Measurement of the Bd0−Bd0 flavor oscillation frequency and study of same side flavor tagging of B mesons in pp¯ collisions

Authors:
  • FAF. Abe
    F. Abe
  • HAH. Akimoto
    H. Akimoto
  • AAA. Akopian
    A. Akopian
  • MAM. G. Albrow
    M. G. Albrow
  • AAA. Amadon
    A. Amadon
  • SAS. R. Amendolia
    S. R. Amendolia
  • DAD. Amidei
    D. Amidei
  • JAJ. Antos
    J. Antos
  • SAS. Aota
    S. Aota
  • GAG. Apollinari
    G. Apollinari
  • TAT. Arisawa
    T. Arisawa
  • TAT. Asakawa
    T. Asakawa

Abstract
Bd0−Bd0 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=0.471−0.068+0.078±0.034ps−1. The tagging method is also demonstrated in exclusive samples of Bu+→J/ψK+ and Bd0→J/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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