Erlangen 2026 – scientific programme

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T: Fachverband Teilchenphysik

T 70: Electronics, Trigger, DAQ III

T 70.4: Talk

Thursday, March 19, 2026, 17:00–17:15, KH 00.023

Online Track Reconstruction for the Mu3e Experiment — •Haris Avudaiyappan Murugan for the Mu3e collaboration — Institute of Nuclear Physics, Johannes Gutenberg University of Mainz, Germany

The Mu3e experiment aims to find or exclude the lepton flavour violating decay of a positive muon to two positrons and an electron with a branching fraction sensitivity of 10^-16. To observe such a rare event, we require a tracking detector from custom-designed High-Voltage Monolithic Active Pixel Sensors (HV-MAPS) together with timing detectors made from scintillating fibres and tiles for the experiment. The detector will be streaming up to 1 TBit/s of data to the filter farm composed of graphics processing units (GPUs), in which the data rate is reduced to less than 100 MB/s and this filtered data is stored for later analysis. This reduction can be achieved by selecting potential signal events with two positrons and one electron originating from a single vertex through online track and vertex reconstruction on the GPU. During the 2025 beam run we were able to perform/test online tracking and selection of events using the filter farm.

Keywords: DAQ; GPU; Filter Farm; Track Reconstruction; Online Event Selection