Measurement of the cluster position resolution of the Belle II Silicon Vertex Detector

TL;DR

This paper evaluates the position resolution of the Belle II Silicon Vertex Detector using data-driven methods, crucial for accurate track reconstruction in high-luminosity collider environments.

Contribution

It introduces and discusses multiple data-based methods for estimating the cluster position resolution of the SVD, enhancing track reconstruction accuracy.

Findings

The SVD operates reliably with high efficiency in high-background conditions.

Several methods for estimating cluster position resolution are presented and compared.

Results improve the understanding of the detector's performance for precise physics measurements.

Abstract

The Silicon Vertex Detector (SVD), with its four double-sided silicon strip sensor layers, is one of the two vertex sub-detectors of Belle II operating at SuperKEKB collider (KEK, Japan). Since 2019 and the start of the data taking, the SVD has demonstrated a reliable and highly efficient operation, even running in an environment with harsh beam backgrounds that are induced by the world's highest instantaneous luminosity. In order to provide the best quality track reconstruction with an efficient pattern recognition and track fit, and to correctly propagate the uncertainty on the hit's position to the track parameters, it is crucial to precisely estimate the resolution of the cluster position measurement. Several methods for estimating the position resolution directly from the data will be discussed.