Erlangen 2026 – wissenschaftliches Programm
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T: Fachverband Teilchenphysik
T 26: Methods in Particle Physics II
T 26.5: Vortrag
Dienstag, 17. März 2026, 17:15–17:30, KH 00.020
Track Based Software Alignment Using the General Triplet Track Fit — •David Fritz, Tamasi Kar, and André Schöning for the Mu3e collaboration — Physikalisches Institut, Universität Heidelberg, Germany
The Mu3e experiment aims to observe the charged-lepton-flavour-violating decay µ+ → e+ e− e+ at the Paul Scherrer Institut with a signal sensitivity of 1 in 1016 muon decays. To reach the physics goals and tracking performance of Mu3e, precise alignment of the tracking detector is crucial. Whereas optical surveillance systems provide an initial reference, track-based software alignment is required to achieve the resolution required.
A new alignment procedure based on the General Triplet Track Fit (GTTF) [1] enables the simultaneous determination of track and alignment parameters. The GTTF is a non-iterative triplet-based track fit that incorporates hit uncertainties and multiple scattering. It is highly parallelizable and suitable for implementation on, for example, GPUs or FPGAs.
This talk introduces the Mu3e experiment and places the GTTF-based alignment in the context of standard track based alignment approaches. Results from simulation studies and first applications to Mu3e commissioning data collected in June 2025 are presented, thereby demonstrating the potential of the GTTF-based alignment for the experiment.
[1] A. Schöning, 2025, A General Track Fit based on Triplets, https://doi.org/10.1016/j.nima.2025.170391
Keywords: Alignment; Reconstruction; Triplet; Multiple Scattering; Hit Uncertainties