Zihan Wang

02 November 2023

Abstract: The Belle II experiment located at KEK, Japan takes data from asymmetric e+e- collision provided by the SuperKEKB accelerator. The Silicon Vertex Detector (SVD), which is part of the Belle II Vertex Detector (VXD), has been operating smoothly and reliably since the start of data taking from March 2019. In this article, we report on the performance of the SVD in terms of the large signal-to-noise ratio, the good hit position resolution as well as the good hit-time resolution. New algorithms based on hit-time information are under development to improve robustness of tracking performance against high background environment. Background situation on the SVD has been constantly monitored and no degradation in performance is observed so far. To investigate the SVD performance at high luminosity runs in the future, simulation as well as irradiation campaign are launched and their results are summarized is this article. During the Long Shutdown 1 (LS1) of the Belle~II experiment which starts from June 2022, the new two-layer DEPFET pixel detector (PXD) located inside the SVD is installed and the new VXD commissioning phase began to get ready for beam operation starting in early 2024.

Keyword(s): Silicon strip detector ; Vertex detector ; Tracking detector ; Belle II