Measurement of the $B^{+}$ Total Cross Section and $B^{+}$ Differential Cross Section $d\sigma \mathrm{/}d{p}_T$ in $p\bar{p}$ Collisions at $\sqrt{s}=1.8$ TeV

We present measurements of the B+ meson total cross section and differential cross section $d\sigma \mathrm{/}d{p}_T$. The measurements use a $98\pm 4$ pb^{-1} sample of $p\bar{p}$ collisions at $\sqrt{s}=1.8$ TeV collected by the CDF detector. Charged $B$ meson candidates are reconstructed through the decay $B^{\pm} \to J/\psi K^{\pm}$with$J/\psi\to \mu^+ \mu^-$. The total cross section, measured in the central rapidity region $\mathrm{\mid }y\mathrm{\mid }<1.0$ for $p_T(B)>6.0$ GeV/$c$, is $3.6 \pm 0.6 ({\rm stat} \oplus {\rm syst)} \mu$b. The measured differential cross section is substantially larger than typical QCD predictions calculated to next-to-leading order.