Measurement of theB0−B¯0Oscillation Frequency Usingπ−BMeson Charge-Flavor Correlations inpp¯Collisions ats=1.8TeV

We present a measurement of the $B^0\leftrightarrow {\overline{B}}^0$ oscillation frequency using a flavor tagging method based on correlations of $B$ meson flavor with the charge of other particles produced in $p\overline{p}$ collisions at $\sqrt{s}=1.8\mathrm{TeV}$. Such correlations are expected to arise from $b$ quark hadronization and from $B^{**}$ decays. We partially reconstruct $B$ mesons using the semileptonic decays $B^0\to l^{+}{D}^{\left(*\right)-}X$ and $B^{+}\to l^{+}{\overline{D}}^{0}X$. From the oscillation frequency, we obtain the mass difference between the two $B^0$ mass eigenstates, $\Delta m_d{=0.471\mathrm{}}_{-0.068\mathrm{}}^{+0.078\mathrm{}}\left(\mathrm{stat}\right)\pm 0.034\left(\mathrm{syst}\right)ħ{\mathrm{ps}}^{-1\mathrm{}}$, and measure the efficiency and purity of this flavor tagging method for both charged and neutral $B$ mesons.