Performance of the CMS Tracker Version V3

This note describes a systematic study of the CMS tracker performance. It aims to evaluate the contribution of different factors, like the spatial resolution of the sensitive elements and the amount of material in the tracker, that affect the track finding efficiency and track parameter resolutions achievable with the CMS tracker. Layout V3 is studied with a detailed simulation of the tracker response, including the simulation of the particle signals induced on the counters' electrodes. The simulation is performed with the CMS detector simulation program CMSIM version 111 ( version 113 for the pixel counters). The tracker performance is evaluated for isolated muon tracks, and for particles in b-jets from top decays at high LHC luminosity.