SVD activities

The Silicon Vertex Detector (SVD) is one of the main detectors of Belle II. The SVD works with the PiXel Detector (PXD) to determine precise decay vertices and performs low-momentum track reconstruction.

Fig1: Longitudinal view of the SVD and PXD.

The Silicon Vertex detector fulfils two major tasks for the experiment:extrapolates tracks toward the interaction point for precision tracking and vertexing measurements and provides standalone tracking for low-momentum charged particles that cannot be measured by the central drift chamber. It also contributes to particle ID with dE/dx measurement. It consists of four layers of double-sided silicon strip sensors located at radius between 29 and 135 mm. This document gives a good presentation of the SVD.

Fig2: Estimation of the SVD resolution using di-muons events.

Our team is involved in the estimation of the cluster position resolution using two methods. The first one is based on residuals of the cluster position with respect to an unbiased track extrapolation using di-muons events (method illustrated on Figure 1). The second one is based on the overlap method used by the CMS collaboration, illustrated on Figure 3.

Fig3: Estimation of the SVD resolution using the overlap method.
by Giuliana Rizzo on behalf of the Belle II SVD Collaboration at VERTEX 2020
October 4th, 2020
Public review talk.