Measurement of the Bd0Bd0 flavor oscillation frequency and study of same side flavor tagging of B mesons in pp¯ collisions

Abstract
Bd0Bd0 oscillations are observed in “self-tagged” samples of partially reconstructed B mesons decaying into a lepton and a charmed meson collected in pp¯ collisions at s=1.8TeV. A flavor tagging technique is employed which relies upon the correlation between the flavor of B mesons and the charge of a nearby particle. We measure the flavor oscillation frequency to be Δmd=0.4710.068+0.078±0.034ps1. The tagging method is also demonstrated in exclusive samples of Bu+J/ψK+ and Bd0J/ψK*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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