A Study of $B^0$ - $\bar{B}^0$ mixing using semileptonic decays of $B$ hadrons produced from $Z^0$

The B0−View the MathMLsource0 mixing was studied by using about 250 000 hadronic decays of the Z0, collected with the DELPHIdetector at LEP. With 1665 dilepton events, the probability for a b quark to become a View the MathMLsource before decaying was found to be χ = 0.121−0.040+0.044 ± 0.017. The semileptonic branching ratio of the b was measured from the dilepton and single lepton events and found to be Br( b→ l) = (10.0 ± 0.7 ± 0.7)%.