Speaker
Description
The Mu3e experiment is designed to search for the Charged Lepton Flavor Violation (cLFV) through the rare decay μ+ → e+e−e+, targeting a branching ratio sensitivity of 10^-15 using the PSI piE5 beamline in Phase I, scheduled for 2026.
To cope with the exceptionally high muon rate of 10^8/s (equivalent to ~80 Gbps raw data rate), a triggerless, GPU-based online event selection algorithm is implemented on the computing farm to reconstruct tracks and vertices in real time and identify the Mu3e signal candidate, thereby reducing the data rate by two orders of magnitude.
This algorithm consists of four main stages: triplet selection, track reconstruction, vertex selection followed by SciFi selection, together enabling efficient suppression of background events while retaining high signal efficiency. Its feasibility and performance have been successfully demonstrated during the Mu3e commissioning test beam in June 2025.
