We have measured the number of like-sign (LS) and opposite-sign
(OS) lepton pairs arising from double semileptonic decays of b and
b-bar-hadrons, pair-produced at the Fermilab Tevatron collider. The data
samples were collected with the Collider Detector at Fermilab (CDF) during
the 1992-1995 collider run by triggering on the existence of mu mu or e mu
candidates in an event. The observed ratio of LS to OS dileptons leads to a
measurement of the average time-integrated mixing probability of all
produced b-flavored hadrons which decay weakly, chi-bar = 0.152 +/- 0.007
(stat.) +/- 0.011 (syst.), that is significantly larger than the world
average chi-bar = 0.118 +/- 0.005.
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Updated: Friday, 2004 February 06 12:21:35 CST automatically from input from "Carol I. Picciolo"