The upgrade project for the CMS pixel detector

A substantial upgrade of the CMS pixel detector is foreseen to replace the existing detector in early 2017. In particular, the upgrade aims to improve CMS tracking and vertexing for the momentum range below 10GeV/c, the most important region for B-tagging, even in the presence of many overlapping pile-up events. The goal will be achieved by adding one sensitive barrel pixel layer and two forward/backward disks while keeping the total mass of the detector below the current amount within the tracking region. This detector enlargement has consequences for the power provision, for the cooling system and the readout electronics. In this paper most of the changes will be addressed and the anticipated tracking improvements will be given.