Abstract
Characteristics of $W$ production are well described by a parton-shower approximation, based solely on the $q\overline{q}\ensuremath{\rightarrow}\mathrm{Wg}$ subprocess with a low-${p}_{T}$ cutoff chosen to reproduce the total cross section through order ${\ensuremath{\alpha}}_{s}$. We apply this approach to $Q\overline{Q}$ production from the 2\ensuremath{\rightarrow} 3-parton subprocesses in $p\overline{p}$ collisions. The results agree with CERN dimuon events for a ${B}^{0}\ensuremath{-}{\overline{B}}^{0}$ mixing parameter $\ensuremath{\epsilon}\ensuremath{\gtrsim}0.1$, which is at the ${e}^{+}{e}^{\ensuremath{-}}$ experimental limit and larger than standard-model expectations.
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