D- and B-meson semi-leptonic decays

Recent results for semi-leptonic decays of $D$ and $B$ mesons at $\beta=6.4$, using the Wilson action, and at $\beta=6.0$, using the Clover action, are reported

The BaBar silicon vertex tracker

The silicon vertex tracker (SVT) for the BaBar experiment at the PEP-II asymmetric B factory is a 5-layers device based on double sided, AC coupled silicon strip detectors. It is read out by a custom IC, the AToM chip, that can simultaniously acquire, digitze and transmit data. The main purpose of the SVT is to accurately measure the decay position of the B mesons that are produced, which is essential for extracting CP asymmetries. Here, we report on the SVT design as well as progress on its fabrication and assembl