Tracking and vertexing with a thin CMOS pixel beam telescope

We present results of a study of charged particle track and vertex reconstruction with a beam telescope made of four layers of 50μm-thin CMOS monolithic pixel sensors using the 120 GeV protons at the FNAL Meson Test Beam Facility. We compare our results to the performance requirements of a future e+e- linear collider in terms of particle track extrapolation and vertex reconstruction accuracies.