Impact of Tracker Misalignment on the CMS b-Tagging Performance

The expected performance of b-tagging algorithms is studied for various scenarios in which realistic detector effects corresponding to the first data taking phase of the experiment are taken into account, for example silicon tracker misalignment corresponding to first collisions, as well as to 10 and $100 \rm\ pb^{-1}$ of integrated luminosity. A simple secondary vertex algorithm is investigated, based purely on the presence of a reconstructed secondary vertex, that is robust with respect to misalignment and has a light flavor mistagging rate of below 3\% for a b-tagging efficiency of 35\% for the expected startup tracker misalignment conditions.