1. Dileptons: an inclusive approach for B0 mixing
B Flavor
=> sign of the direct lepton
Inclusive approach
=> large BR (~4%)
Mixture of B0 and B
=> Fraction R fitted l-
=0.56 B0
(4S)
<z> = 250 µm l+ B0
Fit of m and
the fraction R
2 additional parameters
in the fit to take into account the fraction of mistagged events (cascade leptons).

2. Dilepton Mixing: Results
With 7.7 fb-1 on-resonance
and 1.1 fb-1 off-resonance data
Dmd = (0.507 ± 0.015(stat)
± (syst))  ps-1
Preliminary
Very Preliminary
Dilepton sub-sample enriched in B0 with partial reconstruction
of B0  D*l 