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produced at the Fermilab Tevatron,
PHYSICAL REVIEW D, vol. 69 no. 1
(January, 2004),
pp. 012002 [Gateway.cgi], [doi] .
Abstract:
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 during the 1992Ð1995
collider run by triggering on the existence of µµ or eµ 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±0.007Ê(stat)±0.011Ê(syst), that
is significantly larger than the world average chi -bar=0.118±0.005.