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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 …