First studies of T-station alignment with simulated data

Abstract

The alignment of the tracking stations using tracks fitted using standard LHCb track fit is studied. The procedure is presented together with two examples using simulated data. The first scenario presents the alignment of the IT and OT layers using beam-gas events at 450~GeV with no magnetic field. The second scenario is the alignment of the OT layers and IT boxes, layers and ladders with magnet-on data using minimum bias events at nominal energy. The results are validated by refitting J/$\psi$ tracks using the misaligned geometry compared to the re-aligned case as well as the default. It is shown that after alignment the J $\psi$ mass resolution is degraded by at most 3~\%