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).

Dilepton Mixing: Results With 7.7 fb-1 on-resonance and 1.1 fb-1 off-resonance data Dmd = (0.507 ± 0.015(stat) ± 0.022 (syst))  ps-1 Preliminary Very Preliminary Dilepton sub-sample enriched in B0 with partial reconstruction of B0  D*l 