Erlangen 2026 – scientific programme
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T: Fachverband Teilchenphysik
T 5: Methods in Particle Physics I
T 5.4: Talk
Monday, March 16, 2026, 17:00–17:15, KH 00.020
Tracking Performance Studies for the Mu3e Experiment — •Elija Engelhardt, Tamasi Kar, and André Schöning for the Mu3e collaboration — Physikalisches Institut, Universität Heidelberg, Germany
The Mu3e experiment aims to find the charged lepton flavour violating decay µ+→ e+e−e+ at the Paul Scherrer Institute (PSI). Phase 1 of the experiment will reach a single event sensitivity of 2× 10−15 on the branching ratio, and Phase 2 aims for a sensitivity down to 10−16[1]. In order to reach this level of sensitivity, a high muon stopping rate (2 GHz) and a large track reconstruction efficiency are required. The tracking detector comprises of four pixel detector layers based on the HV-MAPS technology for precise position measurements, scintillating fibres, and scintillating tiles for precise timing. The tracking algorithm used is based on the General Triplet Track Fit (GTTF) [2].
The tracking efficiency, purity, and various parameter resolutions are studied and improved using Monte Carlo simulations and data taken during the June 2025 commissioning run. The track reconstruction efficiency and purity are defined with simulation truth as reference. Various track parameter cuts are investigated to balance fake rate and efficiency. Results from the tracking performance optimisation studies will be presented.
[1] The Mu3e Collaboration. Technical design of the phase I Mu3e experiment. doi: 10.1016/j.nima.2021.165679
[2] A. Schöning. A general track fit based on triplets. doi: 0.1016/j.nima.2025.170391
Keywords: Reconstruction; Tracking Performance; Mu3e; Tracking Efficiency