Track and vertex reconstruction with timing in CMS for the HL-LHC phase

Abstract The upgrade of the CMS experiment for the High-Luminosity LHC (HL-LHC) will introduce unprecedented timing capabilities for charged particles through the MIP Timing Detector (MTD). As a key component of the Phase-II upgrade, the MTD will measure the arrival time of minimum ionizing particles with a resolution of O(30) ps, covering the pseudorapidity region up to | η | = 3. This additional time information enables the reconstruction of interaction vertices in four dimensions (3 spatial + time), representing a major advancement in pileup mitigation and particle identification (PID) in the dense collision environment expected at the HL-LHC. This contribution presents recent developments in tracking and vertexing algorithms that exploit the MTD timing information, along with an assessment of the uncertainties in the time-of-flight estimation. The computational performance and the physics performance, in terms of vertex time resolution, reconstruction efficiency, pileup rejection and particle identification, will be discussed.