Speaker
Description
The Mu3e experiment at the Paul Scherrer Institut aims to observe the charged-lepton-flavour- violating decay μ⁺ → e⁺e⁻e⁺ 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. While optical survey systems provide an initial geometry, track-based software alignment is essential to achieve the required resolution.
A novel SW-based 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 track fit based on hit triplets that incorporates position uncertainties, multiple scattering and energy loss, and is well suited for parallelized implementations on GPUs or FPGAs.
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 Mu3e experiment.
[1] A. Schöning, 2025, A General Track Fit based on Triplets, https://doi.org/10.1016/j.nima.2025.170391