Tracking and b-tagging performance with an upgraded CMS pixel detector

The luminosity upgrade of the Large Hadron Collider is foreseen to proceed in two phases. An increased luminosity of 2×10 34 cms -1 s -1 , is planned for the first phase of the upgrade, called HL-LHC Phase 1. Tracking and identification of jets originating from b quarks (b-tagging) will continue to be a key element of many physics analyses at the upgraded HL-LHC where much higher pileup can significantly reduce the performance. An upgrade of the CMS pixel detector proposed for the Phase 1 HL-LHC should enable CMS to maintain the current level of b-tagging performance even in the presence of very high pileup. We present simulation studies of the proposed baseline Phase 1 upgrade pixel detector for tracking and b-tagging performance compared to that for the current CMS detector.