Impact of misalignments on the analysis of B decays

TL;DR

This paper examines how misalignments in tracking systems affect B decay analysis, finding that small misalignments have negligible impact on reconstruction quality and pattern recognition performance.

Contribution

It provides a comprehensive study of the effects of detector misalignments on B decay analysis, including primary vertex resolution and pattern recognition, with general applicability.

Findings

Misalignments of detector components have little effect on B decay reconstruction.

Pattern recognition algorithms are robust against small misalignments.

Primary vertex resolution remains stable under typical misalignment conditions.

Abstract

This note 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 proven that misalignments of the order 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 $B^0_{(s)} \to h^+h^{'-}$ 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 $B^0_{(s)} \to h^+h^{'-}$ decays.