VELO Misalignment Studies
Impact of misalignments on the analysis of B decaysThis study investigates the effects of a misaligned tracking system on the analysis of B decays. Misalignment effects of both the vertex locator and the inner and outer T-stations have been studied. z -scaling effects of the vertex locator are also considered. It is shown that misalignments of the order of one third of the detector single-hit resolutions have little or negligible effects on the quality of the reconstruction and of the analysis of B decays. The studies were performed with a sample of B0(s) ->h+h'- decays, but the impact of misalignments on the performance of the pattern recognition algorithms and on the primary vertex resolutions, assessed for the first time, are rather general and not restricted to B0(s)h+h'- decays.
Study of the impact of VELO misalignments on the LHCb tracking and L1 trigger performance.A study has been conducted to investigate the effect of VELO misalignments on the LHCb tracking and Level 1 trigger reconstruction. The aim of this study is to determine the level of precision required during assembly of the VELO and the determination of the position of the VELO after insertion.