Observation of (pi) - B meson charge-flavor correlations and measurement of time dependent B(sup 0) Bbar(sup 0) mixing in p(bar p) collisions

摘要

We present evidence for charge correlations of (ital B) mesons with charged particles produced in (ital p(anti p)) Collisions at 1.8 TeV. Such correlations are expected to arise from pious produced in the fragmentation chain and from (ital B)(sup **) decays. We measure the efficiency and purity of this flavor tagging method for both charged and neutral (ital B) mesons. We apply these correlations to (ital B) mesons reconstructed in 110 pb(sup -1) of data collected with the CDF detector at the Fermilab Tevatron Collider. (ital B) mesons are either partially reconstructed, using the semileptonic decays (ital B)(sup 0) (yields) (ital l)(sup +)(ital D)(sup (*)-)(ital X) and (ital B)(sup +) (yields) (ital l)(sup +)(ital (anti D)X), or fully reconstructed, using the decay modes (ital B)(sup 0) (yields) (ital J/(Psi)K(sup *0)) and (ital B)(sup +) (yields) (ital J/(Psi)K(sup +)). Application of this new flavor tagging method to neutral (ital B) mesons yields a measurement of the frequency of the oscillation (ital B)(sup 0) (yields) (ital (anti B))(sup 0). We obtain (Delta)(ital m(sub d)) = 0.446 (+-) 0.057(sup +0.034)(sub -0.031).