Tracker alignment performance in 2021

An accurate determination of the geometry of the inner tracking system of the CMS experiment, which comprises Silicon Pixel and Silicon Strip detectors, is of vital importance for a precise measurement of the momentum of charged particles and reconstruction of primary and secondary vertices. The process of determining the geometry parameters of the inner tracking system is called tracker alignment. During the LHC Long Shutdown 2 (2018-2021) the CMS Barrel Pixel detector was disassembled and its innermost layer was fully replaced. In this report, we compare the performance of the three tracker geometries derived with the cosmic rays and pp collision data collected in 2021: (1) first tracker detector alignment after pixel installation with cosmic rays collected at 0T magnetic field (2) alignment with cosmic rays collected at 3.8 T and (3) alignment with cosmic rays and pp collision at center of mass energy of 900 GeV.