# Construction and quality assurance of the Belle II Silicon Vertex Detector

## TL;DR

The paper details the construction, precise assembly, and quality assurance processes of the Belle II Silicon Vertex Detector, crucial for accurate vertexing in particle physics experiments at KEK.

## Contribution

It introduces the methods for assembling and ensuring quality of the SVD, emphasizing precise module gluing and electrical testing for the first time.

## Key findings

- Successful assembly of the SVD with high precision
- Implementation of rigorous quality assurance protocols
- Enhanced detector reliability for physics measurements

## Abstract

The Belle II experiment, which is situated at the interaction point of the SuperKEKB $e^+e^{-}$ collider at KEK, Tsukuba, Japan, is expected to collect data corresponding to an integrated luminosity of 50~ab$^{- 1}$. This data set will be sensitive to beyond-the-standard-model physics via precision measurements and searches for very rare decays. At its heart lies a six-layer vertex detector consisting of two layers of pixel detectors (PXD) and four layers of double-sided silicon microstrip detectors (SVD). Precise vertexing as provided by this device is essential for measurements of time-dependent $CP$ violation. Crucial aspects of the SVD assembly are precise alignment, as well as rigorous electrical and geometrical quality assurance. We present an overview of the construction of the SVD, including the precision gluing of SVD component modules and the wire-bonding of various electrical components. We also discuss the electrical and geometrical quality assurance tests.