Preliminary BABAR results on B0 mixing with dileptons and on lifetime with partially reconstructed B0 decays

Abstract

With an integrated luminosity of 7.7 fb-1 collected on resonance by BABAR at the PEP-II asymmetric B Factory, we measure the difference in mass between the neutral B eigenstates, Delta(m_d), to be (0.507+/-0.015+/-0.022)x 10^{12} hbar s^{-1} with dileptons events and present preliminary results for the B^0 lifetime, tau(B^0) = 1.55+/-0.05+/-0.07 ps and tau(B^0) = 1.62+/-0.02+/-0.09 ps obtained from partial reconstruction of the two B^0 decay processes respectively B^0-->D^{*-}pi^+ and B^0-->D^{*-} l^+ nu_l.

arXiv comment4 pages, 2 postscript figures, contributed paper to ICHEP2000