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The new Belle II experiment at the asymmetric $e^+ e^-$ accelerator SuperKEKBat KEK in Japan is designed to deliver a peak luminosity of$8\times10^{35}\text{cm}^{-2}\text{s}^{-1}$. To perform high-precision trackreconstruction, e.g. for measurements of time-dependent CP-violating decays andsecondary vertices, the Belle II detector is equipped with a highly segmentedpixel detector (PXD). The high instantaneous luminosity and short bunchcrossing times result in a large stream of data in the PXD, which needs to besignificantly reduced for offline storage. The data reduction is performedusing an FPGA-based Data Acquisition Tracking and Concentrator Online Node(DATCON), which uses information from the Belle II silicon strip vertexdetector (SVD) surrounding the PXD to carry out online track reconstruction,extrapolation to the PXD, and Region of Interest (ROI) determination on thePXD. The data stream is reduced by a factor of ten with an ROI findingefficiency of >90% for PXD hits inside the ROI down to 50 MeV in $p_\text{T}$of the stable particles. We will present the current status of theimplementation of the track reconstruction using Hough transformations, and theresults obtained for simulated \Upsilon(4S) $\rightarrow \, B\bar{B}$ events.

Online Data Reduction for the Belle II Experiment using DATCON