B cross section measurements in lD

We present a new measurement of the B meson production cross section using $80 pb^-1$ of p-pbar collisions at $\sqrt{s}=1.96$ TeV with the CDF detector. Semileptonic B mesons decay modes such as $mu^+D^{*-}$ and $mu^+D0$ are used to isolate a clean sample of semileptonic B decays. The data sample utilized in this analysis was accumulated using a semileptonic trigger which takes advantage of CDF's ability to trigger on displaced tracks.