Effects of a degraded tracker inner barrel in the CMS tracking reconstruction

This thesis reports the impact of the first two Tracker Inner Barrel’s layers degradation on the CMS detector tracking efficiency and how the new tracking detector and geometry proposed for the Phase 1 upgrade will improve this efficiency. To make this study, we measured the tracking efficiency and the track fake rate, considering the Tracker Inner Barrel degradation, using tt¯ Monte Carlo samples for the current and for the Phase 1 geometries in scenarios such as zero pileup and a scenario with average pileup of fifty interactions per crossing. In this second scenario, which corresponds to the upgrade Phase 1 LHC luminosity (2×10${^34}$ cm${^-2}$s${^-1}$, we have included the pixel detector inefficiency simulation due to data loss. From these results, we have concluded that with the new geometry proposed in the Phase 1 it will be possible to recover the tracking efficiency loss and reduced the track fake rate produced by the impact of the super LHC (SLHC) luminosity.