\ge}6\text{ }\text{ }\mathrm{GeV}/c$ and $|y|\ensuremath{\le}1$ is measured to be $2.78\ifmmode\pm\else\textpm\fi{}0.24\text{ }\text{ }\ensuremath{\mu}\mathrm{b}$.