Measurement of the $B$ Meson Differential Cross Section, $d\ddot{I}ƒ/d{p}_T$, in $p\bar{p}$ Collisions at $\sqrt{s}=1.8$ TeV

Abstract

This paper presents the first direct measurement of the $B$ meson differential cross section, $d\ddot{I}ƒ/d{p}_T$, in $p\bar{p}$ collisions at $\sqrt{s}=1.8$ TeV using a sample of $19.3\pm 0.7$ pb${}^{-1}$ accumulated by the Collider Detector at Fermilab (CDF). The cross section is measured in the central rapidity region $|y|<1$ for $p_T(B)>6.0$ GeV/$c$ by fully reconstructing the $B$ meson decays $B^{+}\to J/\ddot{I}ˆK^{+}$ and $B^0\to J/\ddot{I}ˆK^{\ast 0}(892)$, where $J/\ddot{I}ˆ\to \hat{I}{¼}^{+}\hat{I}{¼}^{-}$ and $K^{\ast 0}\to K^{+}\ddot{I}{€}^{-}$. A comparison is made to the theoretical QCD prediction calculated at next-to-leading order.

14 pages. Submitted to Phys. Rev. Lett. The postscript file is at http://www-cdf.fnal.gov/physics/pub95/cdf2893_bexcl_xsection.ps