Technical design of the phase I Mu3e experiment

K. Arndt, H. Augustin, P. Baesso, N. Berger, F. Berg, C. Betancourt, D. Bortoletto, A. Bravar, K. Briggl, D. vom Bruch, A. Buonaura, F. Cadoux (+94 others)
2021 Nuclear instruments & methods in physics research / A 1014  
The Mu3e experiment aims to find or exclude the lepton flavour violating decay $μ → eee$ at branching fractions above 10$^{−16}$. A first phase of the experiment using an existing beamline at the Paul Scherrer Institute (PSI) is designed to reach a single event sensitivity of 2⋅10$^{−15}$. We present an overview of all aspects of the technical design and expected performance of the phase I Mu3e detector. The high rate of up to 108 muon decays per second and the low momenta of the decay
more » ... and positrons pose a unique set of challenges, which we tackle using an ultra thin tracking detector based on high-voltage monolithic active pixel sensors combined with scintillating fibres and tiles for precise timing measurements.
doi:10.3204/pubdb-2022-00370 fatcat:b3cwkavgyndzlbqrobnn6dykwa