Physics – High Energy Physics – High Energy Physics - Experiment
Scientific paper
1998-06-25
Phys.Rev.D59:032001,1999
Physics
High Energy Physics
High Energy Physics - Experiment
Scientific paper
10.1103/PhysRevD.59.032001
$B^0_d$-$\bar{B}{}^0_d$ oscillations are observed in ``self-tagged'' samples of partially reconstructed $B$ mesons decaying into a lepton and a charmed meson collected in $p\bar p$ collisions at $\sqrt{s} = 1.8$ TeV. A flavor tagging technique is employed which relies upon the correlation between the flavor of $B$ mesons and the charge of nearby particles. We measure the flavor oscillation frequency to be $\Delta m_d = 0.471 ^{+0.078}_{-0.068} \pm 0.034 ps^{-1}$. The tagging method is also demonstrated in exclusive samples of $B^+_u \to J/\psi K^+$ and $B^0_d \to J/\psi K^{*0}(892)$, where similar flavor-charge correlations are observed. The tagging characteristics of the various samples are compared with each other, and with Monte Carlo simulations.
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